Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
Key claim: Operators of Airbus Helicopters MBB-BK 117 C-1 helicopters must repeatedly check the louver box assembly for play and repair it if needed, after one detached in flight because it was installed incorrectly.
Abstract
(Rule · Transportation Department, Federal Aviation Administration) The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH (AHD) Model MBB-BK 117 C-1 helicopters. This AD was prompted by a report of a louver box assembly detaching in flight due to incorrect installation. This AD requires repetitively accomplishing a play check of the affected louver box assembly and, depending on the results of the check, accomplishing corrective actions. The FAA is issuing this AD to address the unsafe condition on these products.
Why this matters
This is another in a steady stream of helicopter-specific FAA airworthiness directives triggered by a single in-flight parts failure traced to an installation error. It reinforces the pattern of using repetitive inspection ADs — rather than one-time corrective action — to catch latent assembly defects on legacy rotorcraft fleets.