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Air Force

F-35 Program: F135 ECU and PTMS ‘Must Be Designed Together’

Frank Wolfe

Wednesday, May 31st, 2023

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F-35 Program: F135 ECU and PTMS ‘Must Be Designed Together’

Two U.S. Air Force F-35A Lightning IIs assigned to the 48th Fighter Wing perform a pass over Royal Air Force Lakenheath, England, on April 16, 2022 (U.S. Air Force Photo)

The F-35 Joint Program Office (JPO) considers the planned Engine Core Upgrade for the Raytheon Technologies' [RTX] Pratt & Whitney F135 engine and a new or upgraded Power and Thermal Management System (PTMS) as a single effort. Honeywell [HON] builds the PTMS as a subcontractor to Lockheed Martin [LMT], the F-35 prime. The PTMS uses air pressure from the engine to cool aircraft subsystems and enables main engine start, emergency power, cockpit conditioning, equipment cooling, and some electrical power. A…

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