EASA AD 2018-0166
Power Plant — Front Sliding Cowling — Inspection / Modification
Summary
EASA Airworthiness Directive 2018-0166 is an airworthiness directive issued for Airbus Helicopters EC175 B models with specific serial numbers. It addresses abnormal wear found in the front sliding cowling's safety system, which could lead to failure of the locking mechanism and potential in-flight loss of the cowling. The directive mandates inspections and modifications to ensure continued airworthiness and safety.
What Changed
This new directive introduces mandatory repetitive inspections of the moving parts of the front sliding cowling safety system and requires corrective actions if excessive wear is detected. It also mandates a modification of the safety system as a terminating action to prevent further wear and potential failure.
Why It Matters
This directive is critical for operators and maintenance organizations to prevent in-flight loss of the front sliding cowling, which could impact the main rotor blades and result in loss of helicopter control. Compliance ensures the safety and airworthiness of affected EC175 B helicopters, reducing risk to flight operations.
What To Do
Operators must inspect the front sliding cowling safety system within 55 flight hours or 30 days from 2018-08-09 and repeat inspections every 55 flight hours. If wear exceeds limits, repairs must be performed within 55 flight hours, followed by additional inspections. The safety system modification must be completed within three months of the effective date to terminate inspection requirements.
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