Is AD 2021-20-01 a recurring Airworthiness Directive?

No — AD 2021-20-01 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2021-20-01

Q: Which aircraft does AD 2021-20-01 apply to?

AD 2021-20-01 applies to Pratt & Whitney — models PW1519G, PW1521G, PW1521G-3, PW1521GA, PW1524G, PW1524G-3, PW1525G, PW1525G-3. Serial/part conditions may narrow it to specific aircraft.

one-time

Official AD 2021-20-01 · FR doc 2021-20365 · 2021-09-22 · turbine engine

Airworthiness Directives; Pratt & Whitney Turbofan Engines

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for all Pratt & Whitney PW1500G and PW1900G series turbofan engines with a certain high-pressure turbine (HPT) 1st-stage hub or HPT rotor 1st- stage blade retaining plate installed. This AD was prompted by a report from the manufacturer who determined that the HPT 1st-stage hub and HPT rotor 1st-stage blade retaining plate fail to meet the published life- cycle limits for each part. This AD requires removal and replacement of the HPT 1st-stage hub and HPT rotor 1st-stage blade retaining plate prior to reaching certain cycle limits. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-20-01 applies to

MakesPratt & Whitney

ModelsPW1519G, PW1521G, PW1521G-3, PW1521GA, PW1524G, PW1524G-3, PW1525G, PW1525G-3, PW1919G, PW1921G, PW1922G, PW1923G, PW1923G-A, PW1500G, PW1900G

Part-conditional — 30G5701, 30G1692.

Applies only to engines with a high-pressure turbine (HPT) 1st-stage hub, P/N 30G5701, or an HPT rotor 1st-stage blade retaining plate, P/N 30G1692, installed.

Whether AD 2021-20-01 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 2021-20-01 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.