Is AD 47-21-09 a recurring Airworthiness Directive?

No — AD 47-21-09 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 47-21-09 apply to?

AD 47-21-09 applies to Navion. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 47-21-09

one-time

AD 47-21-09 · 1947-01-01 · airframe

Airworthiness Directives; Navion All Serials Up to and Including Number NAV-4-947

Which aircraft AD 47-21-09 applies to

MakesNavion

Applies to all models of the make above.

Serial-conditional — narrows to serials ?–NAV-4-947.

Inspect actuating cylinders for evidence of cracks or other damage; replace any cylinders found damaged; compliance required prior to September 1, 1947.

Whether AD 47-21-09 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 47-21-09 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.