Is AD 81-08-04 a recurring Airworthiness Directive?

No — AD 81-08-04 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 81-08-04 apply to?

AD 81-08-04 applies to Puritan-Bennett Aero Systems Company. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 81-08-04

one-time

AD 81-08-04 · 1981-01-01 · appliance

Airworthiness Directives; PURITAN-BENNETT AERO SYSTEMS COMPANY Oxygen Masks P/N 174039, 174010-01, 174010-03, and ZMR100 Series

Which aircraft AD 81-08-04 applies to

MakesPuritan-Bennett Aero Systems Company

Serial-conditional — narrows to serials 0001–0012.

Part-conditional — 174039, 174010-01, 174010-03, ZMR100.

Gated to specific oxygen mask part numbers and serial-number ranges (masks without serial numbers are unaffected); the serial range shown covers P/N 174039 only — confirm the full per-part-number serial listing (P/N 174010-01/-03, ZMR100) from the complete AD text before use.

Whether AD 81-08-04 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 81-08-04 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.