Is AD 93-13-11 a recurring Airworthiness Directive?

No — AD 93-13-11 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 93-13-11 apply to?

AD 93-13-11 applies to Mbb, Piaggio, Airtractor — models BK117, P166-DL3, AT302. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 93-13-11

one-time

AD 93-13-11 · 1993-01-01 · turbine engine

Airworthiness Directives; airplanes. Compliance: Required as indicated, unless accomplished previously. To prevent gas generator turbine rotor disk failure,

Which aircraft AD 93-13-11 applies to

MakesMbb PiaggioAirtractor

ModelsBK117, P166-DL3, AT302

To prevent gas generator turbine rotor disk failure and uncontained engine failure; installed engine is common to MBB BK117 helicopters and Piaggio P166-DL3 / Airtractor AT302 airplanes; engine manufacturer/model not stated in excerpt.

Whether AD 93-13-11 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 93-13-11 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.