Is AD 87-24-11 a recurring Airworthiness Directive?

No — AD 87-24-11 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 87-24-11 apply to?

AD 87-24-11 applies to Garrett — models GTCP 85. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 87-24-11

one-time

AD 87-24-11 · 1987-01-01 · turbine engine

Airworthiness Directives; GARRETT TURBINE ENGINE COMPANY: Applies to Garrett Model GTCP 85 series Auxiliary Power Units Equipped with One-Piece Cast Turbine

Which aircraft AD 87-24-11 applies to

MakesGarrett

ModelsGTCP 85

Part-conditional — 968095-X, 3604604-X, 3606982-1, 3842072-1.

Applies to Garrett Model GTCP 85 series Auxiliary Power Units equipped with one-piece cast turbine wheels. Amendment 39-5781. To prevent turbine wheel separation and resulting containment shroud breach.

Whether AD 87-24-11 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 87-24-11 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.