Is AD 2021-03-06 a recurring Airworthiness Directive?

No — AD 2021-03-06 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2021-03-06

Q: Which aircraft does AD 2021-03-06 apply to?

AD 2021-03-06 applies to Airbus Helicopters — models SA-365N, SA-365N1, AS-365N2, AS 365 N3, EC 155B, EC155B1, SA-365, AS-365. Serial/part conditions may narrow it to specific aircraft.

one-time

Official AD 2021-03-06 · FR doc 2021-03664 · 2021-02-25 · airframe

Airworthiness Directives; Airbus Helicopters

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain Airbus Helicopters Model SA-365N, SA-365N1, AS-365N2, AS 365 N3, EC 155B, and EC155B1 helicopters. This AD was prompted by the FAA's determination that to improve the process and performance in collecting metal particles in the main gear box (MGB) certain existing magnetic plugs (electrical and nonelectrical) installed in the MGB pump intake must be replaced with improved non-electrical magnetic plugs. This AD requires replacing the existing magnetic plug with an improved non- electrical magnetic plug, as specified in a European Aviation Safety Agency (now 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 2021-03-06 applies to

MakesAirbus Helicopters

ModelsSA-365N, SA-365N1, AS-365N2, AS 365 N3, EC 155B, EC155B1, SA-365, AS-365, EC155

Part-conditional — 1B7807, 704A34543017, 365A32-1711-00.

Applies to helicopters equipped with magnetic plugs part number 1B7807 or 704A34543017 (electrical), or part number 365A32-1711-00 (non-electrical), installed in the main gearbox (MGB) pump intake.

Whether AD 2021-03-06 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 2021-03-06 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.