Is AD 2015-04-05 a recurring Airworthiness Directive?

No — AD 2015-04-05 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2015-04-05 apply to?

AD 2015-04-05 applies to Sikorsky Aircraft Corporation — models S-76A, S-76B, S-76C, S-76D, S-76. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2015-04-05

one-time

Official AD 2015-04-05 · FR doc 2015-03703 · 2015-02-25 · airframe

Airworthiness Directives; Sikorsky Aircraft Corporation (Sikorsky) Helicopters

What this AD requires

We are adopting a new airworthiness directive (AD) for certain Sikorsky Model S-76A, B, C, and D helicopters. This AD requires inspecting the tail rotor drive shaft (TDS) flange-to-shaft attachment hardware for correct assembly and correct torque of the fasteners. If there is a discrepancy, this AD requires, before further flight, applying an index mark to the flange and TDS, inspecting the flange and shaft for a crack, fracture, wear, and certain measurements, and replacing any part that does not meet the approved criteria before further flight. This AD is prompted by a partial loss of tail rotor drive resulting in a forced landing. The actions specified by this AD are intended to prevent failure at the flange-to-shaft attachment, loss of a tail rotor drive, and subsequent loss of control of the helicopter.

Which aircraft AD 2015-04-05 applies to

MakesSikorsky Aircraft Corporation

ModelsS-76A, S-76B, S-76C, S-76D, S-76

Serial-conditional — narrows to serials ?–761050.

Part-conditional — 76361-04004, 76361-04604.

Applies to helicopters with serial numbers up to and including 761050, with a tail drive shaft (TDS) installed as follows: P/N 76361-04004 (all dash numbers) with S/N up to and including A127-01092; or P/N 76361-04604 (all dash numbers) with S/N prefix A240 or B240, or S/N C240-00001 through C240-00880.

Whether AD 2015-04-05 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 2015-04-05 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 →Read the full directive (Federal Register)

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.