Is AD 99-12829 a recurring Airworthiness Directive?

Yes — AD 99-12829 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

Which aircraft does AD 99-12829 apply to?

AD 99-12829 applies to Mcdonnell Douglas — models C-9. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 99-12829

recurring

AD 99-12829 · 1999-06-03 · airframe

Airworthiness Directives; McDonnell Douglas Model DC-9 and C-9 (Military) Series Airplanes

What this AD requires

This amendment corrects information in an existing airworthiness directive (AD), applicable to certain McDonnell Douglas Model DC-9 and C-9 (military) series airplanes, that currently requires repetitive inspections to detect fatigue cracking of the fuselage frames and longerons 16R and 17R above the forward lower cargo door; repair, if necessary; and modification of the fuselage frames and longerons, if necessary, and follow-on repetitive inspections to detect fatigue cracking of the skin adjacent to the modification. That AD was prompted by numerous instances of fatigue cracking of the fuselage frames and longerons. The actions specified by that AD are intended to prevent fatigue cracking of the fuselage frames and longerons 16R and 17R, which could result in reduced structural integrity of the airplane. This amendment corrects an erroneous reference to a certain volume of the Supplemental Inspection Document.

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 99-12829 applies to

MakesMcdonnell Douglas

ModelsC-9

certain

Whether AD 99-12829 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 99-12829 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.