Rotors Flight Control — Collective Controls / Protective Cover — Modification
- Published
- Effective
- Deadline
- Replaces
- 2021-0027
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of AS 355 NP helicopters with the affected pilot collective stick must replace the protective cover of the "SHEAR" control pushbutton and re-identify the collective stick within three months if the helicopter has a hoist installation, or within twelve months or upon connecting a hoist if not initially installed. Installation of the old protective cover and affected parts is prohibited from the effective date of the AD. Compliance must follow the instructions in Airbus Helicopters Alert Service Bulletin AS355-67.00.47.
Summary
EASA Airworthiness Directive 2021-0027R1 is a regulatory document addressing a modification to the collective controls protective cover on Airbus Helicopters AS 355 NP models. It mandates replacement and re-identification of the pilot collective stick protective cover for the "SHEAR" control pushbutton to prevent mechanical deformation that could lead to unintended hoist cable shearing. This directive applies to all serial numbers of AS 355 NP helicopters.
What changed
EASA Airworthiness Directive 2021-0027R1 revises the original AD 2021-0027 by correcting and reducing the applicability and amending the re-identification part number for the pilot collective stick. It introduces a requirement to replace the protective cover of the "SHEAR" control pushbutton and prohibits installation of the affected parts and old design protective covers.
Why it matters
This directive is critical for aviation professionals as it addresses a safety risk that could cause unintended activation of the hoist cable shearing function, potentially resulting in injury to hoisted persons. Operators and maintenance organizations must ensure compliance to maintain aircraft airworthiness and avoid unsafe conditions. The AD also restricts installation of non-compliant parts, impacting parts management and maintenance procedures.
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