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Airworthiness Directive 2002-23-13

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Official AD 2002-23-13 · FR doc 02-29671 · 2002-11-26 · turboprop engine

Airworthiness Directives; Pratt & Whitney Canada PT6A Series Turboprop Engines

What this AD requires

This amendment adopts a new airworthiness directive (AD), that is applicable to Pratt & Whitney Canada PT6A series turboprop engines that have certain turbine exhaust ducts that were modified by a number of different companies. This amendment requires inspections for low- quality welds and cracks of a large population of turbine exhaust ducts. This amendment is prompted by reports of cracks along the weld seams of certain turbine exhaust ducts. The actions specified by this AD are intended to prevent failure of the turbine exhaust duct due to cracking that could result in possible separation of the reduction gearbox and propeller from the engine, and possible loss of control of the airplane.

Which aircraft AD 2002-23-13 applies to

MakesPratt & Whitney Canada
ModelsPT6A-6, PT6A-6A, PT6A-6B, PT6A-20, PT6A-20A, PT6A-20B, PT6A-21, PT6A-25, PT6A-25A, PT6A-25C, PT6A-27, PT6A-28, PT6A-34, PT6A-34AG, PT6A-34B, PT6A-36, PT6A-135, PT6A-135A, PT6A-11, PT6A-11AG, PT6A-15AG, PT6A-110, PT6A-112, PT6A

Applies to the turbine exhaust duct near flange 'A' on the listed PT6A models; weld-quality inspection and crack-length acceptance criteria per P&WC SB PT6A-72-1610 Rev 2 (PT6A-6/-6A/-6B/-20/-20A/-20B/-21/-25/-25A/-25C/-27/-28/-34/-34AG/-34B/-36/-135/-135A) or SB PT6A-72-12173 dated January 24, 2002 (PT6A-11/-11AG/-15AG/-110/-112); no action required if the engine has not been overhauled and the duct has had no repair shop visit; to prevent gearbox/propeller separation.

Whether AD 2002-23-13 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

How AD compliance is recorded

A valid compliance record (14 CFR 43.9) states:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.
Date — When the work was done.
Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.
Signature & certificate — The A&P/IA who returned it to service, with certificate number.
Is AD 2002-23-13 complied with on your aircraft?

Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.

Look up a tail number →Read the full directive (Federal Register)

Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.