Is AD 99-10-11 a recurring Airworthiness Directive?

No — AD 99-10-11 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 99-10-11 apply to?

AD 99-10-11 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 99-10-11

one-time

Official AD 99-10-11 · FR doc 99-11635 · 1999-05-13 · turbine engine

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

What this AD requires

This amendment supersedes an existing airworthiness directive (AD), applicable to Pratt & Whitney JT8D-200 series turbofan engines, that currently requires periodic inspection of fan blades for locked rotors and foreign object damage (FOD), unlocking of shrouds if necessary, lubrication of fan blade shrouds, and dimensional restoration of the fan blade leading edge. In addition, that AD requires installation of improved design fan blades as terminating action for the inspections. This AD will reduce the lubrication interval, and require removal of rotors that experience repeat lockups within 225 cycles in service. This supersedure is prompted by reports of twenty-five fan blade failures to date. The actions specified by the AD are intended to prevent fan blade failure, which can result in damage to the aircraft.

Which aircraft AD 99-10-11 applies to

MakesPratt & Whitney

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

Part-conditional — 798821, 798821-001, 808121, 808121-001, 809221, 811821, 851121, 851121-001.

Applies to engines that have not incorporated PW Service Bulletin (SB) No. 6193, dated October 31, 1994, or that have the listed fan blade part numbers installed. Installed on but not limited to McDonnell Douglas MD-80 series aircraft.

Whether AD 99-10-11 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 99-10-11 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.