Is AD 2012-04-04 a recurring Airworthiness Directive?

No — AD 2012-04-04 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2012-04-04

Q: Which aircraft does AD 2012-04-04 apply to?

AD 2012-04-04 applies to Pratt & Whitney Division — models PW4050, PW4052, PW4056, PW4060, PW4060A, PW4060C, PW4062, PW4062A. Serial/part conditions may narrow it to specific aircraft.

one-time

Official AD 2012-04-04 · FR doc 2012-4745 · 2012-03-01 · turbine engine

Airworthiness Directives; Pratt & Whitney Division Turbofan Engines

What this AD requires

We are adopting a new airworthiness directive (AD) for all Pratt & Whitney PW4050, PW4052, PW4056, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4152, PW4156, PW4156A, PW4158, PW4160, PW4460, PW4462, and PW4650 turbofan engines, including models with any dash number suffix. This AD was prompted by an engine overspeed event that occurred during taxi and resulted in a high-pressure compressor surge and tailpipe fire. This AD requires replacing Pratt & Whitney fuel metering units (FMUs), part numbers (P/Ns) 53T335 (HS 801000-1), 55T423 (HS 801000-2), and 50U150 (HS 801000-3) at the next shop visit after the effective date of this AD. We are issuing this AD to prevent engine overspeed on these engines, which could result in an uncontained engine failure and damage to the airplane.

Which aircraft AD 2012-04-04 applies to

MakesPratt & Whitney Division

ModelsPW4050, PW4052, PW4056, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4152, PW4156, PW4156A, PW4158, PW4160, PW4460, PW4462, PW4650, PW4000

Part-conditional — 53T335, 55T423, 50U150.

Applies to engines, including models with any dash number suffix, with a Pratt & Whitney fuel metering unit (FMU) installed: P/N 53T335 (also marked HS 801000-1), 55T423 (HS 801000-2), or 50U150 (HS 801000-3).

Whether AD 2012-04-04 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 2012-04-04 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.