AD Amdt-39-19204
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Helicopters Model AS350B3 | Airworthiness Directives; Airbus Helicopters |
Unsafe Condition
lack of hydraulic pressure in a tail rotor (T/R) hydraulic system, which could result in loss of T/R flight control and subsequent loss of control of the helicopter.
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Required Actions
revising the rotorcraft flight manual (RFM) to perform the yaw load compensator check (ACCU TST switch) after rotor shut-down instead of during preflight procedures, and to state that the yaw servo hydraulic switch (collective switch) must be in the ``ON'' (forward) position before taking off, modifying the yaw servo hydraulic switch, and replacing the bistable ACCU TST button with a monostable button.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
Airbus Helicopters Model AS350B3 helicopters with a dual hydraulic system installed, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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