Is AD 2012-09-10 a recurring Airworthiness Directive?

No — AD 2012-09-10 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2012-09-10

Q: Which aircraft does AD 2012-09-10 apply to?

AD 2012-09-10 applies to Pratt & Whitney Canada — models PT6A-38, PT6A-41, PT6A-42, PT6A-42A, PT6A-61, PT6A-64, PT6A-66, PT6A-66B. Serial/part conditions may narrow it to specific aircraft.

one-time

Official AD 2012-09-10 · FR doc 2012-11057 · 2012-05-08 · turboprop engine

Airworthiness Directives; Pratt & Whitney Canada Turboprop Engines

What this AD requires

We are adopting a new airworthiness directive (AD) for certain Pratt & Whitney Canada PT6A-38, -41, -42, -42A, -61, -64, -66, -66B, - 110, -112, -114, -114A, -121, -135, and -135A series turboprop engines. This AD requires removal from service of certain part manufacturer approval (PMA) replacement Timken Alcor Aerospace Technologies, Inc. (TAATI) first stage sun gears and planet gears installed in the reduction gearbox. This AD was prompted by failures of certain first stage sun gears manufactured by TAATI. We are issuing this AD to prevent failure of the sun gear and planet gears which will result in an engine in-flight shut down, possible uncontained engine failure, aircraft damage, and serious injuries.

Which aircraft AD 2012-09-10 applies to

MakesPratt & Whitney Canada

ModelsPT6A-38, PT6A-41, PT6A-42, PT6A-42A, PT6A-61, PT6A-64, PT6A-66, PT6A-66B, PT6A-110, PT6A-112, PT6A-114, PT6A-114A, PT6A-121, PT6A-135, PT6A-135A, PT6A

Part-conditional — E3028456, E3037304, E3101455-02, E3101525-02.

Applies only to engines that had maintenance done to the power section module involving first stage sun gear or planet gear replacement since December 22, 2008, AND that have any of the listed Timken Alcor Aerospace Technologies (TAATI) PMA replacement first stage sun gears or planet gear sets installed (all serial numbers of these part numbers).

Whether AD 2012-09-10 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 2012-09-10 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.