Is AD 99-15-02 a recurring Airworthiness Directive?

Yes — AD 99-15-02 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

Which aircraft does AD 99-15-02 apply to?

AD 99-15-02 applies to Pratt & Whitney — models JT9D-3A, JT9D-7, JT9D-7H, JT9D-7A, JT9D-7AH, JT9D-7F, JT9D-7J, JT9D-20. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 99-15-02

recurring

Official AD 99-15-02 · FR doc 99-17555 · 1999-07-16 · turbine engine

Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to certain Pratt & Whitney (PW) JT9D series turbofan engines, that requires initial and repetitive in-shop eddy current and on-wing ultrasonic inspections of the Combustion Chamber Outer Casing (CCOC) forward flange (L-flange) fillet radius for cracking, and replacing cracked L-flanges with serviceable parts. Replacement with an improved L-flange constitutes terminating action to the repetitive inspections. This amendment is prompted by reports of CCOC rupture due to cracking in the L-flange fillet radius. The actions specified by the proposed AD are intended to prevent CCOC rupture due to cracking, which could result in an uncontained engine failure and damage to the aircraft.

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 99-15-02 applies to

MakesPratt & Whitney

ModelsJT9D-3A, JT9D-7, JT9D-7H, JT9D-7A, JT9D-7AH, JT9D-7F, JT9D-7J, JT9D-20, JT9D-20J, JT9D

Part-conditional — 644801, 693294, 709016, 729237, 729238, 729239.

Applies only to engines with Combustion Chamber Outer Casing (CCOC), P/Ns 644801, 693294, 709016, 729237, 729238, and 729239 installed. Installed on but not limited to certain models of Boeing 747 and McDonnell Douglas DC-10 series aircraft.

Whether AD 99-15-02 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 99-15-02 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.