EASA AD 26-006
Engine — Full Authority Digital Electronic Control Software — Replacement
Summary
EASA Airworthiness Directive 26-006 is a proposed directive addressing CFM International LEAP-1A engines installed on Airbus A319, A320, and A321 aircraft. It mandates modifications to the Full Authority Digital Electronic Control (FADEC) software, Pressure Sub System (PSS), and engine wiring harness to prevent engine thrust issues during takeoff. The directive applies to all serial numbers of specified LEAP-1A engine models.
What Changed
This directive supersedes EASA AD 2018-0216 and introduces updated requirements including replacement of affected PSS with heated versions, updated FADEC and Prognostic Health Monitoring software, and replacement of engine wiring harnesses. It requires these modifications to be completed during the next engine shop visit after the effective date. The changes improve detection and prevention of water accumulation faults in the FADEC system.
Why It Matters
The directive addresses a critical safety issue where water accumulation in the FADEC PSS could cause engine thrust loss during takeoff, potentially compromising aircraft control. Compliance ensures enhanced engine reliability and safety for operators and maintenance organizations. It also standardizes software and hardware upgrades to prevent recurring faults and reduce operational disruptions.
What To Do
Operators must replace affected PSS, EEC software, and engine wiring harnesses during the next engine shop visit following the directive's effective date. Installation of affected parts on any engine is prohibited after modification or from the effective date for unaffected engines. Stakeholders should refer to the specified CFM service bulletins for detailed modification instructions and comply before the consultation closure date of 13 February 2026.
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