Is AD 2021-19-17 a recurring Airworthiness Directive?

No — AD 2021-19-17 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2021-19-17 apply to?

AD 2021-19-17 applies to Sikorsky Aircraft Corporation — models S-92A, S-92. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-19-17

one-time

Official AD 2021-19-17 · FR doc 2021-22464 · 2021-10-18 · 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 (Sikorsky) Model S-92A helicopters. This AD was prompted by an incident of a side facing utility seat detaching from wall attachment points. This AD requires modifying certain side facing utility seats and observer seats, and prohibits installing those seats unless the modification has been accomplished. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-19-17 applies to

MakesSikorsky Aircraft Corporation

ModelsS-92A, S-92

Part-conditional — MBCS12410AA001, MBCS12200, MBCS7301-2.

Applies only if a Martin-Baker side-facing utility seat P/N MBCS12410AA001 (S/N per Table 2 of SIL 831, dated July 10, 2019) not marked 'SIL831 incorporated', or a Martin-Baker observer seat P/N MBCS12200 or MBCS7301-2 (S/N per Table 2 of SIL 833, dated July 11, 2019) not marked 'SIL833 incorporated', is installed. Seat serial numbers are component serials, not aircraft serials.

Whether AD 2021-19-17 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 2021-19-17 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.