Is AD 2021-15-12 a recurring Airworthiness Directive?

No — AD 2021-15-12 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2021-15-12 apply to?

AD 2021-15-12 applies to Pratt & Whitney Canada — models PW210A, PW210S, PW200. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-15-12

one-time

Official AD 2021-15-12 · FR doc 2021-16544 · 2021-08-05 · turboshaft engine

Airworthiness Directives; Pratt & Whitney Canada Corp. Turboshaft Engines

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for all Pratt & Whitney Canada Corp. (P&WC) PW210A and PW210S model turboshaft engines. This AD was prompted by a report from the manufacturer that the Automated Damage Tracking System (ADTS) may under-count the number of cycles accrued by the impeller and the high-pressure compressor (HPC) rotor. This AD requires use of the manual low-cycle fatigue (LCF) counting method in place of the ADTS counting method to determine the number of cycles accrued by the impeller and HPC rotor. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-15-12 applies to

MakesPratt & Whitney Canada

ModelsPW210A, PW210S, PW200

Whether AD 2021-15-12 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 2021-15-12 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.