Is AD 2012-18-03 a recurring Airworthiness Directive?

No — AD 2012-18-03 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2012-18-03

Q: Which aircraft does AD 2012-18-03 apply to?

AD 2012-18-03 applies to Pratt & Whitney Division — models PW4050, PW4052, PW4056, PW4152, PW4156, PW4650, PW4060, PW4060A. Serial/part conditions may narrow it to specific aircraft.

one-time

Official AD 2012-18-03 · FR doc 2012-21821 · 2012-09-06 · turbine engine

Airworthiness Directives; Pratt & Whitney Division Turbofan Engines

What this AD requires

We are adopting a new airworthiness directive (AD) for certain Pratt & Whitney Division PW4000-94" and PW4000-100" turbofan engines having a 1st stage high-pressure turbine (HPT) seal support, part number (P/N) 55K601 (contained within assembly P/N 55K602-01) or P/N 50K532 (contained within assembly P/N 50K530-01), installed. This AD was prompted by 58 reports of cracked 1st stage HPT air seal rings, including 15 in-flight engine shutdowns. This AD requires removal and replacement of the 1st stage HPT seal support and inspection of the 1st stage HPT air seal ring. We are issuing this AD to prevent failure of the 1st stage HPT air seal ring, which could lead to an internal oil fire, uncontained engine failure, and damage to the airplane.

Which aircraft AD 2012-18-03 applies to

MakesPratt & Whitney Division

ModelsPW4050, PW4052, PW4056, PW4152, PW4156, PW4650, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4156A, PW4158, PW4160, PW4460, PW4462, PW4164, PW4164C, PW4164C/B, PW4168, PW4168A, PW4000

Part-conditional — 55K601, 55K602-01, 50K532, 50K530-01.

Applies only when a 1st stage high-pressure turbine (HPT) seal support, P/N 55K601 (contained within assembly P/N 55K602-01) or P/N 50K532 (contained within assembly P/N 50K530-01), is installed.

Whether AD 2012-18-03 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 2012-18-03 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.