The Air Force is to require the delivery of engines that reduce instances of Mission Impaired Capability Awaiting Parts (MICAP).

On the support side, the competition “is designed to solve key fleet-level issues by requiring a newer engine with improved supportability, directly addressing and decreasing supply MICAPs,” the notice said.

The F-15EX has the F110-GE-129 engine by GE Aerospace. The F-16 Block 70 uses the F110, and the F-16 Block 72 has the Pratt & Whitney F100-PW-229 engine. The engines generate about 29,000 pounds of thrust.

The Engine Core Upgrade for the F135 engine by Pratt & Whitney is to have a critical design review later in August, followed by ground testing late next year and flight testing in 2030. The F135 powers Lockheed Martin’s F-35 fighter.