Is AD 49-12-02 a recurring Airworthiness Directive?

No — AD 49-12-02 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 49-12-02 apply to?

AD 49-12-02 applies to Ryan — models Navion (Army L-17A), Navion A (Army L-17B and L-17C), Navion. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 49-12-02

one-time

AD 49-12-02 · 1949-01-01 · airframe

Airworthiness Directives; drilled vent plugs be replaced by undrilled plugs. The Ryan factory has accomplished this change in production, starting with airp

Which aircraft AD 49-12-02 applies to

MakesRyan

ModelsNavion (Army L-17A), Navion A (Army L-17B and L-17C), Navion

All drilled fuel-tank vent plugs must be replaced by undrilled plugs; the vent line runs directly above the fuel pump and into the engine compartment. The Ryan factory accomplished this change in production starting with airplane Serial Number 1823, painting undrilled vent plugs with zinc chromate primer.

Whether AD 49-12-02 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 49-12-02 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.