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Airworthiness Directive 47-21-05

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AD 47-21-05 · 1947-01-01 · airframe

Airworthiness Directives; Navion Serial Numbers NAV-4-11 Through 21 and 44 Through 47

Which aircraft AD 47-21-05 applies to

MakesNavion
Applies to all models of the make above.
Serial-conditional — narrows to serials NAV-4-11–NAV-4-21, NAV-4-44–NAV-4-47.

Replacement of a component required; compliance required not later than August 1, 1947 (specific part text truncated in source).

Whether AD 47-21-05 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 47-21-05 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.