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Airworthiness directives › 2026-02-08

AD 2026-02-08 Airworthiness Directives; CFM International, S.A. Engines

2026-02-25
2026-01-21
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Engine
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Models named: LEAP-1A23, LEAP-1A24, LEAP-1A24E1, LEAP-1A26, LEAP-1A26E1, LEAP-1A26CJ, LEAP-1A29, LEAP-1A29CJ, LEAP-1A30, LEAP-1A32. Read the applicability below — it usually turns on serial or part numbers too.

Applicability*9

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.

Compliance

Comply with this AD within the compliance times specified, unless already done.

Required actions

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.

Unsafe condition

This AD was prompted by aborted takeoffs after engines did not advance to the desired takeoff fan speed due to icing in the pressure sensor line. The FAA is issuing this AD to prevent icing in the pressure sensor lines and inaccurate pressure sensor readings. The unsafe condition, if not addressed, could result in loss of engine thrust control and reduced control of the airplane.

Affected ADs

This AD replaces AD 2018-19-16, Amendment 39-19416 (83 FR 50818, October 10, 2018) (AD 2018-19-16).

Read the original on the Federal Register →

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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1