Is AD 78-10-04 a recurring Airworthiness Directive?

No — AD 78-10-04 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 78-10-04 apply to?

AD 78-10-04 applies to Airesearch. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 78-10-04

one-time

AD 78-10-04 · 1978-01-01 · turbine engine

Airworthiness Directives; ) Operators who have not kept a record of APU operating hours of service shall estimate hours of APU operation equating APU operat

Which aircraft AD 78-10-04 applies to

MakesAiresearch

Concerns APU (auxiliary power unit) operating-hours recordkeeping; operators without APU hour records must estimate hours using a ratio approved by the FAA maintenance inspector; APU identified only as AiResearch in excerpt; specific model not stated.

Whether AD 78-10-04 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 78-10-04 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.