Airworthiness directives › 2022-08-13
AD 2022-08-13 Airworthiness Directives; Pratt & Whitney Canada Corp. Turboprop Engines
Applicability*9
This AD applies to all Pratt & Whitney Canada Corp. PT6A-34, -34B, -34AG, -114, and -114A model turboprop engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 250 flight hours (FHs) or 270 days after the effective date of this AD, whichever occurs first: (i) Remove from service any CT vane, part number (P/N) 3029051, 3032151, or 3123001, repaired in accordance with Southwest Turbine Inc. (STI) Repair Specification STI 72-50-254 (STI 72-50-254) and replace with a non-STI 72-50-254 repaired CT vane. (ii) Remove from service any CMSX-6 CT blade that has been operated on an affected engine with any CT vane repaired in accordance with STI 72-50-254. (2) [Reserved]
Unsafe condition
This AD was prompted by several reports of low-time fractures of compressor turbine (CT) blades resulting in loss of power or in-flight shutdown of the engine. The FAA is issuing this AD to prevent failure of the CT blade. The unsafe condition, if not addressed, could result in failure of the engine, in-flight shutdown, and loss of the airplane.
Affected ADs
None.
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