Friday, April 12, 2013

DGCA/NEW-MISC/153R2

SUBJECT- FAILURE OF OVERLOAD CLUTCH RESULTING IN IN FLIGHT FAILURE OF THE
                  HOIST WHICH COULD RESULT IN INJURY TO PERSON BEING LIFTED 

REFERENCED : FAA EAD 2013-06-51

EAD Requirements : This EAD requires complying with specified portions of the ASB to do the
                                     following before the next flight involving a hoist operation:
                                  • Performing a cable conditioning lift;
                                  • Performing a load inspection test;
                                  • Deactivating or replacing any hoist that fails the load inspection test; and
                                  • Recording the results of the load inspection test on the hoist component 
                                    history card or equivalent record

EASA  AD 2013-0077-E, 22 March 2013 applicable to AgustaWestland S.p.A, Bell
          Helicopter Textron, Inc., Bell Helicopter Textron Canada, Ltd., Eurocopter, Eurocopter
         Deutschland, Kamov and Sikorsky helicopters. The exact list of applicable models is to
         be found in the EASA AD. This AD requires accomplishment of a hoist test.


Background
         This EAD was prompted by an incident that occurred during a maintenance check of a rescue hoist that lost the ability to hold the load at maximum rated capacity, causing the test load to strike the ground. An ECD Model MBB-BK 117 C-2 helicopter picked up a dummy load of 552 lbs. to conduct a “maximum load cycle” on the rescue hoist. Initially, the cable reeled out and stopped as commanded by the winch operator; however, the cable continued to reel-out without further command by the winch operator, causing the dummy load to strike the ground. Examination of the affected hoist determined that the overload clutch had failed. This EAD requires performing a cable conditioning lift, performing a load inspection test, and recording the results on the hoist component history card or equivalent record. These EAD actions are intended to detect conditions that may result in failure of the hoist and injury to persons being lifted.
                 The EASA issued EASA AD No. 2013-0065-E, dated March 14, 2013, to correct an unsafe condition for helicopters with certain part-numbered and serial-numbered Goodrich hoists installed. EASA advised of a report that an ECD Model MBB-BK 117 C-2 helicopter experienced an incident of its rescue hoist containing a dummy load of 552 lbs. that reeled-out without command of the operator and impacted the ground during a maintenance check flight. Examination of the affected hoist determined that the overload clutch had failed. The overload clutch design is common to many Goodrich externally-mounted rescue hoists installed on the applicable model helicopters. EASA further stated its AD action is considered an interim action and further AD action may follow.
Related Post
DGCA/NEW-MISC/153
http://avimaint.blogspot.in/2013/03/dgcanew-misc153-hoist-helicopter.html

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