The Federal Aviation Administration (FAA) has proposed to supersede Airworthiness Directives (ADs) 2022–13–16 and 2022-14-12, which apply to all GE Aviation Czech s.r.o. (GEAC) (type certificate previously held by WALTER Engines a.s., Walter a.s., and MOTORLET a.s.) Model M601 engines.
AD 2022-13-13 (issued June 2022) requires revising the airworthiness limitations section (ALS) of the existing engine maintenance manual (EMM) to incorporate a visual inspection of the centrifugal compressor case for cracks. AD 2022-14-12 (issued July 2022) requires calculating the accumulated life and, if necessary, replacing the propeller shaft for certain model engines.
Since the FAA issued AD 2022–13–16 and AD 2022–14–12, the manufacturer revised the ALS of the existing EMM to introduce new and more restrictive tasks and limitations, expand the applicability to all Model M601 engines, and incorporate certain requirements addressed by AD 2021–13–07 (issued June 2021) and AD 2023–01–10 (issued February 2023), which prompted this proposed AD.
This
proposed AD would require revising the ALS of the existing EMM and the operator's existing approved engine maintenance or inspection program, as applicable, to incorporate new and more restrictive tasks and limitations, as specified in a European Union Aviation Safety Agency
(EASA) AD 2023-0020.
Comments on this proposed AD must be submitted by December 29, 2023.