Is AD 47-21-04 a recurring Airworthiness Directive?

No — AD 47-21-04 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 47-21-04 apply to?

AD 47-21-04 applies to Navion. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 47-21-04

one-time

AD 47-21-04 · 1947-01-01 · airframe

Airworthiness Directives; Navion Serial Numbers NAV-4-2 Through 21, 24 Through 29, 32, 35, 36, 40, 42 Through 47, 57, 192, 199, 251

Which aircraft AD 47-21-04 applies to

MakesNavion

Applies to all models of the make above.

Serial-conditional — narrows to serials NAV-4-2–NAV-4-21, NAV-4-24–NAV-4-29, NAV-4-32–NAV-4-32, NAV-4-35–NAV-4-35, NAV-4-36–NAV-4-36, NAV-4-40–NAV-4-40, NAV-4-42–NAV-4-47, NAV-4-57–NAV-4-57, NAV-4-192–NAV-4-192, NAV-4-199–NAV-4-199, NAV-4-251–NAV-4-251.

Part-conditional — 145-89010.

Install parts per NAA Drawing 145-89010 (per NAA Field Service Bulletin No. 2).

Whether AD 47-21-04 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 47-21-04 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.