Airworthiness Directive · Amendment 39-21612 · Engine
GE Aviation Czech s.r.o. (Type Certificate Previously Held by WALTER Engines a.s., Walter a.s., and MOTORLET a.s.) Turboprop Engines
Superseded. A later AD replaced this one: AD 2024-02-04. Comply with the one in force.
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.
The FAA is adopting a new airworthiness directive (AD) for all GE Aviation Czech s.r.o. (GEAC) M601D-11, M601E-11, M601E-11A, M601E- 11AS, M601E-11S, and M601F model turboprop engines. 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 equivalent flight cycles (FCs) of critical parts and errors with certain part numbers (P/ Ns). The manufacturer also determined that the life limit of a certain compressor case is not listed in the ALS section of the applicable EMM. This AD requires recalculating the life of critical parts and, depending on the results of the recalculation, replacement of these critical parts. This AD also requires replacement of a certain compressor case. The FAA is issuing this AD to address the unsafe condition on these products.
(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.
After the effective date of this AD, do not install onto any airplane an engine with a critical part having a recalculated life that exceeds the critical part's life limit as specified in the Airworthiness Limitation Section (ALS) of the applicable EMM.
The reporting requirement in the Accomplishment Instructions, paragraph 2.2.1.4., of the ASB, is not required by this AD.
(1) For the purpose of this AD, a “critical part” is an engine part listed in paragraph 2.3.1, Table B—List of Critical Parts and the Accelerating Factor, of the ASB.
(2) For the purpose of this AD, “recalculated life” is the consumed life of the critical part using the recalculation required by (g)(1) of this AD.
(3) For the purpose of this AD, where the ASB says the “applicable Airworthiness Limitation Section” use the following:
(i) For affected model engines M601D-1, M601D-11, M601D-11NZ, M601D-2, M601Z: “the ALS section of GE Aviation Engine Maintenance Manual 0982309.”
(ii) For affected model engines M601E-11, M601E-11S, M601E-11A, M601E-11AS, M601F, M601FS: “the ALS section of GE Aviation Engine Maintenance Manual 0982302.”
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Engines
