Is AD 2021-12-10 a recurring Airworthiness Directive?

No — AD 2021-12-10 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2021-12-10 apply to?

AD 2021-12-10 applies to Leonardo S.P.A. — models AB139, AW139. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-12-10

one-time

Official AD 2021-12-10 · FR doc 2021-11961 · 2021-06-07 · airframe

Airworthiness Directives; Leonardo S.p.a.

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for Leonardo S.p.a. Model AB139 and AW139 helicopters with 3-stretcher kit part number 139084-501 installed. This AD was prompted by a report of a design deficiency which affects the primary stretcher unit of the 3- stretcher kit. This AD requires installing a placard on the primary stretcher. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-12-10 applies to

MakesLeonardo S.P.A.

ModelsAB139, AW139

Part-conditional — 139084-501.

Applies to helicopters with 3-stretcher kit part number 139084-501 installed.

Whether AD 2021-12-10 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 2021-12-10 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.