Is AD 2010-21-17 a recurring Airworthiness Directive?

No — AD 2010-21-17 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2010-21-17 apply to?

AD 2010-21-17 applies to Pratt & Whitney — models JT8D-9, JT8D-9A, JT8D-11, JT8D-15, JT8D-17, JT8D-17R, JT8D. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2010-21-17

one-time

Official AD 2010-21-17 · FR doc 2010-25391 · 2010-10-08 · turbine engine

Airworthiness Directives; Pratt & Whitney JT8D-9, -9A, -11, -15, -17, and -17R Turbofan Engines

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for Pratt & Whitney (PW) JT8D-9, -9A, -11, -15, -17, and -17R turbofan engines. This AD requires overhauling fan blade leading edges at the first shop visit after 4,000 cycles-in-service (CIS) since the last total fan blade overhaul was performed. This AD results from reports of failed fan blades. We are issuing this AD to prevent high-cycle fatigue cracking at the blade root, which could result in uncontained failures of first stage fan blades and damage to the airplane.

Which aircraft AD 2010-21-17 applies to

MakesPratt & Whitney

ModelsJT8D-9, JT8D-9A, JT8D-11, JT8D-15, JT8D-17, JT8D-17R, JT8D

Whether AD 2010-21-17 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 2010-21-17 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.