Is AD 48-29-01 a recurring Airworthiness Directive?

No — AD 48-29-01 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 48-29-01 apply to?

AD 48-29-01 applies to Ryan, Sierra Hotel Aero — models L-17A, Navion. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 48-29-01

one-time

AD 48-29-01 · 1948-01-01 · airframe

Airworthiness Directives; any air intake line, in ground or flight operation. (Ryan Navion Service Letter No. 47 covers this same subject.) FOOTER: Sierra H

Which aircraft AD 48-29-01 applies to

MakesRyanSierra Hotel Aero

ModelsL-17A, Navion

Concerns a substance/device that must not contact the airplane or enter any air intake line during ground or flight operation (subject also covered by Ryan Navion Service Letter No. 47).

Whether AD 48-29-01 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 48-29-01 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.