FAA Orders Software and Parts Upgrades for CFM LEAP-1A Engines
Published Date: 1/21/2026
Rule
Summary
If you own or operate CFM LEAP-1A engines, get ready for some important updates! The FAA is requiring new software, wiring harnesses, and a heated pressure part to stop freezing problems and keep engines running safely. These changes kick in February 25, 2026, so plan ahead to avoid delays or extra costs.
Analyzed Economic Effects
4 provisions identified: 1 benefits, 3 costs, 0 mixed.
Mandatory fixes to stop engine freezing
If you own or operate the listed CFM LEAP-1A engines, you must install new FADEC and PHM software, replace certain HJ6A/HJ6B wiring harnesses, and replace the pressure subsystem (PSS) with a heated PSS at the next engine shop visit after February 25, 2026. The rule targets LEAP-1A23 through LEAP-1A35A model variants and is meant to prevent icing in pressure sensor lines that caused aborted takeoffs and could lead to loss of engine thrust control.
Heated PSS replacement is very expensive
Replacing the pressure subsystem (PSS) with the heated PSS (P/N 2474M65P08 or later) costs an estimated $186,035 per engine (1 work-hour at $85 plus $185,950 parts). The FAA estimates this AD affects 306 engines on U.S. registry, giving a total estimated PSS replacement cost to U.S. operators of $56,926,710.
Harness replacements add significant expense
For engines with the older harnesses, you must remove HJ6A P/N 362-085-905-0 and HJ6B P/N 362-086-004-0 and install HJ6A P/N 362-085-906-0 and/or HJ6B P/N 362-086-005-0 (or later). The FAA estimates harness replacement costs $57,595 per engine (1 work-hour at $85 plus $57,510 parts) and totals $17,624,070 for U.S. operators across 306 engines.
Software update required at low labor cost
At the next engine shop visit you must install EEC FADEC software P/N 2590M00P13 version L1A0850 (or later) and PHM software P/N 2784M64P08 version PL1A0850 (or later). The FAA estimates the software install is 1 work-hour at $85 and $0 parts, or $85 per engine, with a total U.S. cost estimate of $26,010 for 306 engines.
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