Is AD 99-26-06 a recurring Airworthiness Directive?

Yes — AD 99-26-06 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

Which aircraft does AD 99-26-06 apply to?

AD 99-26-06 applies to Pratt & Whitney — models JT8D-209, JT8D-217, JT8D-217A, JT8D-217C, JT8D-219, JT8D. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 99-26-06

recurring

Official AD 99-26-06 · FR doc 99-32506 · 1999-12-21 · turbine engine

Airworthiness Directives; Pratt & Whitney JT8D-200 Series Turbofan Engines

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to Pratt & Whitney JT8D-200 series turbofan engines, that requires initial and repetitive fluorescent magnetic particle inspections or fluorescent penetrant inspections of the combustion chamber outer case (CCOC) for cracks, and, if necessary, replacement with serviceable parts. Also, this AD requires a one-time boss material verification, and, if necessary, replacement with serviceable parts. Finally, this AD requires replacement of CCOCs with welded-on bosses with improved, one-piece CCOCs. Installation of the one-piece CCOC constitutes terminating action to the inspection requirements of this AD. This amendment is prompted by a report of an uncontained engine failure caused by fatigue cracks originating at the weld joining the drain boss to the CCOC. The actions specified by this AD are intended to prevent CCOC cracks, which 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 99-26-06 applies to

MakesPratt & Whitney

ModelsJT8D-209, JT8D-217, JT8D-217A, JT8D-217C, JT8D-219, JT8D

Part-conditional — 5000238-01, 797707, 807684, 815830.

Applies only to engines with a combustion chamber outer case (CCOC) of these part numbers installed.

Whether AD 99-26-06 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 99-26-06 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.