# 2026-01094: FAA Orders Software and Parts Upgrades for CFM LEAP-1A Engines

2026-01094, Airworthiness Directives; CFM International, S.A. Engines, is a Federal Register rule from Transportation Department, Federal Aviation Administration published 2026-01-21, effective 2026-02-25 (as of 2026-06-11).

- Canonical: https://policyrisk.com/federal-register/2026-01094
- As of: 2026-06-11
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-01094
- Title: Airworthiness Directives; CFM International, S.A. Engines
- Type: Rule
- Agencies: Transportation Department; Federal Aviation Administration
- Citation: 91 FR 2465
- Published: 2026-01-21
- Effective: 2026-02-25
- Comments close: not stated
- Significant: no
- Touches household money: no
- Regulation identifier numbers: 2120-AA64
- Last updated: 2026-06-11

## In one line

FAA Orders Software and Parts Upgrades for CFM LEAP-1A Engines

## 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.

## Abstract

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.

## Effects PRIA read

- Mandatory fixes to stop engine freezing: benefit, high. 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-1A…
- Heated PSS replacement is very expensive: cost, high. 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 $5…
- Harness replacements add significant expense: cost, high. 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,…
- Software update required at low labor cost: cost, low. 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 $…

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## Sources
- [2026-01094 on federalregister.gov](https://www.federalregister.gov/documents/2026/01/21/2026-01094/airworthiness-directives-cfm-international-sa-engines)
- [2026-01094 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-01-21/pdf/2026-01094.pdf)

## Related
- [Previous: 2026-01092, Implementation of the National Environmental Policy Act](https://policyrisk.com/federal-register/2026-01092)
- [Next: 2026-01117, Wagner-Peyser Act Staffing, Delay of Merit Staffing Compliance Date](https://policyrisk.com/federal-register/2026-01117)
- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2026-01094 (as of 2026-06-11).