Is AD 2011-25-09 a recurring Airworthiness Directive?

No — AD 2011-25-09 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2011-25-09

Q: Which aircraft does AD 2011-25-09 apply to?

AD 2011-25-09 applies to Pratt & Whitney Division — models PW4164, PW4164C, PW4164C/B, PW4168, PW4168A, PW4060, PW4060A, PW4060C. Serial/part conditions may narrow it to specific aircraft.

one-time

Official AD 2011-25-09 · FR doc 2011-31177 · 2011-12-06 · turbine engine

Airworthiness Directives; Pratt & Whitney Division (PW) PW4000 Series Turbofan Engines

What this AD requires

We are adopting a new airworthiness directive (AD) for certain PW4000 turbofan engines. This AD was prompted by an updated low-cycle fatigue (LCF) life analysis performed by PW. This AD requires removing certain part number (P/N) high-pressure turbine (HPT) stage 1 and HPT stage 2 airseals and HPT stage 1 airseal rings before their published life limit and establishes a new lower life limit for these parts. We are issuing this AD to prevent failure of these parts, which could lead to an uncontained engine failure and damage to the airplane.

Which aircraft AD 2011-25-09 applies to

MakesPratt & Whitney Division

ModelsPW4164, PW4164C, PW4164C/B, PW4168, PW4168A, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4156A, PW4158, PW4160, PW4460, PW4462, PW4050, PW4052, PW4056, PW4152, PW4156, PW4650, PW4000

Part-conditional — 50L879, 53L030, 50L664.

Applies only when HPT stage 1 airseal P/N 50L879, HPT stage 2 airseal P/N 53L030, or HPT stage 1 airseal ring P/N 50L664 is installed. For PW4000-94" models (PW4060/4062/4156A/4158/4160/4460/4462/4050/4052/4056/4152/4156/4650), applicability additionally requires incorporation of Engineering Change Numbers EC92KK322G/H/I/J/K or one of PW SBs PW4ENG 72-490, 72-504, 72-512, 72-572, 72-588, or 73-150, indicated by a (-3), (-3A), or (-3B) suffix on the engine data plate.

Whether AD 2011-25-09 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 2011-25-09 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.