EASA AD 2025-0029: Main Rotor — Swashplate — Inspection

What to do

Operators of MBB-BK117 D-3 and D-3m helicopters with affected swashplates must perform the required inspection within 440 flight hours from 21 February 2025, the effective date of the directive. If any discrepancies are found during inspection, corrective actions must be completed before the next flight. Installation of affected parts is only allowed if they have been inspected and cleared according to the directive's instructions.

Summary

EASA Airworthiness Directive 2025-0029 is an airworthiness directive addressing the inspection of the main rotor swashplate on MBB-BK117 D-3 and D-3m helicopters. It specifically targets swashplates with Part Number D623M2050102 and serial numbers up to 0487 inclusive, except those already subjected to a supplementary inspection. The directive mandates a one-time inspection and corrective actions to ensure continued safe operation of affected helicopters.

What changed

This new airworthiness directive introduces a mandatory one-time inspection of the swashplate assembly due to a reported issue with incorrect installation of the angular ball bearing, which can cause wear and axial play. It requires operators to inspect affected parts within 440 flight hours and perform corrective actions if discrepancies are found. Additionally, it sets conditions for installing inspected swashplates on helicopters.

Why it matters

This directive is critical for aviation professionals because it addresses a safety risk that could lead to reduced helicopter control due to wear in the swashplate assembly. Operators and maintenance organizations must comply to prevent potential in-flight vibrations and control issues. Ensuring compliance maintains airworthiness and avoids operational disruptions or safety incidents.

What to do

Summary

What changed

Why it matters

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