Is AD 2020-15-17 a recurring Airworthiness Directive?

No — AD 2020-15-17 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2020-15-17 apply to?

AD 2020-15-17 applies to Sikorsky — models S-76C, S-76. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2020-15-17

one-time

Official AD 2020-15-17 · FR doc 2020-16405 · 2020-08-05 · airframe

Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain Sikorsky Aircraft Corporation Model S-76C helicopters. This AD was prompted by reports of inaccurate main gear box (MGB) indications in flight. This AD requires updating the remote data acquisition unit (RDAU) software and re-identifying the RDAU and, for certain helicopters, updating the software of the display unit (DU) and re- identifying the DU. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2020-15-17 applies to

MakesSikorsky

ModelsS-76C, S-76

Part-conditional — 76450-01098-106, 76450-01098-107, 76450-01098-109.

Applies only to helicopters equipped with remote data acquisition unit (RDAU) P/N 76450-01098-106, -107, or -109.

Whether AD 2020-15-17 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 2020-15-17 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.