Is AD 2021-18-07 a recurring Airworthiness Directive?

No — AD 2021-18-07 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2021-18-07 apply to?

AD 2021-18-07 applies to Leonardo S.P.A. — models AB412, AB412 EP. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-18-07

one-time

Official AD 2021-18-07 · FR doc 2021-19032 · 2021-09-03 · airframe

Airworthiness Directives; Leonardo S.p.a. Helicopters

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain Leonardo S.p.a. Model AB412 and AB412 EP helicopters. This AD was prompted by the results of a fatigue review. This AD requires establishing a life limit for certain part-numbered high landing gear aft crosstubes. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-18-07 applies to

MakesLeonardo S.P.A.

ModelsAB412, AB412 EP

Part-conditional — 412-050-012-(XXX), 412-050-014-(XXX), 412-050-050-(XXX), 412-050-059-(XXX).

Applies only to helicopters with a high skid landing gear assembly having one of the listed part numbers (where (XXX) represents any 3-digit combination) installed.

Whether AD 2021-18-07 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 2021-18-07 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.