Main Rotor — Pitch Rod Upper Links — Marking / Inspection
- Published
- Effective
- Deadline
- Replaces
- 2021-0048
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected helicopters must apply alignment markings on the pitch rod upper link screws within specified flight hour limits after 2 March 2021 and conduct visual inspections every 10 flight hours thereafter. If misalignment is found, corrective actions must be taken before the next flight. Alternatively, operators can install the new modification service bulletin to terminate repetitive inspections. Installation of affected parts is prohibited after modification or from the effective date for helicopters without affected parts.
Summary
EASA Airworthiness Directive 2023-0064 is issued for Airbus Helicopters AS 350, EC 130, AS 355, AS 365, and SA 365 models. It addresses the main rotor pitch rod upper links, specifically the pitch rod lever axis attachment screws with Part Number 350A31-1873-20, requiring marking and inspection to detect loss of screw torque. The directive aims to prevent potential loss of control due to failure of these components.
What changed
This directive supersedes EASA AD 2021-0048 and retains its requirements for marking and repetitive inspections of the main rotor pitch rod upper links. It introduces an optional modification using a newly designed pitch rod lever axis attachment screw as terminating action for repetitive inspections and prohibits installation of affected parts after modification or from the effective date for unaffected helicopters.
Why it matters
This AD is critical for maintaining helicopter flight safety by preventing loss of main rotor pitch rod upper links, which could lead to loss of control. Operators and maintenance organizations must ensure compliance to avoid increased vibrations and potential mechanical failures. The directive also streamlines inspection intervals and offers a modification option to reduce ongoing maintenance burden.
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