Is AD 2010-21-01 a recurring Airworthiness Directive?

Yes — AD 2010-21-01 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

Which aircraft does AD 2010-21-01 apply to?

AD 2010-21-01 applies to Eurocopter — models AS350B, AS350BA, AS350B1, AS350B2, AS350B3, AS350D, AS355E, AS355F. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2010-21-01

recurring

Official AD 2010-21-01 · FR doc 2010-25273 · 2010-10-14 · airframe

Airworthiness Directives; Eurocopter France (Eurocopter) Model AS350B, BA, B1, B2, B3, D, AS355E, F, F1, F2, and N Helicopters

What this AD requires

We are adopting a new airworthiness directive (AD) for the specified Eurocopter model helicopters. This AD results from a mandatory continuing airworthiness information (MCAI) AD issued by the European Aviation Safety Agency (EASA), which is the Technical Agent for the Member States of the European Community. The MCAI AD states that the AD is issued following a report of a crack discovered in the area of the center cross-member at station X 2325, at the attachment point of the yaw channel ball-type control sheath stop, of a Model AS355N helicopter fitted with the collective-to-yaw control coupling. Investigations revealed that the helicopter did not have the structural doublers, which are combined with the collective-to-yaw control coupling installation. Repetitive loads on the non-modified cross- member may cause it to crack. A crack can reduce the yaw control travel. This AD requires actions that are intended to prevent reduced yaw control and subsequent loss of control of the helicopter.

Repetitive inspection. Re-inspect. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 2010-21-01 applies to

MakesEurocopter

ModelsAS350B, AS350BA, AS350B1, AS350B2, AS350B3, AS350D, AS355E, AS355F, AS355F1, AS355F2, AS355N, AS350, AS355

Whether AD 2010-21-01 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 2010-21-01 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.