Airworthiness Directive · Amendment 39-22016 · Turbine section
Pratt & Whitney Canada Corp. Turboprop Engines
This AD applies to all Pratt & Whitney Canada Corp. PT6A-34, -34B, -34AG, -114, and -114A model turboprop engines.
The FAA is adopting a new airworthiness directive (AD) for all Pratt & Whitney Canada Corp. (P&WC) PT6A-34, -34B, -34AG, -114, and - 114A model turboprop engines. 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 (IFSD) of the engine. This AD requires replacement of certain CT vanes. This AD also requires removal from service of certain CT blades when these blades have been operated with certain CT vanes. The FAA is issuing this AD to address the unsafe condition on these products.
(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]
After the effective date of this AD, do not install on any engine a CT vane, P/N 3029051, 3032151, or 3123001, that was repaired in accordance with STI 72-50-254.
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.
