DCA/BK117/14 — Emergency Airworthiness Directive Kawasaki BK117 Series

This AD is prompted by continuing airworthiness information received from the manufacturer and the state of design regulatory authority. Investigation of an incident overseas revealed a fault may occur in the winch controls, which causes it to continue raising or lowering the cable uncontrollably. The fault may cause the winch motor to keep running even after the “RESCUE WINCH’ switch is elected off. If this fault occurs the only way to prevent serious injury to persons on the winch or damage to the helicopter is to remove power to the electrical bus that supplies the winch, and land as soon as practicable.

DCA/BK117/14 Winch - Emergency Procedure

Applicability: BK117 Series, except BK117 C-2 series

Requirement: To prevent uncontrolled raising or lowering of the rescue winch cable, insert a copy of Kawasaki Service Bulletin No KSB-117-236 into the emergency procedures section of the Aircraft Flight Manual. This SB contains procedures to remove power to the winch in an emergency runaway situation by opening the bus tie and selecting the No 1 generator to OFF. (JCAB AD TCD-6482-2004 refers)

Compliance: Before 1 August 2004

Effective Date: 29 July 2004

FMI: www.caa.govt.nz/fulltext/nzcars/Emergency/DCA_BK117_14.pdf