Is AD 99-7691 a recurring Airworthiness Directive?

No — AD 99-7691 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 99-7691 apply to?

AD 99-7691 applies to Mcdonnell Douglas — models MD-88. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 99-7691

one-time

AD 99-7691 · 1999-04-01 · airframe

Airworthiness Directives; McDonnell Douglas Model DC-9-80 Series Airplanes, and Model MD-88 Airplanes

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas Model DC-9-80 series airplanes, and Model MD-88 airplanes, that requires a one-time inspection to detect corrosion of the lug bores and the surface of the hinge plates of the vertical-to-horizontal stabilizer; and corrective actions, if necessary. This amendment is prompted by reports of corrosion of the lug bores and the surface of the hinge plates of the vertical-to- horizontal stabilizer, apparently due to the improper brushing of cadmium on the hinge plates during manufacture. The actions specified by this AD are intended to detect and correct corrosion of the lug bores and the surface of the hinge plates of the vertical-to-horizontal stabilizer, which could result in reduced structural integrity of the airplane.

Which aircraft AD 99-7691 applies to

MakesMcdonnell Douglas

ModelsMD-88

certain

Whether AD 99-7691 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 99-7691 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.