Airworthiness Directive · Amendment 39-23491 · Air conditioning system
Airbus Helicopters Deutschland GmbH (AHD) Helicopters
This AD applies to all Airbus Helicopters Deutschland GmbH (AHD) Model MBB-BK 117 C-1 helicopters, certificated in any category.
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.
(1) Before the first flight of each day, accomplish a play check of the louver box assembly of the vapor cycle air cooling system part number (P/N) 117-820014, as depicted in Figure 1 to paragraph (g)(1) of this AD, by pulling it upward by hand on all four corners. The owner/operator (pilot) holding at least a private pilot certificate may accomplish this play check, and must enter compliance into the helicopter maintenance records in accordance with 14 CFR 43.9(a) and 91.417(a)(2)(v). The record must be maintained as required by 14 CFR 91.417, 121.380, or 135.439.
(2) If there is any play found during any check required by paragraph (g)(1) of this AD, before further flight, accomplish corrective actions in accordance with a method approved by the Manager, International Validation Branch, FAA; or EASA; or AHD's EASA Design Organization Approval (DOA). If approved by the DOA, the approval must include the DOA-authorized signature.
Although the material referenced in EASA AD 2026-0152 specifies to submit certain information to the manufacturer, this AD does not include that requirement.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
