Rotors Flight Control — Cyclic Stick — Modification
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected EC135 and EC635 helicopters must modify the cyclic stick flight control system by installing the specified weight compensation as detailed in Airbus Helicopters Alert Service Bulletins EC135-67A-032 and EC135H-67A-003. This modification must be completed within seven months from the effective date of 5 April 2018. Alternative compliance methods may be approved by EASA if properly substantiated.
Summary
EASA Airworthiness Directive 2018-0063 is an official safety directive issued by the European Union Aviation Safety Agency affecting Airbus Helicopters Deutschland GmbH EC135 and EC635 helicopter models. It addresses a flight control system issue related to the cyclic stick on these helicopters, specifically those equipped with autopilot and within certain serial number ranges. The directive mandates a modification to improve flight safety by installing a weight compensation for the cyclic stick.
What changed
This new airworthiness directive introduces a required modification to the cyclic stick flight control system on affected EC135 and EC635 helicopters. The modification involves installing a weight compensation to prevent uncommanded disengagement of the main rotor trim actuators during autopilot operation, which could cause hazardous flight conditions.
Why it matters
This directive is critical for aviation professionals because it addresses a potential safety risk that could lead to loss of control of the helicopter if not corrected. Operators and maintenance organizations must ensure compliance to maintain airworthiness and avoid unsafe flight conditions. Compliance also ensures adherence to European regulatory requirements and helps prevent incidents related to flight control system failures.
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