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The Department of Defense’s (DOD’s) FY2009, FY2008, and FY2007 budgets proposed to 
cancel the F136 alternate engine for the F-35 Joint Strike Fighter (JSF), a program that was 
initiated by Congress in the FY1996 Defense Authorization Act, and which has received 
consistent congressional support since its inception. Congress rejected these proposals, and added 
funding for the F136 to DOD’s budget request each year. 
In FY1996, defense authorization conferees (H.Rept. 104-450, Sec. 213) expressed their concern 
over a lack of engine competition in the JSF program and directed DOD to ensure that the 
program “provides for adequate engine competition” (p. 706). (At that time, the JSF program was 
The Joint Advanced Strike Technology Program, called JAST.) In FY1998, authorization 
conferees (H.Rept. 105-340, Sec. 213) directed DOD to certify that “the Joint Strike Fighter 
Program contains sufficient funding to carry out an alternate engine development program that 
includes flight qualification of an alternate engine in a joint strike fighter airframe” (p. 33). Since 
its inception in 1997, Congress has provided approximately $2.5 billion for the Joint Strike 
Fighter alternate engine program. The alternate engine program is expected to need an additional 
$900 million through 2013 to complete the development of the F136 engine. 
Some have criticized DOD and the Air Force for being short-sighted with its proposal to 
terminate the F136 alternate engine. Critics of the decision, not to mention OSD and the Air Force 
itself during testimony before Congress, note that it was driven more by immediate budget 
pressures on the department rather than long term pros and cons of the F136 engine program. 
Others applaud this decision, and say that single source engine production contracts have been the 
norm, not the exception. Long-term engine affordability, they claim, is best achieved by procuring 
engines through multiyear contracts from a single source. 
Cancelling the F-136 engine poses questions on operational risk and potential cost and savings. 
Additional issues include the potential impact this termination might have on the U.S. defense 
industrial base, and on U.S. relations with key allied countries. Finally, eliminating competitive 
market forces for DOD business worth billions of dollars may concern those who wish to change 
DOD’s acquisition system and achieve what they see as higher standards of accountability. 
This report will be updated as events warrant. 
 
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Introduction ..................................................................................................................................... 1 
Background ..................................................................................................................................... 2 
Congressionally Mandated Studies ................................................................................................. 3 
OSD Cost Analysis Improvement Group .................................................................................. 4 
Institute for Defense Analyses................................................................................................... 5 
Government Accountability Office ........................................................................................... 6 
Similarities and Differences Between the Studies..................................................................... 7 
Issues ............................................................................................................................................... 8 
Relations with Key Allies.......................................................................................................... 8 
Operational Risk...................................................................................................................... 10 
Cost and Savings ..................................................................................................................... 12 
Industrial Base......................................................................................................................... 15 
Acquisition Reform and Accountability.................................................................................. 18 
 
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Figure 1. F-35 STOVL Variant Weight Growth Projection ............................................................. 5 
Figure 2. GE/P&W Large Engine Forecasted Unit Production..................................................... 16 
Figure 3. GE/P&W Large Engine Forecasted Value (in $ Millions) ............................................. 17 
 
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Appendix A. DOD F136 Cost Analysis......................................................................................... 20 
Appendix B. F-35 Engine Components......................................................................................... 21 
 
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Author Contact Information .......................................................................................................... 21 
 
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The Department of Defense’s (DOD’s) FY2009 budget proposed for the third year in a row to 
cancel the F136 alternate engine for the F-35 Joint Strike Fighter (JSF). And, for the third year in 
a row, Congress rejected this proposal and provided funds to continue the F136. Appropriations 
conferees (H.R. 2638) provided a total of $465 million in F136 funding for FY2009. 
The F136 engine is built by the GE/Rolls Royce (GE/RR) Fighter Engine Team and is an 
alternate engine to the Pratt & Whitney (P&W)-built F135. Pratt & Whitney’s F135 engine is a 
derivative of its F119 engine developed for and used on the F-22. GE/RR’s F136 is a derivative of 
its F120 engine initially developed to compete with the F119. The alternate engine program was 
initiated by Congress in the FY1996 Defense Authorization Act, and has received consistent 
congressional support since its inception.1 The reason usually cited for this proposed cancellation 
is that it would save close to $2 billion over the Future Years Defense Plan (FYDP), yet entail 
little operational risk. 
Some DOD leaders, however, have expressed mixed feelings about the proposal to cancel the 
F136 and note that near-term budget constraints are driving their actions. On February 16, 2006, 
then Secretary of Defense Rumsfeld testified that the merits of terminating the F136 were “clearly 
debatable.”2 On March 1, 2006, Air Force Secretary Michael Wynne testified that he was worried 
about the “downstream effects” of this decision.3 Again in 2008, both Secretary Wynne and 
General Moseley, Air Force Chief of Staff, testified to their personal desire to keep the alternate 
engine program “alive.”4 These statements may suggest that there is a lack of consensus within 
DOD regarding the value of an alternate engine for the F-35. 
However in 2007, after overruling DOD’s second successive attempt to terminate funding for the 
second engine, Congress stipulated in the 2008 National Defense Authorization Act (NDAA) 
(P.L. 110-181, Sec 213))5: 
The Secretary of Defense was to “ensure the obligation and expenditure in each such fiscal 
year of sufficient annual amounts for the continued development and procurement of two 
options for the propulsion system for the Joint Strike Fighter.” 
The 110th Congress took exception to the third attempt by DOD to terminate funding for the 
alternate engine program. During one hearing, Representative Neil Abercrombie expressed 
frustration with DOD for not following congressional direction in the 2008 NDAA to ensure 
sufficient funding for a second engine.6 Representative Abercrombie concluded the hearing’s                                                                  
1 More information about the F-35 Joint Strike Fighter can be found in CRS Report RL31360, 
Joint Strike Fighter 
(JSF): Potential National Security Questions Pertaining to a Single Production Line, by Christopher Bolkcom and 
Daniel H. Else, and CRS Report RL30563, 
F-35 Lightning II Joint Strike Fighter (JSF) Program: Background, Status, 
and Issues, by Christopher Bolkcom
. 2 Michael Bruno. “House defense appropriators push back on JSF engine.” 
Aerospace Daily & Defense Report. 
February 17, 2006. 
3 CONGRESSIONAL TRANSCRIPTS. 
Reuters. Congressional Hearings. March 1, 2006. House Armed Services 
Committee Holds Hearing on FY2007 Budget: Air Force 
4 CONGRESSIONAL TRANSCRIPTS. 
Reuters. Congressional Hearings. March 5, 2008. Senate Armed Services 
Committee Holds Hearing on FY2009 Budget: Air Force 
5 See Conference Report to accompany H.R. 1585. 
6 CONGRESSIONAL TRANSCRIPTS. 
Reuters. Congressional Hearings. March 11, 2008. House Armed Services 
(continued...) 
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discussion on the alternate engine by telling Mr. John Young, Undersecretary for Acquisition, 
Technology, and Logistics, to “go back and add [the funding for the alternate engine] in.”7 
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In FY1996, defense authorization conferees (H.Rept. 104-450, Sec. 213) expressed their concern 
over a lack of engine competition in the JSF program and directed DOD to ensure that the 
program “provides for adequate engine competition.” (p.706)8 In FY1998, authorization 
conferees (H.Rept. 105-340, Sec. 213) directed DOD to certify that “the Joint Strike Fighter 
Program contains sufficient funding to carry out an alternate engine development program that 
includes flight qualification of an alternate engine in a joint strike fighter airframe.” (p.33) 
Congress’s interest in establishing and funding an alternate engine to the JSF’s primary engine—
the Pratt & Whitney F135—may have been informed by what has become known as “The Great 
Engine War” that ran from 1984 to 1994. The Great Engine War describes the competition 
between Pratt & Whitney (P&W) and General Electric (GE) to produce engines (the F100 and 
F110 respectively) to power the Air Force’s F-16 
Falcon fighter aircraft.9 This competition was 
held annually between 1984 and 1994 to produce and maintain these engines for the Air Force. 
After 1994, P&W and GE continued to compete for engine business among foreign air forces that 
operated the F-16 and F-15. At the time, this acquisition strategy was unprecedented and 
controversial. Many extolled the advantages of competition and the benefits it conferred to DOD 
and the taxpayer. Others, however, believed that the engine competition “unjustifiably 
jeopardized combat effectiveness and pilot survivability.”10 
The Great Engine War’s roots extend well before 1984. In the development of the F100 engine 
for the F-15 in the 1970s, historians note Air Force frustrations with Pratt & Whitney’s 
management along with concerns about a sole-source engine powering their fighter fleet as the 
impetus for an alternate engine. While the F100 was the most advanced engine ever developed at 
that time, its rushed development to meet F-15 initial fielding deadline prevented problems from 
being properly addressed. In addition, one report notes that “[t]he F100 engine was so powerful 
and the F-15 so maneuverable that pilots began pushing the aircraft to the edge of the 
performance envelope in ways that stressed the engine far more than had been anticipated.”11 
Mounting frustrations over Pratt & Whitney’s reluctance to fully address the F100’s shortcomings 
without additional funding resulted in the Air Force, Navy, and Congress working in concert to 
fund work on an alternate engine.12 
                                                                 
(...continued) 
Subcommittee on Air and Land Forces and the Subcommittee on Sea and Expeditionary Forces Holds Joint Hearing on 
the Department of the Navy and Air Force Tactical Aviation Programs. 
7 Ibid. 
8 At that time, the JSF program was The Joint Advanced Strike Technology Program (called JAST). 
9 While the competition was the result of the Air Force’s concerns with the reliability of the F100 in the new single-
engine F-16, GE’s F110 engine was also eventually used in the dual-engine F-15. 
10 Robert W. Drewes. 
The Air Force and the Great Engine War, National Defense University Press, Washington DC, 
1987. 
11 Karl G. Amick. 
The Next Great Engine War: Analysis and Recommendations for Managing the Joint Strike Fighter 
Engine Competition, Naval Postgraduate School, Monterey, CA. 2005, p. 8. 
12 Ibid, pp. 92-98. 
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After a number of contentious hearings in 1979, Congress provided funding through the Engine 
Model Derivative Program (EMDP), a congressionally directed program of the 1960s, for GE to 
develop its F101 alternate engine (to become the F110). Ultimately, DOD spent over $376 million 
to develop the F110 to compete with the F100, and $600 million to improve the F100’s durability 
and reliability to make it a stronger competitor. Proponents believe that the annual competition 
during the Great Engine War produced better engines, on better terms, for less money than would 
purchasing from a single company facing no competition. Recently, contrary opinions have 
emerged, and Pratt and Whitney notes that “[t]here is no evidence that the F-16 engine 
competition saved money.”13 However, a preponderance of the studies on the Great Engine War 
note that contractor responsiveness was the driving force behind the competition, and not dollar 
savings. 
Some have criticized DOD as being “penny wise and pound foolish” in its proposal to terminate 
the F136. Critics argue that this decision appears driven more by immediate budget pressures on 
the department rather than long term pros and cons of the F136 program. For example, Secretary 
of the Air Force Michael Wynne reportedly said that the idea of cancelling the F136 “came up 
during the QDR, in the course of attempts to identify ways to save costs at the Pentagon.”14 
Others applaud this decision, and say that single source engine production contracts are the norm, 
not the exception. Long-term engine affordability, they claim, is best achieved by procuring 
engines through multiyear contracts from a single source. 
Congressional response in 2006 and early 2007 to the F136 termination proposal was both 
positive and negative. Those in favor of continued F136 development prevailed, however. Both 
authorization and appropriations conferees included funds in FY2007 for continued F136 
development, strong language supporting the program, and directed DOD and other agencies to 
conduct independent analyses of potential F136 cost savings.15 By March 2007 OSD’s Cost 
Analysis Improvement Group, the Government Accountability Office, and the Institute for 
Defense Analyses had all completed their reports on the merits of the alternate engine program 
(results summarized in the next section). 
It appears that the Administration’s decision in FY2009 budget to terminate F136 is again 
influenced more by near-term budgetary pressures than by the potential gains in the future. The 
alternate engine program appears to be affected in budget considerations by the fact that its 
benefits won’t be realized for a decade, while its costs are noteworthy, and immediate. 
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The 2007 National Defense Authorization Act (P.L. 109-364; 120 Stat 2117 [Sec. 211]) directed 
OSD and the Comptroller General to conduct three independent cost-benefit analyses on having 
an alternate engine for the F-35 Joint Strike Fighter. Section 211 also directed OSD to continue 
funding the development and procurement of an alternate engine until the three directed reports 
were submitted and the congressional defense committees notified of any programmatic change. 
Each of these reports was conducted independently using the same data provided by the 
contractors and by the Joint Strike Fighter Program Office.                                                                  
13 “Joint Strike Fighter - Engine Development,” (JSF Talk-3) 
Talking Points. Pratt & Whitney. February 23, 2006. 
14 Richard Mullen. “Cutting JSF Engine Was Navy Idea: Wynne.” 
Defense Today Instant Update. March 2, 2006. 
15 See, H.R. 5631 (109-676), p. 228. H.R. 5122 (109-702) Sec. 211 (p.36). 
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OSD Cost Analysis Improvement Group (CAIG) concluded its analysis in March 2007.16 The 
CAIG compared the results of the engines developed during the “Great Engine Wars,” the engine 
competition for the F/A-18 aircraft,17 and the sole-source Pratt and Whitney F-119 engine for the 
F-22. Given their analysis of past cost performance stemming from competition, the CAIG report 
noted their baseline “assumptions [were] generally favorable to dual source case.”18 The CAIG 
assumed that the follower, in this case the GE-Rolls Royce Fighter Engine Team (F136), would 
meet leader (Pratt & Whitney F135) pricing in 2014 (first year of competition). The CAIG also 
assumed that there would be both an immediate 5% price decrease and a 5% increase in the rate 
for cost improvement (what the CAIG calls “learning curve rotation”19) over the lifetime of the 
program. 
Overall, the CAIG estimated that the competition would require a 21.1% reduction in costs (in 
constant FY2002 dollars) over the lifetime of the program in order to break even. The break-even 
cost reduction requirement climbs to 25.6% when converted to net present value.20 The CAIG 
estimated that DOD would be unable to recoup its initial investment in the alternate engine 
development program through procurement savings alone. The CAIG report noted DOD would 
have to effectively compete Operations and Support (i.e., maintenance) contracts and attain a 
25.6% savings, which the report seems skeptical of attaining, in order to eventually reach a 
“break even” point by 2040.21 
While the CAIG report highlights from a financial standpoint that the alternate engine program 
might eventually break even over time, the CAIG goes on to note a number of non-monetary 
benefits that could be gained through having an alternate engine program for the F-35. One of the 
most notable appears to be the issue of growth potential in the Joint Strike Fighter engine. As 
shown in the figure below, the CAIG estimates that the average aircraft weight growth of a 4th/5th 
generation fighter from Critical Design Review to Initial Operational Capability is 7.2% with a 
0.3% weight growth thereafter.22 Basically, the initial planned empty weight of an aircraft could 
                                                                 
16 The Cost Analysis Improvement Group (CAIG) is under the administrative control of OSD’s Director of Program 
Analysis and Evaluation and is tasked with providing independent cost assessments of major defense acquisition 
programs. The CAIG also serves as the principle advisor to the Milestone Decision Authority on program life-cycle 
costs. See DoDD 5000.04 for additional information on the CAIG and its independent analysis role. 
17 Unlike the F100/F110 competition, the competition for the F/A-18 (the F404 engine) differs from the Great Engine 
War in that both GE and P&W competed only in cost since they were both building identical GE-designed F404 
engines. Analysts note that the F404 competition removed a key component, engine design, since both companies built 
their engines to the same blueprints. Therefore, analysts note that the F404 competition did not achieve the same results 
as the previous F100/F110 competition for independently-designed engines. 
18 OSD Cost Analysis Improvement Group Report (v6), “F-35/JSF Alternate Engine Acquisition and Independent Cost 
Analyses,” March 15, 2007, Slide 31. 
19 In discussion with the CAIG, learning curve rotation was defined as the effect competition has on the learning curve. 
In this case, competition would result in both competitors streamlining their processes in order to compete more 
effectively (maximize efficiency), hence lower cost to the Air Force. 
20 Net present value is the discounted present value of the return on investment when taking risk and other potential 
investment opportunities into consideration. It is considered the standard method for financial appraisal of long-term 
projects. 
21 OSD CAIG Report, Slide 37. 
22 The CAIG’s analysis of expected future weight growth is not in line with the Joint Program Office’s estimate that 
weight will unchanged after Initial Operational Capability (IOC). The CAIG slide shows historical data showing 
expected weight growth of 2.8% to 11.5% following IOC from other 4th and 5th generation fighter aircraft. 
(continued...) 
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grow, over time, beyond the thrust margins of safety provided by the engine. Eventually, the 
engine would have to be upgraded for additional thrust to overcome the additional aircraft weight. 
The CAIG report notes that Pratt & Whitney’s F135 engine is already close to exceeding the 
designed engine temperature specifications. Therefore, the F135 engine would require additional 
modifications beyond that of the GE-Rolls Royce F136 engine to allow for thrust growth.23 
Figure 1. F-35 STOVL Variant Weight Growth Projection 
 
Source: OSD CAIG F-35/JSF Alternate Engine Acquisition and Independent Cost Analyses Report, March 15, 
2007. 
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The Institute for Defense Analyses (IDA) was selected by OSD as the Federally Funded Research 
and Development Center (FFRDC) to perform the independent cost analysis of the F136 engine 
program. IDA provided its cost analysis in March 2007 and completed its final report in July 
2007. IDA, as with the CAIG analysis, examined the Great Engine Wars of the 1980s along with 
the F404 engine competition for the F/A-18. Its analysis showed an estimated gross savings due 
to competition ranging from 11% to 18%.24 When examining past studies of various procurement 
                                                                 
(...continued) 
Additionally, the CAIG’s estimated pre-IOC weight growth of 6% is in stark contrast to the JPO’s estimate of 3%. 
23 Ibid. Slides 25 and 26. Note: Since the F136 is earlier in its development cycle, analysts comment that its design is 
not as set as the F135 and could better incorporate engine growth requirements without major modifications. 
24 Institute for Defense Analyses Report: “Joint Strike Fighter (JSF) Engine Cost Analysis: Summary of Results 
(Revised),” March 2007, Pg S-3. NOTE: IDA determined a 11% savings from competition over the upgraded F100-220 
(continued...) 
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competitions, IDA determined that these studies showed an average (un-weighted) savings of 
14.6%.25 
Examining the break-even point for the case of the F136, IDA determined the overall increase in 
cost of having an alternate engine program (both direct and indirect costs) to be $8.8 billion 
(FY2006 dollars).26 As was the case with the CAIG’s findings, IDA concluded that it would not 
be feasible to recoup DOD’s investment in an alternate engine if procurement costs alone were 
competed. IDA determined for the alternate engine program to break even, on a net present value 
basis, the savings required would fall from an “unrealistic” 40% to 18% (net present value) when 
Operations and Support (O&S) contracts are also competed.27 This is somewhat in line with the 
CAIG and shows a potential for DOD to recoup its investment throughout the life of the alternate 
engine program. However, IDA noted that DOD “has not typically linked procurement and O&S 
costs in a single competition,” and therefore had limited historical data in which to estimate 
plausible O&S savings (raising doubts as to how successful this will be in the future).28 
IDA, like the CAIG, also noted a number of other benefits stemming from competition. Improved 
fleet readiness, reduced risk, and industrial base sustainment are common benefits cited by both 
reports. However, IDA notes that contractor responsiveness was “the primary motivation for the 
Great Engine War.”29 IDA goes on to note that by 2035 that the F-35 would comprise 95% of the 
U.S.’s fighter attack force. Thus, with an alternate engine program, any future groundings will 
only affect a portion of the fleet. In addition, enhanced industry responsiveness to engine 
upgrades and fixes resulting from competitive forces could potentially have a profound effect on 
overall fleet readiness. 
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The Government Accountability Office (GAO) report noted that savings of 10.3% to 12.3% 
would be required for the alternate engine program to break even.30 GAO goes on to note that 
analysis of past engine competitions have shown financial savings of up to 20%.31 Therefore, 
GAO concludes that it is reasonable to assume that savings generated from competing the engine 
would recoup DOD’s investment. In addition, during testimony, Michael Sullivan, Director of 
GAO’s Acquisition and Sourcing Management, noted that he believed the alternate engine 
program would reach its break-even point by the late 2020s.32 
                                                                 
(...continued) 
P&W engine and an 18% savings from competition between the original P&W F100 and the GE F110 (Pg 23). 
25 
Ibid. Pg 24. However, IDA noted “significant inconsistencies” with studies of past competitions which need to be taken 
into consideration when evaluating potential savings. 
26 Ibid., p. 20. 
27 Ibid., p. S-3. 
28 Ibid., p. S-3. 
29 Ibid., p. 44. 
30 
Analysis of Costs for the Joint Strike Fighter Engine Program, GAO-07-656T, March 22, 2007, p. 1. 
31 Ibid., p. 2. 
32 CONGRESSIONAL TRANSCRIPTS. 
Reuters. Congressional Hearings. March 2, 2007. House Armed Services 
Subcommittee on Air and Land Forces and the Subcommittee on Seapower and Expeditionary Forces Holds Joint 
Hearing on the Department of Defense Aircraft Programs. 
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What appears to be the key difference between the three studies is the break-even point analysis 
for the alternate engine program. The GAO noted in its report a maximum savings requirement of 
12.3% in order to recoup DOD’s “future” investments in the late 2020s. OSD’s CAIG and IDA 
require savings of 25.6% and 18% respectfully, in net present value, to break even in the 2040 
time frame. Michael Sullivan, from GAO, testified that he speculated the other two studies may 
have included a portion of costs sunk into the alternate engine program.33 However, in response, 
James Woolsey, from IDA, noted that IDA did not include sunk costs, and also commented that 
he thought the major difference between GAO and the other studies had to do with costs 
associated with operations and support (O&S).34 He contended that IDA included sustainment 
engineering costs, costs to improve the engine, and additional costs tied to two supply chains that 
might not have been included in the GAO’s analysis. 
GAO analysts, however, noted that under a competitive environment, the need for an F-35 engine 
Component Improvement Program (CIP) would be reduced, and therefore potential funding 
required for CIP was not included in their analysis.35 Engine CIP funding is normally designed to 
be “reactive and proactive throughout an engine’s life cycle to resolve newly identified problems, 
and to find ways to reduce costs of aircraft and engine ownership.”36 Basically, CIP is designed to 
fund problem solving and problem avoidance along with product improvement and maturation.37 
However, CIP is not designed to fund engine performance improvements beyond the initial 
design, only to reduce life cycle costs of operating the engine. It was GAO’s opinion that 
competition would result in industry funding its own product improvements in order to win 
greater market share. Therefore, the need for CIP funding would be reduced from what is 
normally budgeted for sustainment engineering. IDA, in its report, fully examined the 
requirement for CIP and noted there was still a requirement for CIP with the F100 and F110 
engine, both engines that were part of the Great Engine War.38 
While all three independent reports came to different conclusions as to the break-even point, they 
all agreed there are a number of non-financial benefits that would be derived from an engine 
competition. Each of the studies notes expected improvements in fleet readiness, contractor 
responsiveness, sustainment of industrial base, and stronger international relations by having the 
alternate engine for the F-35. The GAO report notes that DOD’s program management advisory 
group in 1998, and again in 2002, recommended continuing the alternate engine program due to 
these non-financial benefits in spite of only finding marginal financial benefits. 
                                                                 
33Ibid. 
34 Ibid. 
35 Telephonic conversation with Bruce Fairbairn, GAO Assistant Director Acquisition and Sourcing Management, 
April 23, 2008. 
36 Chris J. Borer. 
An Analysis Of The Aircraft Engine Component Improvement Program (CIP): A Life cycle Cost 
Approach, Naval Postgraduate School. December 1990. Pg. 5. 
37 Ibid. 
38 Telephonic conversation with Mr. James Woolsey, IDA’s project leader for their analysis on the F136 alternate 
engine report, April 25, 2008. 
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As DOD has noted, cancelling the F136 poses questions on operational risk and potential cost and 
savings. Additional issues include the potential impact this termination could have on the U.S. 
defense industrial base, and on U.S. relations with key allied countries. Finally, eliminating 
competitive market forces for DOD business worth billions of dollars may concern those who 
wish to change DOD’s acquisition system to achieve what they see as higher standards of 
accountability. 
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The F-35, unlike the F-22, has been designed from the outset for export. Allied participation in 
JSF program development, and sales stemming from program participation, have been actively 
pursued as a way to defray some of the cost of developing and producing the aircraft. Congress 
insisted from the outset that the JAST program include ongoing efforts by the Defense Advanced 
Research Projects Agency (DARPA) to develop more advanced short takeoff and vertical landing 
(STOVL) aircraft, opening the way for British participation. 
Eight countries—Australia, Canada, Denmark, Italy, Netherlands, Norway, Turkey, United 
Kingdom—have pledged about $4.5 billion to join in JSF development as partners for the initial 
System Development and Demonstration (SDD) phase. In addition, all eight partner nations have 
signed the subsequent Production, Sustainment, and Follow-on Development (PSFD) 
Memorandum of Understanding stating their intentions to actually purchase the aircraft. Israel 
and Singapore have both signed letters of intent to become Security Cooperation Participation 
(SCP) nations in the JSF program and to contribute $50 million. Spain, Greece, Japan, and South 
Korea have also been expressing interest in purchasing the F-35, though none of those nations are 
current participants in the program. Jon Schreiber, Joint Strike Fighter Director of International 
Programs, recently noted that international sales of F-35s could exceed 2,600.39 The Teal Group 
estimates the export market for the F-35 to be between 1,700 and 2,500 aircraft.40 
The United Kingdom is the biggest participant and the only Level 1 partner nation in the 
program.41 On December 20, 1995, the U.S. and British governments signed a memorandum of 
understanding (MOU) on British participation in the JSF program as a collaborative partner in the 
definition of requirements and aircraft design. This MOU committed the British government to 
contribute $200 million towards the cost of the 1997-2001 concept demonstration phase.42 In 
addition, on January 17, 2001, the United Kingdom signed an MOU with the United States 
committing the British government to spend $2 billion on JSF SDD. British firms, such as Rolls-
Royce and BAE, have benefitted from the US/UK partnership in JSF. BAE is a major partner to 
Lockheed Martin and is providing the aft fuselage, empennage, and Electronic Warfare Suite for 
                                                                 
39 Carlos Munoz. “JSF Program Leaders Expect Surge in International Participation,” 
Inside The Navy, August 27, 
2007. Note: Mr. Schreiber noted that overall F-35 production could exceed 5,000. Noting the expected US procurement 
of around 2,400 aircraft, the remaining 2,600 would be international sales. 
40 Richard Aboulafia. Lockheed Martin F-35 Joint Strike Fighter Program Briefing, The Teal Group, March 2008. 
41 Level 1 Partner status requires approximately 10% contribution to aircraft development and allows for fully 
integrated office staff and a national deputy at director level. Only one Level 1 partner nation allowed. See 
http://www.teamjsf.com for more information. 
42 U.S., U.K. Sign JAST Agreement. 
Aerospace Daily, December 21, 1995: 451. 
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the F-35. Also, not only is Rolls-Royce partnered with GE on the F136 engine, Rolls-Royce is 
under contract with Pratt & Whitney to produce the LiftSystem components of the F135 STOVL 
Propulsion System. The 2001 contract with Pratt & Whitney to cover the design and development 
work of the STOVL elements during SDD is worth $1 billion to Rolls-Royce over 10 years.43 
Regardless of which engine is placed in the F-35, Rolls-Royce LiftSystem will provide the 
vertical lift of all STOVL aircraft. 
Friction has existed between DOD and many foreign partners in the JSF program. Denmark, Italy, 
the Netherlands, Norway, and Turkey have expressed dissatisfaction with the quality and quantity 
of the work their companies have been awarded on the F-35.44 These countries have threatened to 
reduce their participation in the program, or purchase other European fighters instead of the F-35. 
The governments of Italy and the United Kingdom have both lobbied for F-35 assembly facilities 
to be established in their countries. Current international content in the initial F-35 aircraft is 
approximately 20%.45 Lockheed Martin expects international content to potentially expand to 
about 30% as the program transitions to full-rate production and the supply base potentially 
diversifies.46 
Technology transfer has also been a contentious issue, with foreign partners arguing that the 
United States is too cautious in sharing the JSF’s technical capabilities. Congress, in the John 
Warner National Defense Authorization Act for Fiscal Year 2007, sensing United Kingdom 
frustrations with technology-sharing, advised the Secretary of Defense to share technology 
consistent with the national security interests of both nations.47 Program officials note that they 
are working with partner nations to improve their ability to effectively compete for JSF work and 
are working with DOD expedite technology-transfer issues.48 
Canceling the F136 would likely mean a considerable loss of revenue for GE’s UK-based partner, 
Rolls Royce. Although Rolls Royce has established business relations with Pratt & Whitney, this 
business appears to be far short of the 40% partnership Rolls enjoys with GE. In addition, Rolls 
Royce will be opening up a new plant in Virginia in 2009 that is anticipated to make parts for the 
F136 engine.49 
It is unclear how, or to what extent, terminating the F136 would harm the JSF program’s 
international participation. Early allied response has not been positive. The United Kingdom’s top 
defense procurement official reportedly stated that his country would cease participation in the 
JSF program if the F136 engine were cancelled and technology transfer issues were not resolved 
                                                                 
43 
“Rolls-Royce Finishes First JSF Propulsion System Flight Hardware,” Rolls-Royce Media Room at http://www.rolls-
royce.com/media/showPR.jsp?PR_ID=40243. 
44 “Norway Signs Industrial Partnership with Eurofighter Consortium,” 
Defense Daily, January 29, 2003. Joris Janssen 
Lok, “Frustration Mounts Among JSF Partners,” Jane’s Defense Weekly. March 24, 2004. Thomas Dodd, “Danish 
Companies Consider Quitting JSF Programme,” Jane’s Defence Weekly, January 9, 2004. Tom Kingston, “Unsatisfied 
Italy May Cut JSF Participation,” Defense News, May 10,2004. Lale Sariibrahimoglu, “Turkey may withdraw from 
JSF program,” Jane’s Defence Weekly, November 10, 2004. 
45 “F-35 International Program Content,” JSF Joint Program Office paper, March 4, 2008. 
46 Ibid. 
47 P.L. 109-364; 102 Stat 2134; October 17, 2006. 
48 Eric Tegler, “International Instrument: Building the F-35 In Partnership,” 
F-35 Lightning II Commemorating First 
Flight, p. 81
. 49 John R. Blackwell, “New Plant To Add 170 Jobs,” 
Richmond Times-Dispatch, November 21, 2007. 
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to its satisfaction.50 In addition, Dr. Liam Fox, a Conservative member of the House of Commons, 
stated back in 2006 that the Pentagon’s decision to drop the F136 would also “invariably effect 
future procurement decisions, with seriously negative consequences that may not be fully 
appreciated on this side of the Atlantic.”51 Dr. Fox goes on to say that “without doubt, 
cancellation of the program would play into the hands of those in Europe who are even now all 
too willing to suggest the U.S. cannot be relied on and that Britain should look instead to France 
and European institutions on defense.”52 
However, other European countries, such as the Netherlands, have firms making inroads into both 
the F135 and F136 programs. The Dutch currently have 74 companies and research labs involved 
in the JSF program.53 As European companies secure more and more contracts, the debate within 
each of the partner nations over the need for the second engine might become more complicated. 
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DOD officials argue that terminating the F136 poses little operational risk. The decision to pursue 
an alternate engine for F-14s, F-15s, and F-16s, they say, came at a time when the Services were 
dissatisfied with the performance of existing engines (TF30 and F100). During the “Great Engine 
War,” DOD was more motivated to improve engine performance, reliability, and to reduce 
operational risk than by potential cost savings. DOD argues that these same conditions do not 
exist today. 
In a briefing provided to Congress in 2006, the DOD Office of Program Analysis and Evaluation 
(PA&E) stated the F135 engine produced by Pratt & Whitney (P&W) for the F-35 was 
performing well.54 Further, PA&E stated that the F119 engine that P&W produced for the F-22A 
Raptor, which served as the basis of the F135, is also performing well. PA&E notes that the F119 
has performed well after roughly 18,000 flight hours and will achieve 100,000 flight hours by 
2009. This briefing also notes that the F-22 
Raptor and the F/A-18E/F 
Super Hornet rely on a 
sole source engine supplier (the P&W F119 and GE F414 respectively), implying that the F-35 
can likewise rely on a single engine manufacturer. However, by the time the decision was made to 
divide engine production contracts between GE and P&W in 1984, the P&W F100 engine had 
accumulated 2,000,000 hours of operational service. By comparison, the 18,000 hours of testing 
might be considered a modest foundation to make projections of the F119’s future performance. 
DOD also argues that industry advances in engine design tools such as computational fluid design 
for airflow prediction, and advanced software for prognostic health monitoring, further reduce the 
risk of powering the F-35 with a single type of engine.55 Presumably, using these tools will result 
in engines that are capable of self-diagnosis and notification to the pilot of impending failure vice 
simple notification that a failure has occurred. Advanced warning of impending failures will not                                                                  
50 Megan Scully. “British Demand Better Access To Fighter.” 
NATIONAL JOURNAL’S CONGRESS DAILY AM. March 15, 2006. George Cahlink. “U.K. Procurement Chief Warns Backup Engine Dispute Threatens JSF Deal.” 
Defense Daily March 15, 2006. 
51 Rodney L. Pringle, “JSF Engine Rumblings,” 
Military Aerospace Technology, October 8, 2006. 
52 Ibid. 
53 Joris Janssen Lok. “Double Dutch; Pratt, Rolls Involve More Dutch Partners in F135, F136 Programs,” 
Aviation 
Week & Speace Technology, February 11, 2008. 
54 “JSF Alternate Engine Decision” Briefing. OSD/PA&E. February 27, 2006. 
55 Ibid. 
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only allow the pilot time to land prior to failure, it will allow more efficient and cost-effective 
maintenance procedures and quicker diagnosis of required repair parts. 
Others who support DOD’s decision to terminate the F136 argue that an alternate engine will not 
help mitigate risk. One defense analyst postulates that the alternate engine could actually increase 
operational risk. This analyst notes that engines undergoing maturation first in a twin-engine 
aircraft (such as the F-15, F-22, or the F/A-18) prior to use in a single-engine aircraft allow more 
time for detecting and fixing engine deficiencies.56 Another analyst, however, notes that the F135 
is quite different than the F119 it was derived from.57 Therefore, while being a derivative of an 
engine first introduced on the twin engine F-22, it is still expected to undergo developmental 
growing pains with the F-35. In the same vein, the F136 is three to four years behind the F135 in 
its development and should undergo its own set of developmental growing pains and potential for 
cost growth. 
Recent events with the F135 engine development have increased attention to the issue of risk. 
Once on August 30, 2007, and again on February 4, 2008, the F135 engine experienced testing 
failures while on the test stand. The JSF Joint Program Office noted the engine failures in both 
cases were due to “high-cycle fatigue” resulting in the failure of a third-stage turbine blade.58 
William Balderson, from the Department of the Navy, noted during congressional testimony that 
the second engine failure was as a result of ongoing testing to determine the causes of the first 
failure on August 30.59 Mr. Balderson goes on to note that Pratt & Whitney appears confident that 
it understands the root causes of the malfunctions and that a design fix is in the works and will be 
implemented once testing is complete.60 Program and Service officials note that these engine 
malfunctions have pushed back the expected first flight of the F-35B aircraft a month or two. 
These engine failures and resulting delays may have contributed to a reported cost overrun of up 
to $850 million in the F135 program.61 
Those supporting an alternate engine point to the potential risk of a future fleet-wide grounding 
and note that the F-35 will make up a preponderance of the Air Force’s fighter fleet. Currently, 
the Air Force has 184 F-22s with a potential for maybe an additional 24 aircraft. The Air Force is 
also currently expected to procure 1,763 F-35s over the next 20 plus years. A future fleet-wide 
grounding of the F-35s, they maintain, would potentially have a debilitating effect on the Air 
Force. A similar issue, though unrelated to the aircraft engines, was recently experienced when 
the Air Force twice grounded its fleet of F-15s because of structural problems. The Air Force, 
however, was able to continue combat operations by leaning on its sizeable fleet of F-16s to take 
up the slack. The Navy’s operational risk should be reduced because its fleet will be more 
balanced with F/A-18s using the GE-404 (or 414 on the E/F) engines along with their F-35s. 
While fleet-wide groundings for engine-related malfunctions are rare, they do happen. The 
Marine Corps, for example, grounded 106 AV-8B Harriers in July 2000 after a faulty engine 
                                                                 
56 Loren Thompson. “Powering JSF—One Engine Is Enough.” 
Lexington Institute, January 2008, p. 10. 
57 Telephonic conversation with Richard Aboulafia, Teal Group, on April 22, 2008. 
58 Jason Simpson. “Davis: JSF Program Office Anticipated Early-Stage Engine Problems.” 
Inside the Air Force, 
February 15, 2008. 
59 CONGRESSIONAL TRANSCRIPTS. 
Reuters. Congressional Hearings. April 9, 2008. Senate Committee on Armed 
Services, Subcommittee on Airland, hearing on Fiscal Year 2009 Budget for Air Force and Navy Aviation programs.. 
60 Ibid. 
61 Tony Capaccio. “United Technologies F-35 Engine Over Cost Etsimate.” 
Bloomberg.com. July 21, 2008. 
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bearing was cited as the cause of a crash.62 Since 1997, 66% of the Navy’s grounding bulletins 
were for airframe related issues, whereas 18% were related to engine issues.63 The Air Force has 
experienced only two system-wide fleet stand-downs due to engine issues since 1990.64 Some 
have responded that the Air Force could find itself in the same grounding predicament with the F-
35, based on non-engine issues, regardless of whether there is an alternate engine, because of 
reduced diversity of its future fighter fleet. 
One issue that pertains to operational risk that has not been discussed by DOD is that of reduced 
fleet readiness due to, for example, a lack of spare parts. Two manufacturers would maintain two 
supply chains, and perhaps additional suppliers for critical parts. Eliminating one manufacturer 
could lead to fewer suppliers and potentially leave the remaining supply chain more vulnerable to 
disruptions caused by labor disagreements, foreign takeovers, or natural disasters. On the other 
hand, splitting the engine buy will reduce the workload for the supply vendors and increase the 
level of uncertainty as to the amount of business they will receive. In addition, one defense 
consulting firm notes that approximately 50% of each engine is procured in a competition 
environment today, leading one to conclude there are multiple vendors available that could create 
parts for each of the engines.65 
During a March 1, 2006, hearing, Secretary of the Air Force Michael Wynne discussed the 
potential cost and risk of having one engine supplier versus two. Secretary Wynne said that the 
decision to terminate the F136 was “a very tough call because it involves industrial base and 
involves long-term reliability statistics and involves economics.” In the context of reliability and 
risk, Secretary Wynne continued with the statement that “I don’t like to see our industrial base go 
to a single supplier.”66 
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Over the past three years, DOD has mainly explained its decision to terminate the F136 on its 
financial return on its investment. Congressional testimony by OSD/AT&L, the Air Force, and the 
Navy all note that the business case does not sufficiently support the large, up-front investment in 
an alternate engine for the F-35. As was previously noted by the three congressionally directed 
studies and associated testimony back in 2007, while there are a number of non-financial benefits 
to having an alternate engine, the ability for DOD to recoup its financial investment is a matter of 
great debate. 
It is not surprising that there is a lot of debate on the merits of the F136, especially given the 
complexity of the issue and the amount of resources required to fund a second engine. There is 
inevitably a lot of subjectivity when analyzing business cases. In the case of the F136, one will 
need to assess how likely it is for the program to achieve the estimated savings, the likely number 
of engines that will be acquired, the potential for the fleet to suffer a debilitating issue related to                                                                  
62 Mark Oliva, “Pilots defend Harrier jet.” 
Stars and Stripes. (Pacific Edition). January 19, 2003. 
63 “JSF Engine Second Source Executive Summary,” Whitney, Bradley, and Brown Consulting; December 2006. Slide 
23. 
64 Ibid. 
65 Ibid. Slide 22. Note: See http://www.wbbinc.com on Whitney, Bradley, and Brown, their corporate profile and their 
clients. 
66 CONGRESSIONAL TRANSCRIPTS. 
Reuters. Congressional Hearings. March 1, 2006. House Armed Services 
Committee Holds Hearing on FY2007 Budget: Air Force 
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the engine, how much better the engine designs will improve, and how much more responsive the 
manufacturers will be under a competitive environment. Not only will one have to assess the 
ability to achieve financial and non-financial improvements, but one will have to assess the 
qualitative worth of such savings when compared to the opportunity costs of the investment. Both 
within DOD and outside, analysts note that the F136 program requires a large up-front investment 
for benefits that won’t be realized for decades. These factors arise in an environment where DOD 
is facing tough financial choices while on a war-footing and the potential for budget reductions as 
administrations change. 
Two of the key variables in analyzing the business case for the F136 is the development cost of 
the alternate engine and the number of engines that those costs will be amortized over. Beginning 
with expected procurement numbers, DOD is currently planning on buying 2,443 F-35s 
(excluding test articles). The Air Force current engine production profile for the F-35 is for a total 
of 3,649 engines (3,173 primary engines and 476 spares).67 This current engine production profile 
is about 100 engines more than the three congressionally directed studies used for their analysis 
back in 2007. However, the overall planned DOD procurement of 2,443 operational F-35s is over 
500 aircraft less than the 1996 preliminary planning estimate of 2,978 aircraft. It should be 
emphasized that DOD’s planned buy of 2,443 aircraft has remained steady since 2003 when the 
Department of the Navy, under the Tactical Aircraft Integration Plan, reduced its buy from 1,083 
to 680 aircraft.68 
While DOD’s procurement numbers have remained steady over the past five years, international 
orders, as previously mentioned, are expected to exceed the minimum anticipated orders of 646 
aircraft and could reach over 2,500 aircraft.69 In addition, the F-35 is designed to take the place of 
the F-16, an aircraft with an initial planned run of 1,388 aircraft that eventually exceeded 4,000 
built.70 DOD has been focused on keeping the F-35 program on track and procurement numbers 
sufficient to prevent undo cost growth. Deputy Secretary of Defense England, in a letter to 
Congress, noted the Department’s desires to procure more F-35s than additional F-22s.71 Given 
the disparity between the AF requirement for 381 F-22s and the current program of record of 183 
aircraft, there appears to be strong potential for the Air Force requirement of F-35s to grow 
beyond 1,763 aircraft. If the F-35 program goes beyond current procurement expectations (both 
for domestic and international orders), the business case for keeping the F136 program alive 
might be significantly strengthened. 
However, current Service and Allies budget pressures along with aircraft cost and development 
issues may drive lower procurement numbers. One defense analyst notes the Air Force’s 
procurement numbers “are likely to fall to around 1,200-1,400 [aircraft].”72 Another analytical 
                                                                 
67 SAF/LLW correspondence; April 30, 2008. 
68 The Department of the Navy’s buy includes both the Navy’s F-35Cs and Marine Corps F-35B’s. The Marine Corps 
have set their requirement for F-35Bs at 420, which would leave 260 F-35Cs for the Navy if the Department of the 
Navy limits the buy to 680 and fully supports the Marine Corps requirements. 
69 While procurement numbers have remained steady, the length of the acquisition program has been extended due to 
issues with aircraft weight growth resulting in program delays. 
70 Institute for Defense Analyses Report: “Joint Strike Fighter (JSF) Engine Cost Analysis: Final Report,” July 2007, p. 
7. 
71 
Deputy Secretary of Defense Gordon England letter to Representative Phillip Gingrey in response to Rep. Gingrey’s 
concerns over the F-22; January 14, 2008. 
72 Richard Aboulafia. Lockheed Martin F-35 Joint Strike Fighter Program Briefing, The Teal Group, March 2008. 
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assessment notes the Air Force’s strategy to replace legacy aircraft on a one-for-one basis is 
excessive, and that one might contemplate 800-1000 F-35As as being sufficient.73 The 
Department of the Navy, on the other hand, is facing a tactical aircraft shortfall of around 125 
aircraft in 2017. While the Marine Corps appears focused on acquiring the STOVL variant for its 
modernization efforts, the Navy could potentially acquire additional F/A-18E/Fs to help reduce 
its fighter shortfall. With the Navy being the only customer for the F-35C, reductions in their 
numbers could put the viability of the C-variant into question. In addition, there could be fallout 
over the KC-X competition in which Northrop Grumman/EADS KC-30 tanker won over 
Boeing’s KC-767. Potential fallout could affect the F-35’s international orders if the competition 
results are overturned and European nations backlash against the pricy U.S. fighter. Finally, any 
program setbacks that result in excessive cost growth beyond what has already been encountered 
to date could have a profound effect on aircraft orders on both sides of the Atlantic. Therefore, 
there is a potential that DOD’s business case planning factors for the F136 alternate engine might 
not reach the levels assumed in the current studies—and therefore become a very expensive “nice 
to have.” 
The other key variable to the business case analysis, the remaining developmental costs of the 
F136 engine, is estimated to be $1.36 billion from FY2009 to FY2013.74 Noteworthy is the fact 
that, from FY1995 to FY2008, approximately $2 billion has been provided by DOD to develop 
the F136 engine—therefore over half of the total development cost of the F136 are sunk costs. 
While currently not in the DOD budget, $495 million will be required in FY2009 to continue 
developmental efforts on the F136.75 
The $290 million required for Component Improvement Program (CIP) efforts might be 
debatable by some. As previously stated, GAO did not incorporate CIP in its 2007 analysis 
because of its position that competition would reduce its need.76 The GAO analysts felt that 
competition would drive the manufacturers to make the improvements in their engines on their 
own to help them attain a larger share of the engine contracts. IDA, however, did include CIP 
after its analysis of the results of the Great Engine War. IDA notes that while CIP funding did not 
exceed 4% of the estimated life cycle costs in any of their analysis, it is still a cost “that must be 
approximately doubled to ensure two equally supported engine designs.”77 
Procurement and spares costs will be required, whether there is a single or dual supplier of 
engines. While the numbers could result in a greater number of spare engines required under a 
dual supply environment, the overall number should remain close. However, there will be 
additional costs in maintaining two separate production and supply lines along with the additional 
management required by the services. 
                                                                 
73 Steve Kosiak and Barry Watts, 
US Fighter Modernization Plans: Near-Term Choices, Center for Strategic and 
Budgetary Assessments, 2007. 
74 Through FY2009 approximately $2.5 billion has been provided to develop the F136 engine. In April 2008, the cost to 
complete the F136 development phase was estimated at $1.36 billion from FY2009 to FY2013. (Source: SAF/LLW.) 
Accounting for the $465 million provided in FY2009, the remaining development costs for F136 should be 
approximately $895 million. 
75 Ibid. 
76 Telephone conversation with Bruce Fairbairn, GAO Assistant Director Acquisition and Sourcing Management, April 
23, 2008. Note: While GAO did not include CIP in its analysis, the analyst did not say that the requirement would be 
completely eliminated, just reduced. 
77 Institute for Defense Analyses Report: “Joint Strike Fighter (JSF) Engine Cost Analysis: Final Report,” July 2007, p. 
87. 
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As noted earlier, DOD officials have expressed concern over the potential impact of this proposed 
termination on the industrial base. Further, DOD analyses acknowledge that the F136 alternate 
engine provides “significant” industrial base benefits.78 Therefore, it is reasonable to assume that 
the decision to terminate the F136 may have negative consequences on the industrial base. The 
debate focuses on 
how significant these negative consequences may be. 
The industrial base issues discussed and debated in hearings and other public fora have focused 
on whether a single supplier of fighter aircraft engine will result in costlier engines over time and 
whether reliable access to engines and spare parts might be jeopardized. The root of this question 
is what effect canceling the F136 engine will have on GE’s ability to continue to compete in the 
high performance fighter aircraft engine business. Currently, the only U.S. manufacturers of 
fighter aircraft engines are P&W and GE.79 
GE is a dominant player in the large, commercial aircraft engine market. By most estimates, GE 
has captured approximately 50% of this market (
Figure 2 shows GE’s large engine position in 
relation to P&W’s).80 GE’s current business in building and supporting high-thrust, high-
performance, fighter aircraft engines is more modest. Currently, GE builds and maintains engines 
(F400 series) for the Navy’s 462 F/A-18E/F 
Super Hornets. It is expected to also build engines 
for the Navy’s 90 EA-18G 
Growlers. GE supports the F110 series of engines for domestic and 
international clients. Finally, GE may be competitive in engine competitions for large unmanned 
aerial vehicles (UAVs). 
                                                                 
78 “JSF Alternate Engine Decision” Briefing. OSD/PA&E. February 27, 2006. 
79 However, as previously noted, Rolls Royce will be opening up a new plant in Virginia in 2009 that, in part, is 
planned to support their work in the F136. 
80 A majority of GE’s commercial sales come from the CFM56 engine. Since GE has a 50% share of the CFM56 with 
France’s Snecma, the Teal Group reduced GE’s commercial CFM56 numbers by half. This methodology was used with 
other joint engine ventures. The future engine for the 737 and A320-X is still undecided between GE, P&W and Rolls 
Royce. However, the Teal Group accounted for the KC-45 competition by awarding its engines to GE. 
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Figure 2. GE/P&W Large Engine Forecasted Unit Production 
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Source: The Teal Group, May 9, 2008. 
It appears that if the F136 were cancelled, GE’s fighter aircraft design and manufacturing 
capabilities would not disappear immediately. The business outlined above is likely sufficient to 
maintain GE’s design teams, engineers, and assembly line workers, and much technology and 
expertise can be extracted from the commercial business lines. GE’s own experience during the 
Great Engine War shows that a company on the periphery of a business area can “catch up,” and 
beat an incumbent in head-to-head competition, even if that incumbent had been producing a 
particular type of engines for a decade. 
Each of the three congressionally mandated studies commented on the effects to the industrial 
base. The CAIG and IDA both noted GE’s dominance in the commercial engine market. The 
CAIG study noted that GE produced 1,000 commercial engines in 2007, compared to 220 
commercial engines for P&W.81 Additionally, the CAIG noted that P&W is highly dependent on 
military sales (~50% of direct sales in 2006) vice GE (~15%).82 While there appears to be no 
significant loss of overall engineering talent at either manufacturer, the CAIG highlighted that 
~200 GE military jet engineers would be unable to transfer skills to GE’s commercial engines if 
the F136 engine was terminated. 
IDA provided more in-depth analysis on the effects to the industrial base in their final report. 
While they concluded that the U.S. industrial base may not be “irreparably harmed” if the F136 
engine is terminated, they expressed reservations in DOD placing all of its fighter engine 
production with a firm that has a weak position in the commercial marketplace.83 IDA felt that a 
firm with a weak commercial marketplace presence would have fewer resources that could be 
leveraged for use on DOD products. IDA also examined the top suppliers of components for the 
F136 and determined that it is “unlikely that any supplier would exit the domestic industrial base 
                                                                 
81 OSD Cost Analysis Improvement Group Report (v6), “F-35/JSF Alternate Engine Acquisition and Independent Cost 
Analyses,” March 15, 2007, Slide 44. 
82 Ibid. 
83 IDA JSF Final Report, p. 169. 
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because of F136 termination.”84 Overall, IDA concluded that the U.S. industrial base would be 
stronger as a result of an active F136 program. 
One defense analyst, however, postulated that GE’s current commercial market dominance over 
P&W could actually weaken the industrial base if GE was to secure a sizable share of the JSF 
engine business.85 This analyst noted that GE, from 2007 to 2016, is expected to produce more 
engines for the F/A-18 than P&W will for all of the fighter aircraft it supports (F-15, F-16, F-22, 
and F-35).86 The Teal Group’s analysis appears to back up this claim, and 
Figure 3 shows the 
forecasted value of GE’s dominance in large engine production. Additionally, other than UAVs, 
the only other potential market for a fighter engine derivative appears to be the Next Generation 
Bomber due to be produced by the end of the next decade. Therefore, JSF engine contract success 
could have a profound effect of P&W’s “bottom line.” 
Figure 3. GE/P&W Large Engine Forecasted Value (in $ Millions) 
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Source: The Teal Group, May 9, 2008. 
Note: The same methodology was used by the Teal Group as was used in the forecasted unit production figure. 
Additional industrial base issues have not yet been widely debated, but may also inform decisions 
on the future of the F136. One issue concerns export and competitiveness. The JSF is a 
centerpiece of the federal government’s fighter aircraft policy. Since the program’s beginning, the 
desire to produce a cost-effective, multirole aircraft appears to have been shaped by consideration 
of what the international market would bear.87 The F-35 is designed as an export aircraft, and one 
that is hoped to leverage the international success of the F-16 Falcon (another cost effective,                                                                  
84 Ibid., p. 165. 
85 Loren Thompson. “Powering JSF—One Engine Is Enough.” 
Lexington Institute, January 2008, p. 14. 
86 Ibid., p. 15. 
87 See for instance John Tirpak. “World Market Forces Improved Military Exports.” 
Aviation Week & Space 
Technology. February 14, 1994. John Morrocco. “No JAST Prototypes to Fly Until After 2000.” 
Aviation Week & 
Space Technology. December 13, 1993, and “Brits Visit JAST to Position for Next Round of Contracts.” 
Aerospace 
Daily. June 1, 1994. 
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single engine, multirole fighter) to perpetuate U.S. dominance in this market. Foreign 
participation in the JSF program was sought to defray development costs, but also to “prime the 
pump” for export.88 
A key question appears to be whether the JSF will achieve the same export success with one 
engine-type as it might with two. Some argue that the F-16’s export success is directly 
attributable to having two engine types: “The F-16 became a much more exportable aircraft when 
GE and Pratt were killing each other in the international market. So, if you are selling these JSF’s 
and you have got one engine ... that reduces the attractiveness to these international customers ... 
”89 Singapore and South Korea have both selected the GE F110 engine to power their F-15 
Eagles, and Saudi Arabia is giving serious consideration to re-engining its F-15s with GE 
engines. These decisions contrast with U.S. Air Force decisions to power its 
Eagles with P&W 
engines. Further, while GE engines power a large fraction of USAF F-16 
Falcons, P&W engine 
sales to international F-16 customers have dominated GE sales. This background lends credence 
to the suggestion that competition in engine selection can enhance U.S. fighter aircraft export 
success. 
Would cancelling the F136 and the attendant competition with the F135 adversely affect potential 
future advances in engine performance, reliability, and maintainability? If so, might this be at the 
expense of U.S. competitiveness? Some of those who participated in, or studied the “Great 
Engine War” assert that the competition between GE and P&W made 
both companies better and 
“proved invaluable to future engine development.”90 
The economic stakes in international fighter engine competition appear to be high. U.S. 
companies face competition from France, Sweden, Russia, and a European consortium of 
companies, and it is argued that some of these governments heavily subsidize their aerospace 
industries. Aerospace is an important export for the United States. Despite this competition, 
aerospace has at times provided the U.S. economy with its highest trade surplus.91 Many 
observers project that the size of the international market for fighter aircraft will remain high for 
the next decade, after which it may peak and then decline.92 
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The final point one might make about the potential termination of the F136 pertains to acquisition 
reform, or “good government.”93 Congress has held multiple hearings on defense acquisition 
                                                                 
88 “Australia, Belgium Enter Joint Strike Fighter Program as EMD Partners,” Inside the Air Force, April 21, 2000. 
89 Carlo Munoz. “Congress, Defense Department Square Off Over Second JSF Engine.” 
Inside the Air Force. March 3, 
2006. 
90 Maj. John Nix and Maj. Riley Shelnutt. “Behind the Alternate Fighter Engine Competition.” 
Aerospace America. May 1984. 
91 “The trade surplus generated by aerospace foreign trade in 2005 totaled $37 billion. With an $8.4 billion increase in 
exports and $2 billion rise in imports, the industry’s trade surplus expanded $6.4 billion. The aerospace trade balance, 
before its sharp rise this year and last, had fallen $14 billion from its $41 billion peak in 1998 due to $12 billion fewer 
exports and $2 billion more imports. In 2004, the latest year of comparative data, the U.S. aerospace industry posted the 
highest trade balance of all industry categories. (emphasis added).” 
2005 Year-End Review and 2006 Forecast—An 
Analysis. David H. Napier, Director, Aerospace Research Center. Aerospace Industries Association. 
92 “Market Overview: Fighter/Attack Aircraft.” 
World Military & Civil Aircraft Briefing. Teal Group Inc. (Fairfax, VA) 
February 2006. 
93 For example, Air Land Subcommittee of the Senate Armed Services Committee, November 15, 2005, and Readiness 
(continued...) 
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reform, and members have consistently expressed concern about perceived shortcomings in the 
current acquisition system, or a lack of personal accountability in acquisition decisions. As 
Congress has tried to determine and correct the root causes of growing weapon system cost 
growth it has heard from witnesses a litany of problems such as funding instability, unrealistic 
requirements, poorly structured contractor incentives, too much reliance on lead system 
integrators, and the improper use of commercial contracts to purchase military items. 
In this context, many observers believe that the competition during the “Great Engine War” 
conferred a number of benefits to government that today’s acquisition officials would have a 
difficult time duplicating. For example, prior to the first contract award, the Air Force demanded 
that GE and P&W provide six years of cost projections to include the production of engines, but 
also the price of support equipment, spare engines, technical data and dual sourcing data and 
second sourcing data for operations and support. The contractors were held to these cost 
projections for six years: the Air Force let six years of firm-fixed price, or “not-to-exceed” 
contracts from the first production lot. Prior to the “Great Engine War,” government had 
succeeded in negotiating firm-fixed price contracts only after the engine had been operating in the 
field for several years. Never before had contractors agreed to provide cost projections into the 
future, and contracts were typically for production only, not O&S work. 
By requiring GE and P&W to compete for annual production and O&S work, DOD may have 
reaped a number of benefits such as better contract terms and conditions, better warranties to 
assure engine quality, consistency, and long term stability of support.94 Further, after competition 
was introduced, the incumbent (P&W) offered “engine improvements to the Air Force earlier than 
the Air Force had been led to expect without the competition.”95 To avoid potential disruptions in 
production, and to protect itself against price gouging, DOD “required (each contractor) to 
provide his plan for providing dual sources of critical parts. These separately priced options in the 
proposals would allow the Government to reprocure spare parts from sources other than the prime 
contractors.”96 
Successfully orchestrating the “Great Engine War” in the mid-1980s required a considerable 
amount of effort and skill by Air Force leaders. It is unclear whether today’s environment would 
allow, or whether DOD leadership would be able to exploit the JSF Alternate Engine competition 
as effectively as Air Force leaders in the past. 
                                                                 
(...continued) 
and Management Support Subcommittee of the Senate Armed Services Committee, November 9, 2005. 
94 U.S. Congress, House, Committee on Armed Services, 
Air Force Alternative Fighter Engine, Hearings before the 
Subcommittee on Procurement and Military Nuclear systems, 98th Cong. 2nd Sess., March 8, 1984. 
95 Robert W. Drewes. 
The Air Force and the Great Engine War. NDU Press (Washington, DC) 1987. 
96 Prepared Statement of Hon. Thomas Cooper. 
Air Force Alternative Fighter Engine, Hearings OpCit. 
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Source: PMAG 2002. 
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Source: JSF Engine Second Source Executive Summary. Whitney, Bradley, and Brown, December 20, 2006. 
 
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Christopher Bolkcom 
   
Specialist in Military Aviation 
cbolkcom@crs.loc.gov, 7-2577 
 
 
 
 
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