AD Issued for M601 Compressor Case

The FAA is adopting a new airworthiness directive (AD 2024-06-02) for GE Aviation Czech (GEAC) Model M601 engines. A crack on the centrifugal compressor case mount pad weld area was reported on an engine, leading to an unscheduled engine removal. Further investigation identified a non-conforming weld in the location of the failure (lack of welding penetration).

To address this potential unsafe condition, GEAC issued ASB SB-000471/00 on February 2, 2024 to provide instructions for a one-time detailed visual inspection of affected centrifugal compressor cases, having Part Number (P/N) M601-154.55 or P/N M601-154.65.

The European Union Aviation Safety Agency issued EASA AD 2024-0040-E on February 8, 2024, directing compliance with the above referenced ASB. 

FAA AD 2024-06-02, effective April 11, 2024, directs compliance with the EASA AD within 10 flight hours or 30 days from the effective date, whichever comes first. If any crack is detected on an affected part, the AD requires replacement of the compressor case before further flight.