Summary
We are adopting a new airworthiness directive (AD) for Airbus Helicopters Model MBB-BK 117 C-2 helicopters with certain duplex trim actuators installed. This AD requires repetitively inspecting the lateral and longitudinal trim actuator output levers for correct torque of the nuts. This AD was prompted by a design review that indicated the attachment screws can become loose under certain circumstances. These actions are intended to prevent the loss of an attachment screw, which could result in movement of the output lever in an axial direction, contact of a bolt connecting the control rod to an output lever with the actuator housing, and subsequent loss of helicopter control.
Directive Details
AD Number
FAA-2014-0578
Document Number
2016-24860
Type
Rule
Publication Date
October 20, 2016
Effective Date
November 25, 2016
Affected Manufacturer
Airbus Helicopters Deutschland GmbH (Previously Eurocopter Deutschland GmbH) (Airbus Helicopters)
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2014-0578
Topics
Official Documents
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