Is AD 81-17-01 a recurring Airworthiness Directive?

No — AD 81-17-01 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 81-17-01 apply to?

AD 81-17-01 applies to Brantly, Enstrom — models B-2, B-2A, B-2B, F28, F28A, F28F, 280, 280F. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 81-17-01

one-time

AD 81-17-01 · 1981-01-01 · appliance

Airworthiness Directives; series helicopters Brantley (Hynes) Model B2 series helicopters Enstrom Model F28, F28A, F28F; 280, 280F helicopters, Model F28C a

Which aircraft AD 81-17-01 applies to

MakesBrantly Enstrom

ModelsB-2, B-2A, B-2B, F28, F28A, F28F, 280, 280F, F28C, 280C

Concerns vibrator assemblies (stall warning) on Brantly B-2 series and Enstrom F28/280 series helicopters equipped with Avco Lycoming HIO-360 engine; source text truncated in available record.

Whether AD 81-17-01 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 81-17-01 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.

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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.