Final rule · 2026-11560

Airworthiness Directives; Airbus Helicopters

The FAA is superseding Airworthiness Directive (AD) 2025-06-04 for all Airbus Helicopters Model AS350B, AS350B1, AS350B2, AS350B3, AS350BA, AS350D, AS355E, AS355F, AS355F1, AS355F2, AS355N, AS355NP, EC130B4, and EC130T2 helicopters. AD 2025-06-04 required repetitively inspecting the main gearbox (MGB) bevel wheel and the MGB magnetic plug for particles and performing corrective actions if applicable and prohibited installing an affected MGB unless certain requirements were met. Since the FAA issued AD 2025-06-04, the FAA determined that AD 2025-06-04 contains errors in the interval compliance times. This AD continues to require the actions of AD 2025-06-04 and corrects the interval compliance times. The FAA is issuing this AD to address the unsafe condition on these products.