Superseding AD Proposed for AStar MGB Particle Inspections

The FAA has proposed to supersede Airworthiness Directive (AD) 2025-06-04, issued in April 2025, which applies to certain Airbus Helicopters Model AS350 and AS355 helicopters. As NAAA previously reported, AD 2025-06-04 requires repetitively inspecting the main gearbox (MGB) bevel wheel and the MGB magnetic plug for particles and performing corrective actions if applicable and prohibits installing an affected MGB unless certain requirements are met.

Since AD 2025-06-04 was issued, the FAA determined that it contains errors in the interval compliance times. Specifically, the interval compliance time should be 100 hours time-in-service (TIS) instead of 30 hours TIS. This proposed AD would continue to require the actions of AD 2025-06-04 and revise the interval compliance time.

You can view the proposed AD here. Comments are due January 9, 2026.