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Airworthiness Directive 47-21-07

one-time
AD 47-21-07 · 1947-01-01 · airframe

Airworthiness Directives; Navion Serial Numbers NAV-4-10 Through 20, 22 Through 26, 28, 29, 31 Through 49, 51, 52, 55 Through 58, 60, 63, 73, 76, 79, 82 Thr

Which aircraft AD 47-21-07 applies to

MakesNavion
Applies to all models of the make above.
Serial-conditional — narrows to serials NAV-4-10–NAV-4-20, NAV-4-22–NAV-4-26, NAV-4-28–NAV-4-28, NAV-4-29–NAV-4-29, NAV-4-31–NAV-4-49, NAV-4-51–NAV-4-51, NAV-4-52–NAV-4-52, NAV-4-55–NAV-4-58, NAV-4-60–NAV-4-60, NAV-4-63–NAV-4-63, NAV-4-73–NAV-4-73, NAV-4-76–NAV-4-76, NAV-4-79–NAV-4-79, NAV-4-82–NAV-4-84, NAV-4-88–NAV-4-95, NAV-4-99–?.

Install a dural strip (approx. 5/8-inch x 0.093-inch thickness) flush-riveted to the scoop (per NAA Field Service Bulletin No. 15).

Whether AD 47-21-07 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 47-21-07 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.