Is AD 2021-05-01 a recurring Airworthiness Directive?

No — AD 2021-05-01 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2021-05-01 apply to?

AD 2021-05-01 applies to Airbus Helicopters — models SA330J, SA330. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-05-01

one-time

Official AD 2021-05-01 · FR doc 2021-05143 · 2021-03-12 · airframe

Airworthiness Directives; Airbus Helicopters

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Model SA330J helicopters. This AD was prompted by report of failure of a second stage planet gear of the main gear box (MGB). This AD requires replacement of the MGB particle detector assembly with an improved, elongated MGB particle detector assembly, as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-05-01 applies to

MakesAirbus Helicopters

ModelsSA330J, SA330

Whether AD 2021-05-01 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 2021-05-01 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.