FAA AD 2026-05-11 supersedes AD 2020-09-15 for certain Airbus Helicopters AS332 models to prevent divergent aeromechanic coupling by retaining prior removal requirements and adding repetitive in-flight vibration measurements at 12 Hz after specific maintenance tasks, with corrective actions if levels exceed limits.

Applicability: Airbus Helicopters Model AS332C, AS332C1, AS332L, and AS332L1 helicopters, certificated in any category, equipped with a dual hoist installation and de-icing system.

Effective Date: April 17, 2026.

View the full AD in the FAA Dynamic Regulatory System (DRS) or the regulations.gov docket FAA-2025-5389.

Stay updated on rotorcraft airworthiness directives—check our Rotorcraft Network and AD Summaries archive for future posts on Airbus, Bell, Sikorsky, and other models.