Is AD 99-15-08 a recurring Airworthiness Directive?

Yes — AD 99-15-08 requires a repetitive inspection every 650 hours. Next-due depends on the aircraft's time in service.

Which aircraft does AD 99-15-08 apply to?

AD 99-15-08 applies to Boeing — models 747. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 99-15-08

recurring

Official AD 99-15-08 · FR doc 99-18198 · 1999-07-21 · airframe

Airworthiness Directives; Boeing Model 747-200 and -300 Series Airplanes Equipped With General Electric CF6-80C2 Series Engines

What this AD requires

This amendment supersedes an existing airworthiness directive (AD), applicable to certain Boeing Model 747-200 and -300 series airplanes, that currently requires various inspections and functional tests to detect discrepancies of the thrust reverser control and indication system, and correction of any discrepancy found. This amendment reduces the repetitive interval for one certain functional test. This amendment is prompted by reports indicating that several center drive units (CDU) were returned to the manufacturer of the CDU's because of low holding torque of the CDU cone brake. The actions specified by this AD are intended to ensure the integrity of the fail safe features of the thrust reverser system by preventing possible failure modes in the thrust reverser control system that can result in inadvertent deployment of a thrust reverser during flight.

Repetitive inspection. Re-inspect every 650 hours. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 99-15-08 applies to

MakesBoeing

Models747

Concerns the thrust reverser control/indication system (position switch module, center drive unit cone brake, bullnose seal on the translating sleeve) per Boeing Alert Service Bulletin 747-78A2130, dated May 26, 1994, and Boeing Service Bulletin 747-78A2166, Revision 1, dated October 9, 1997; restates and adds to the requirements of AD 95-06-01.

Whether AD 99-15-08 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 99-15-08 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.