Airworthiness DirectiveEASA AD 2016-0145R1

Main Rotor — Main Rotor Damper — Inspection / Replacement

Published: Jan 17, 2018
Effective: Jan 17, 2018
Replaces: 2016-0145
Replaces: 2016-0088

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What to do

Operators of AW189 helicopters equipped with the affected main rotor damper must perform torque checks within 10 flight hours and conduct one-time and repetitive inspections including dye penetrant, eddy current, and visual inspections as specified. Replacement of the damper with the improved part number 8G6220V00151 is recommended as an optional terminating action. Compliance with inspection intervals and corrective actions must be strictly followed to maintain airworthiness.

Summary

EASA Airworthiness Directive 2016-0145R1 is an updated regulatory document addressing inspection and replacement requirements for the main rotor damper Part Number 4F6220V00251 installed on Leonardo S.p.A AW189 helicopters. The directive mandates inspections and corrective actions to prevent failure of the main rotor damper, which could lead to loss of lead-lag damping function and reduced helicopter control. It applies to all serial numbers of AW189 helicopters equipped with the specified damper.

What changed

This revision of EASA AD 2016-0145 introduces the option to install an improved main rotor damper Part Number 8G6220V00151 as a terminating action for the repetitive inspections previously required. It also incorporates additional inspection methods such as eddy current inspections as alternatives to dye penetrant and visual inspections. The revision updates compliance times and inspection procedures based on new findings and improved parts availability.

Why it matters

This directive is critical for aviation professionals as it addresses a known unsafe condition that could lead to main rotor damper failure and potential loss of helicopter control. Operators and maintenance organizations must comply to ensure continued airworthiness and safety of AW189 helicopters. The AD provides clear inspection intervals and corrective actions to detect and mitigate damper cracks or damage, thereby preventing in-flight failures and costly repairs.

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