B-52 Re-Engining Program Begins
INSIGHTi
B-52 Re-Engining Program Begins
Updated September 27, 2021
On September 24, 2021, the U.S. Air Force awarded a contract to Rolls-Royce, Indianapolis, IN, for 608
new engines to replace the TF33 engines powering the B-52H Stratofortress bomber fleet, in a contract
running up to 17 years. The initial contract is for $500.9 mil ion, but with spare engines, technical data,
support equipment, and sustainment, the contract could ultimately be worth $2.6 bil ion, and may include
650 engines. Rolls-Royce has 18 months to deliver initial engines.
The Air Force currently operates 76 B-52Hs, the most recent of which was built in the 1960s. The Air
Force now expects to operate them until 2050. The last TF33 engine was built in 1985. (For more on the
B-52 fleet, see CRS Report R43049, U.S. Air Force Bomber Sustainment and Modernization: Background
and Issues for Congress.)
Figure 1. Engine Mounting on B-52
Source: U.S. Air Force
This re-engining effort (official y the Commercial Engine Replacement Program, or CERP) had been in
the works for some time, as the Air Force had announced its plans to extend the B-52s’ service into at
least the 2040s, and had held an industry day on December 12, 2017, to share information and solicit
vendors for the program. Boeing, the B-52 prime contractor, even produced an animated video touting the
benefits of re-engining.
Congressional Research Service
https://crsreports.congress.gov
IN11413
CRS INSIGHT
Prepared for Members and
Committees of Congress
link to page 3 Congressional Research Service
2
The request for proposals, released May 19, 2020, cal ed for engines that are military-specific derivatives
of existing commercial engines. Given the specification that the eight engines on each B-52 were to be
replaced by eight new engines (as opposed to, perhaps, four larger engines), the expected candidates were
variants of engines used for business jets and regional airliners, as those best approximate the physical
size of the TF33s to be replaced while offering considerably improved fuel efficiency.
CERP’s principal goals are to reduce the fuel cost of operating the B-52 fleet while increasing reliability.
The engines under consideration provide similar thrust to the existing TF33s but are based on much more
recent designs. Also, as their commercial versions are in current service around the world, they can be
supported more easily using the commercial logistics infrastructure. Most commercial equivalents of the
TF33 have been retired, as have most TF33s used in other Air Force aircraft.
Potential vendors had already placed their candidate engines on display at public conferences, and are
believed to include
GE Aviation (Evendale, OH), offering variants of the CF34 and Passport engines;
Rolls-Royce (Indianapolis, IN) proposing a modified BR725;
Pratt & Whitney (East Hartford, CT) with a militarized PW800.
The Air Force awarded the indefinite delivery/indefinite quantity contract as a rapid prototyping effort
under what is known as Section 804 acquisition authority. Use of this authority has attracted controversy
among some Members of Congress. In the conference report accompanying the FY2020 National Defense
Authorization Act (S. 1790), Congress required that the Air Force submit a report detailing the acquisition
and logistics strategies, key performance parameters, and other aspects of CERP, and withheld 25% of the
$175 mil ion pending release of that report. Although the Air Force has not announced whether the report
has been submitted, the CERP solicitation and its appendices included the data requested in the NDAA
conference report.
The competition was to be based on best value, with technical risk and price given approximately equal
weight. Specific evaluation factors are shown in Figure 2.
Congressional Research Service
3
Figure 2. Best Value Factors
Source: U.S. Air Force solicitation, “B-52 CERP Commercial Engine Replacement Program (CERP) Engine Contract,”
Appendix F, available at https://go.usa.gov/xwqey.
Author Information
Jeremiah Gertler
Specialist in Military Aviation
Disclaimer
This document was prepared by the Congressional Research Service (CRS). CRS serves as nonpartisan shared staff
to congressional committees and Members of Congress. It operates solely at the behest of and under the direction of
Congress. Information in a CRS Report should not be relied upon for purposes other than public understanding of
information that has been provided by CRS to Members of Congress in connection with CRS’s institutional role.
CRS Reports, as a work of the United States Government, are not subject to copyright protection in the United
States. Any CRS Report may be reproduced and distributed in its entirety without permission from CRS. However,
as a CRS Report may include copyrighted images or material from a third party, you may need to obtain the
permission of the copyright holder if you wish to copy or otherwise use copyrighted material.
IN11413 · VERSION 4 · UPDATED
Congressional Research Service
4
IN11413 · VERSION 4 · UPDATED