AD 2010-21-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Eurocopter France (ECF) Model AS350B3 and EC130 B4 Helicopters |
Unsafe Condition
A dormant failure of one of the two contactors 53Ka or 53Kb can occur following the introduction of MOD 073254 for the Model AS350B3 or MOD 073773 for the Model EC130 B4. 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.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect for the proper operation of contactors 53Ka and 53Kb by rotating the pilot and co-pilot throttle twist grip controls between the 'IDLE' and 'FLIGHT' position in accordance with the Accomplishment Instructions of the applicable Eurocopter Alert Service Bulletin. Test the pilot and co-pilot throttle twist grip controls for proper functioning. If the controls are not functioning properly, repair them.
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Compliance Time
Before the next practice autorotation or on or before 100 hours time-in-service (TIS), whichever occurs first, unless accomplished previously, and thereafter at intervals not to exceed 600 hours TIS.
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Affected Aircraft
Eurocopter France Model AS350B3 and EC130 B4 helicopters, certificated in any category, with the ARRIEL 2B1 engine with the two-channel Full Authority Digital Engine Control (FADEC), and with new twist grip modification (MOD) 073254 for the Model AS350B3 or MOD 073773 for the Model EC130 B4 installed.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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