Is AD 2010-21-07 a recurring Airworthiness Directive?

No — AD 2010-21-07 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2010-21-07 apply to?

AD 2010-21-07 applies to Eurocopter France — models AS350B3, EC130 B4, AS350, EC130. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2010-21-07

one-time

Official AD 2010-21-07 · FR doc 2010-25270 · 2010-10-14 · airframe

Airworthiness Directives; Eurocopter France (ECF) Model AS350B3 and EC130 B4 Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD) for the Eurocopter France Model AS350B3 and EC130 B4 helicopters. This amendment is prompted by 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 a dormant failure of one of the two contactors 53Ka or 53Kb can occur following certain modifications. Failure of a contactor can prevent switching from "IDLE" mode to "FLIGHT" mode during autorotation training making it impossible to execute a power recovery and compelling the pilot to continue the autorotation to the ground. This condition, if not corrected, can lead to an unintended touchdown to the ground during a practice autorotation at a flight-idle power setting, damage to the helicopter, and injury to the occupants.

Which aircraft AD 2010-21-07 applies to

MakesEurocopter France

ModelsAS350B3, EC130 B4, AS350, EC130

Applies only to helicopters certificated in any category with the ARRIEL 2B1 engine and two-channel Full Authority Digital Engine Control (FADEC) installed, and with new twist grip modification (MOD) 073254 installed on the AS350B3, or MOD 073773 installed on the EC130 B4. Addresses a dormant failure of contactor 53Ka/53Kb that can prevent switching from IDLE to FLIGHT mode during autorotation training.

Whether AD 2010-21-07 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 2010-21-07 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.