Is AD 81-24-06 a recurring Airworthiness Directive?

No — AD 81-24-06 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 81-24-06

Q: Which aircraft does AD 81-24-06 apply to?

AD 81-24-06 applies to Continental, Teledyne Continental, Teledyne-Continental, Tcm — models IO-520, TSIO-520, GTSIO-520. Serial/part conditions may narrow it to specific aircraft.

one-time

AD 81-24-06 · 1981-01-01 · reciprocating engine

Airworthiness Directives; HEADING: TELEDYNE CONTINENTAL MOTORS Models IO-520, TSIO-520 and GTSIO-520 (except GTSIO-520-F and K) Engines ACTION: SUMMARY: DAT

Which aircraft AD 81-24-06 applies to

MakesContinentalTeledyne ContinentalTeledyne-ContinentalTcm

ModelsIO-520, TSIO-520, GTSIO-520

Continental IO-520 / TSIO-520 / GTSIO-520 (except GTSIO-520-F and -K) — applicability read from the AD title (pre-1994 directive, no full text on file) — confirm the exact engine model, serial, and compliance status from the records

Whether AD 81-24-06 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 81-24-06 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.