Is AD 2009-04-02 a recurring Airworthiness Directive?

No — AD 2009-04-02 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2009-04-02 apply to?

AD 2009-04-02 applies to Pratt & Whitney — models PW4090, PW4090-3. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2009-04-02

one-time

Official AD 2009-04-02 · FR doc E9-3041 · 2009-02-17 · turbine engine

Airworthiness Directives; Pratt & Whitney PW4090 and PW4090-3 Turbofan Engines

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for Pratt & Whitney (PW) PW4090 and PW4090-3 turbofan engines with front turbine hub, part number (P/N) 53L601, installed. This AD reduces the published life limit of those front turbine hubs, from 12,000 cycles- since-new (CSN) to 9,370 CSN. This AD also removes from service those front turbine hubs using a drawdown schedule. This AD results from PW updating the low-cycle-fatigue (LCF) life analysis for front turbine hubs, P/N 53L601. We are issuing this AD to prevent an uncontained failure of the front turbine hub, resulting in an in-flight engine shutdown and possible damage to the airplane.

Which aircraft AD 2009-04-02 applies to

MakesPratt & Whitney

ModelsPW4090, PW4090-3

Part-conditional — 53L601, 53L121.

Applies only to engines with front turbine hub P/N 53L601 (part of assembly P/N 53L121) installed.

Whether AD 2009-04-02 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 2009-04-02 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.