Is AD 2001-05-07 a recurring Airworthiness Directive?

No — AD 2001-05-07 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2001-05-07 apply to?

AD 2001-05-07 applies to Pratt & Whitney — models PW4052, PW4056, PW4060, PW4060A, PW4062, PW4152, PW4156, PW4156A. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2001-05-07

one-time

Official AD 2001-05-07 · FR doc 01-6300 · 2001-03-15 · turbine engine

Airworthiness Directives; Pratt & Whitney PW4000 Series Turbofan Engines

What this AD requires

This amendment supersedes airworthiness directive (AD) 2000- 25-06, dated December 5, 2000, that is applicable to certain Pratt & Whitney (PW) PW4000 turbofan engines with the current design low pressure turbine (LPT) 4th stage air seal installed. That AD currently requires, based on engine model, replacement of the current design seal with a new design seal, or with a modified seal. This amendment adds the listing of certain engine serial numbers, to correct an error in the applicability section of AD 2000-25-06, for engines affected by PW Service Bulletin (SB) PW4 ENG 72-657, Revision 1, dated July, 19, 2000. This correction is prompted by comments received on AD 2000-25-06. The actions specified by this AD are intended to reduce stresses that could lead to LPT 4th stage air seal cracking, resulting in seal fracture, uncontained engine failure, and damage to the airplane.

Which aircraft AD 2001-05-07 applies to

MakesPratt & Whitney

ModelsPW4052, PW4056, PW4060, PW4060A, PW4062, PW4152, PW4156, PW4156A, PW4158, PW4164, PW4168, PW4168A, PW4460, PW4462, PW4000

Part-conditional — 50N478, 50N478-001.

Applies only to engines with low pressure turbine (LPT) 4th stage air seal, part number 50N478 or 50N478-001, installed.

Whether AD 2001-05-07 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 2001-05-07 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.