Airworthiness directives › 2021-13-07
AD 2021-13-07 Airworthiness Directives; GE Aviation Czech s.r.o. (Type Certificate Previously Held by WALTER Engines a.s., Walter a.s., and MOTORLET a.s.) Turboprop Engines
Applicability*9
This AD applies to GE Aviation Czech s.r.o. (GEAC) M601D-11, M601E-11, M601E-11A, M601E-11AS, M601E-11S, and M601F model turboprop engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For all affected GEAC model turboprop engines, within one FC after the effective date of this AD, perform all actions in the Accomplishment Instructions, paragraphs 2.1 through 2.3, of GE Aviation Czech Alert Service Bulletin (ASB) ASB-M601F-72-00-00-0057 [00], ASB-M601E-72-00-00-0106 [00], ASB-M601D-72-00-00-0075 [00], and ASB-M601Z-72-00-00-0057 [00] (single document; formatted as service bulletin identifier [revision number]) (the ASB), dated May 7, 2021. (2) For GEAC M601E-11, M601E-11A, and M601F model turboprop engines listed in Attachment 1, Group 1 Engines Serial Numbers, in the ASB, before the recalculated life exceeds the critical part's life limit or within one FC after the effective date of this AD, whichever occurs later, replace each critical part. (3) For GEAC M601D-11, M601E-11AS, and M601E-11S model turboprop engines, before the recalculated life exceeds the critical part's life limit or within 30 days after the effective date of this AD, whichever occurs later, replace each critical part. (4) For GEAC M601E-11, M601E-11A, M601E-11AS, and M601E-11S model turboprop engines, before the compressor case, P/N M601-154.61, accumulates 11,000 equivalent FCs or within 350 flight hours from the effective date of this AD, whichever occurs first, remove the compressor case from service and replace it with compressor case, P/N M601-154.6 or P/N M601-154.65.
Unsafe condition
This AD was prompted by the manufacturer finding errors in the Airworthiness Limitation Section (ALS) of the Engine Maintenance Manual (EMM), including errors in the formula to determine the consumed equivalent flight cycles (FCs) of critical parts and errors with certain part numbers (P/Ns). The manufacturer also determined that the life limit of compressor case, P/N M601-154.61, installed on certain GEAC M601E model engines is not listed in the ALS of the applicable EMM. The FAA is issuing this AD to prevent the failure of the engine. The unsafe condition, if not addressed, could result in uncontained release of a critical part, damage to the engine, and damage to the airplane.
Affected ADs
None.
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