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Airworthiness Directive 99-29824

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AD 99-29824 · 1999-11-18 · turbine engine

Airworthiness Directives; Pratt & Whitney JT9D-7R4 Series Turbofan Engines; Correction

What this AD requires

This document makes a correction to Airworthiness Directive (AD) 99-20-04 applicable to certain Pratt & Whitney (PW) JT9D series turbofan engines that was published in the Federal Register on September 24, 1999 (64 FR 51683). The final rule inadvertently references HPC disk fracture instead of HPT disk fracture and one service bulletin (SB) reference in the compliance section is incorrect. This document corrects those references. The Compliance section in the final rule was inadvertently changed to incorporate the compliance requirements used in a similar PW2000 Airworthiness Directive. The Compliance requirements were correctly published in the NPRM, but were published incorrectly in the Final Rule. This correction will reinstate the compliance requirements originally published in the NPRM, and as intended for the JT9D. In all other respects, the original document remains the same.

Which aircraft AD 99-29824 applies to

MakesPratt & Whitney Jt9D-7R4

certain

Whether AD 99-29824 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 99-29824 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.