EASA EAD 2014-0046-E: MBB-BK 117 C-2 helicopters
EASA EAD 2014-0046-E: MBB-BK 117 C-2 helicopters: Optional Equipment - External Rescue Hoist System - Deactivation
In a recent incident involving an MBB-BK 117 C-2 helicopter, the rescue hoist
damper unit detached from the cable when the hoist damper was lifted by hand
(no load attached).
Subsequent investigation revealed that the detachment occurred because a
retaining ring inside the damper unit was not located at its correct installation
position. It was determined that the displacement of the retaining ring may
occur as a maintenance induced error, or as a result of retaining ring interaction
with the bonding strap unit during operation.
This condition, if not detected and corrected, could lead to the detachment of
an external load or person from the helicopter hoist, possibly resulting in
personal injury, or injury to persons on the ground.
For the reason described above, this AD requires replacement of the affected
rescue hoist damper units, or deactivation of the rescue hoist.
This AD is considered a temporary measure and further AD action may follow.
http://www.caa.co.uk/docs/33/2014022...D20140046E.pdf