AD 2021-09-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Helicopters Deutschland GmbH | Airworthiness Directives; Airbus Helicopters Deutschland GmbH Helicopters |
| aircraft | Aviat | Various | Airworthiness Directives; Airbus Helicopters Deutschland GmbH Helicopters |
Unsafe Condition
A ruptured and displaced tie bar inside the piston of the longitudinal single-axis actuator of the main rotor actuator (MRA) could result in reduced control of the helicopter and could result in a forced landing with consequent damage to the helicopter and injury to occupants.
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Required Actions
Inspect the affected single-axis actuators for corrosion, report inspection findings, and replace affected single-axis actuators that have corrosion. Option for repetitive replacement or repetitive inspection for corrosion (and repair if necessary) of the tie bar located in an affected single-axis actuator.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
Airbus Helicopters Deutschland GmbH Model EC135 P1, EC135 P2, EC135 P2+, EC135 P3, EC135 T1, EC135 T2, EC135 T2+, EC135 T3, EC635 P2+, EC635 P3, EC635 T1, EC635 T2+, and EC635 T3 helicopters, all variants, all serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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