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Airworthiness Directive 85-21-03

one-time
AD 85-21-03 · 1985-01-01 · airframe

Airworthiness Directives; McDONNELL DOUGLAS DC-8-71, -72, and -73 Series Airplanes

Which aircraft AD 85-21-03 applies to

MakesMcdonnell Douglas
ModelsDC-8-71, DC-8-72, DC-8-73, DC-8

Certificated in any category; requires modification of at least one engine on each side of the airplane to maintain fire containment.

Whether AD 85-21-03 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 85-21-03 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.

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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.