Is AD 86-19-12 a recurring Airworthiness Directive?

No — AD 86-19-12 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 86-19-12

Q: Which aircraft does AD 86-19-12 apply to?

AD 86-19-12 applies to Allison, Hughes Helicopters, Sikorsky Aircraft — models 250-C30, 250-C30S, 369F, 369FF, S-76A, 250. Serial/part conditions may narrow it to specific aircraft.

one-time

AD 86-19-12 · 1986-01-01 · turboshaft engine

Airworthiness Directives; Helicopter Company (Hughes) Models 369F and 369FF aircraft. SIKORSKY AIRCRAFT: Applies to Sikorsky Aircraft Model S-76A helicopter

Which aircraft AD 86-19-12 applies to

MakesAllisonHughes HelicoptersSikorsky Aircraft

Models250-C30, 250-C30S, 369F, 369FF, S-76A, 250

Applies to Allison Model 250-C30 and 250-C30S engines installed in Hughes Helicopters Models 369F and 369FF, and in Sikorsky Aircraft Model S-76A helicopters certificated in any category, to prevent failure/secondary damage. Within 30 days after December 18, 1984 for aircraft in compliance with telegraphic AD T84-16-51, prior to further flight for aircraft not in compliance.

Whether AD 86-19-12 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 86-19-12 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.