Is AD 85-16-01 a recurring Airworthiness Directive?

No — AD 85-16-01 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 85-16-01 apply to?

AD 85-16-01 applies to Hamilton Standard. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 85-16-01

one-time

AD 85-16-01 · 1985-01-01 · appliance

Airworthiness Directives; the PRSOV, whichever occurs later, on airplanes equipped with Pratt & Whitney JT9D series engines: A. Replace the PRSOV, Hamilton

Which aircraft AD 85-16-01 applies to

MakesHamilton Standard

Part-conditional — 773288.

Gated to airplanes equipped with Pratt & Whitney JT9D series engines and to the specific Hamilton Standard PRSOV part number noted in the teaser — confirm engine fit and exact configuration from the full AD text before use.

Whether AD 85-16-01 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 85-16-01 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.