
The U.S. Air Force's fiscal 2024 budget asks for $245 million for Raytheon Technologies' [RTX] F135 Engine Core Upgrade (ECU) for the Lockheed Martin [LMT] F-35 and cancels a new adaptive cycle engine for the fighter, but DoD has yet to determine what power and thermal management system (PTMS) it will use for ECU, according to a new GAO report, F-35 Joint Strike Fighter: More Actions Needed to Explain Cost Growth and Support Engine Modernization Decision (GAO-23-106047). The F135 will…