Is AD 91-12-08 a recurring Airworthiness Directive?

No — AD 91-12-08 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 91-12-08 apply to?

AD 91-12-08 applies to Collins. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 91-12-08

one-time

AD 91-12-08 · 1991-01-01 · appliance

Airworthiness Directives; decreased terminal area navigation capabilities, and an increase in missed approaches, accomplish the following: (a) Inspect the a

Which aircraft AD 91-12-08 applies to

MakesCollins

Part-conditional — 622-4540-120.

gated by installed Collins DME part number — confirm exact model/serial from the records

Whether AD 91-12-08 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 91-12-08 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 →

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.