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Airworthiness Directive 2001-20-13

recurring
Official AD 2001-20-13 · FR doc 01-25396 · 2001-10-12 · turbine engine

Airworthiness Directives; Pratt & Whitney PW4000 Series Turbofan Engines

What this AD requires

This amendment adopts a new airworthiness directive (AD), that is applicable to certain models of Pratt & Whitney PW4000 series turbofan engines. This amendment requires operators to perform initial and repetitive inspections for cracking of high pressure compressor (HPC) front drum rotors based on cycle usage. This amendment also requires the removal from service of any cracked HPC front drum rotors. This amendment is prompted by reports that 11 HPC drum rotors have been found cracked on the spacer surface between the sixth and seventh stage disks. The actions specified by this AD are intended to detect premature cracking of the HPC drum rotor that could result in an uncontained engine failure and damage to the airplane.

Repetitive inspection. Re-inspect. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 2001-20-13 applies to

MakesPratt & Whitney
ModelsPW4000

Applies to Pratt & Whitney PW4000-series engines; requires initial and repetitive borescope/eddy-current inspections of the HPC front drum rotor per PW Alert SB PW4ENG A72-722 (dated Sept 29, 2000, or Rev 1 dated June 7, 2001) to detect premature cracking that could cause uncontained engine failure.

Whether AD 2001-20-13 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 2001-20-13 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.