Is AD 78-16-08 a recurring Airworthiness Directive?

No — AD 78-16-08 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 78-16-08 apply to?

AD 78-16-08 applies to Piper — models PA-32R-300, PA-32RT-300, PA-32. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 78-16-08

one-time

AD 78-16-08 · 1978-01-01 · airframe

Airworthiness Directives; the area of the oil hose assembly end fittings and in the area of the fluted portion at the oil cooler end tanks for cracks and oi

Which aircraft AD 78-16-08 applies to

MakesPiper

ModelsPA-32R-300, PA-32RT-300, PA-32

Oil hose assembly end fittings and oil cooler end tanks inspected for cracks/leakage; leaking or cracked oil coolers replaced.

Whether AD 78-16-08 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 78-16-08 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.

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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.