Main Rotor Drive — Main Gearbox Freewheel Shafts — Replacement ; Placards and Markings — ENG1 Training Idle Switch — Installation / Operational Restriction
- Published
- Effective
- Deadline
- Replaces
- 2020-0141
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of AS 332 L2 helicopters with affected main gearboxes must install placards prohibiting the use of the ENG1 Training Idle switch in flight within 50 flight hours after 8 July 2020. They must determine flight hours accumulated on affected parts and replace the main gearbox within specified flight hour limits. Reporting of flight hours to Airbus Helicopters is required within 7 days of determination. Placards and operational restrictions can be removed once a serviceable main gearbox is installed.
Summary
EASA Airworthiness Directive 2020-0141R1 is an updated regulatory requirement affecting Airbus Helicopters AS 332 L2 models. It addresses the replacement of main gearbox freewheel shafts and installation of placards related to the ENG1 Training Idle switch to impose operational restrictions during flight. The directive aims to ensure continued airworthiness and safe operation of helicopters equipped with specific main gearbox configurations.
What changed
This revision clarifies the wording of the placard prohibiting the use of the ENG1 Training Idle switch, specifying that the restriction applies only during flight and not during ground or maintenance operations. It updates the original AD 2020-0141 by incorporating Airbus Helicopters Alert Service Bulletin Revision 1 and adjusts compliance instructions accordingly.
Why it matters
The directive addresses a potential unsafe condition caused by wear and damage in the main gearbox freewheel shafts, which could reduce the helicopter's ability to transfer power during one engine inoperative scenarios. Compliance is critical for operators and maintenance organizations to maintain flight safety and regulatory conformity, particularly during operational training flights involving engine idle settings.
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- EASA AD 2023-0148R1Main Rotor Drive – Main Gearbox – Replacement; Placards and Markings – ENG1 Training Idle Switch – Installation / Operational RestrictionJul 24, 2026
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