NTSB Identification: SEA82FA070
Nonscheduled 14 CFR Part 135: Air Taxi & Commuter
Accident occurred Thursday, May 13, 1982 in 6NM SSE WRANGEL, AK
Probable Cause Approval Date: 05/13/1983
Aircraft: HUGHES 369D, registration: N1107T
Injuries: 1 Minor,3 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE PILOT REPORTED THAT THE AIRCRAFT WAS ON A RECONNAISSANCE FLIGHT TO SURVEY A PROPOSED POWERLINE PROJECT. HE REPORTED THAT DURING THE FLIGHT, THE ENGINE FLAMED OUT AND AN AUTOROTATION WAS INITIATED. HE MANEUVERED THE HELICOPTER TO LAND IN A CLEARANCE, BUT STRUCK THE TOP OF A TREE ABOUT 35 FT AGL. THE HELICOPTER THEN TRAVELED 90 FT HORIZONTALLY AND IMPACTED ON SOFT, SLOPING MUSKEG. AN EXAMINATION OF THE AIRCRAFT AND ENGINE REVEALED NO PREIMPACT FAILURES. THE ENGINE PERFORMED NORMALLY DURING AN OPERATIONAL CHECK. ACCORDING TO THE PILOT AND PASSENGERS, THE HELICOPTER HAD BEEN FLOWN THROUGH AT LEAST ONE AREA OF WET SNOWSHOWERS. HOWEVER, THE INTENSITY OF THE SHOWERS WAS NOT DETERMINED. THE HELICOPTER WAS EQUIPPED WITH AUTO-IGNITION, AN ANTI-ICE SYSTEM, AND A MODIFICATION TO THE ENGINE INLET SCREEN AND INSPECTION DOOR TO REDUCE FOD AND SNOW INGESTION.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

MISCELLANEOUS..UNDETERMINED




Contributing Factors

OBJECT..TREE(S)


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

TERRAIN CONDITION..DOWNHILL


Contributing Factors

TERRAIN CONDITION..WET


Contributing Factors

TERRAIN CONDITION..SOFT

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