EASA AD 2025-0003
Engine — Low Pressure Turbine — Stage 4 and Stage 5 Disks — Replacement
Summary
EASA Airworthiness Directive 2025-0003 is an airworthiness directive addressing the replacement of Low Pressure Turbine Stage 4 and Stage 5 disks on CFM International LEAP-1A, LEAP-1B, and LEAP-1C engines. These engines are installed on aircraft including Airbus A319, A320, A321, Boeing 737-8, 737-8200, 737-9, and COMAC C919. The directive identifies specific affected disk part numbers and serial numbers requiring replacement to ensure continued airworthiness.
What Changed
EASA Airworthiness Directive 2025-0003 introduces mandatory replacement requirements for certain Low Pressure Turbine Stage 4 and Stage 5 disks identified by part and serial numbers on LEAP-1A, LEAP-1B, and LEAP-1C engines. It prohibits the installation of affected parts from the effective date and requires replacement during the next piece part exposure or before exceeding specified thresholds in the applicable CFM service bulletins.
Why It Matters
This directive is critical for aviation professionals because the affected turbine disks may have reduced material properties due to non-conforming grain size, which could lead to part failure, high-energy debris release, or in-flight engine shutdown. Compliance ensures the safety and reliability of the engines, preventing potential damage to aircraft and maintaining regulatory compliance for operators and maintenance organizations.
What To Do
Operators and maintenance organizations must identify if their LEAP-1A, LEAP-1B, or LEAP-1C engines have affected turbine disks installed. For Group 1 engines with affected parts, replacement must be performed at the next piece part exposure or before exceeding the thresholds specified in the relevant CFM service bulletin, whichever occurs first, and no affected parts may be installed from 21 January 2025 onward. Compliance with the instructions in the applicable CFM service bulletins is mandatory.