Airworthiness Directive · Amendment 39-23244 · Engine controls
CFM International, S.A. Engines
This AD applies to CFM International, S.A. (CFM) Model LEAP-1A23, LEAP-1A24, LEAP-1A24E1, LEAP-1A26, LEAP-1A26E1, LEAP-1A26CJ, LEAP-1A29, LEAP-1A29CJ, LEAP-1A30, LEAP-1A32, LEAP-1A33, LEAP-1A33B2, and LEAP-1A35A engines.
The FAA is superseding Airworthiness Directive (AD) 2018-19-16 for all CFM International, S.A. (CFM) Model LEAP-1A23, -1A24, -1A24E1, -1A26, -1A26E1, -1A26CJ, -1A29, -1A29CJ, -1A30, -1A32, -1A33, -1A33B2, and -1A35A engines with certain full authority digital engine control (FADEC) and prognostic health monitoring (PHM) software installed. AD 2018-19-16 required removing certain FADEC and PHM software and installing versions eligible for installation. Since the FAA issued AD 2018-19-16, the manufacturer has developed a new pressure subsystem (PSS) with a heater element to evaporate potential moisture on the PSS manifold/transducer interface and prevent freezing at low temperature. This AD requires replacing certain FADEC and PHM software with new versions that are eligible for installation, replacing certain harnesses with newly designed harnesses, and replacing the PSS with a newly designed heated PSS. The FAA is issuing this AD to address the unsafe condition on these products.
At the next engine shop visit after the effective date of this AD, do the following actions:
(1) Install electronic engine control (EEC) full authority digital electronic control (FADEC) software having part number (P/N) 2590M00P13, version L1A0850, or later approved version; and prognostic health monitoring (PHM) software having P/N 2784M64P08, version PL1A0850, or later approved version.
Note 1 to paragraph (g)(1): The software release that includes EEC FADEC software P/N 2590M00P13, version L1A0850, and PHM software P/N 2784M64P08, version PL1A0850, is commonly referred to as “FCS8.5.” Guidance for replacing the EEC FADEC software and PHM software may be found in CFM Service Bulletin LEAP-1A-73-00-0050-01A-930A-D, Issue 001-00, dated January 03, 2024.
(2) For engines with an installed HJ6A harness having P/N 362-085-905-0 (significant item number (SIN) 65004), remove the HJ6A harness from service and replace with an HJ6A harness having P/N 362-085-906-0, or later approved P/N.
Note 2 to paragraph (g)(2): This note applies to paragraphs (g)(2) and (g)(3). Guidance for replacing the HJ6A harness P/N 362-085-905-0 and the HJ6B harness P/N 362-086-004-0 with an HJ6A harness P/N 362-085-906-0 or an HJ6B harness P/N 362-086-005-0, or later approved P/N, as applicable, may be found in CFM Service Bulletin LEAP-1A-73-00-0042-01A-930A-D, Issue 003-00, dated July 11, 2024.
(3) For engines with an installed HJ6B harness having P/N 362-086-004-0 (SIN 65005), remove the HJ6B harness from service and replace with an HJ6B harness having P/N 362-086-005-0, or later approved P/N.
(4) For engines with an installed pressure subsystem (PSS) having P/N 2474M65P05 (vendor identification number (VIN) 261811055-0303), remove the PSS from service and replace with a heated PSS having P/N 2474M65P08 (VIN 261811055-0410), or later approved P/N.
Note 3 to paragraph (g)(4): Guidance for replacing the PSS P/N 2474M65P05 with a heated PSS P/N 2474M65P08, or later approved P/N may be found in CFM Service Bulletin LEAP-1A-73-00-0051-01A-930A-D, Issue 002-00, dated January 03, 2024.
For the purpose of this AD, an “engine shop visit” is the induction of the engine into the shop for maintenance involving the separation of major mating engine flanges, except for the separation of engine flanges solely for the purposes of transportation without subsequent engine maintenance.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
