NTSB Identification: DEN88FA151.
The docket is stored on NTSB microfiche number 37803.
Accident occurred Sunday, July 10, 1988 in DUBOIS, WY
Probable Cause Approval Date: 12/03/1989
Aircraft: AEROSPATIALE SA-315B, registration: N47274
Injuries: 1 Serious.
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 PLT WAS CONDUCTING AN EXTERNAL LOAD OPERATION AT THE TIME OF THE ENG FAILURE. THE PLT STATED THAT HE WAS HOVERING AT APRX 200 FT AGL (8,700 FT MSL) WHEN HE NOTICED THE ENG HAD FLAMED OUT. HE RELEASED THE EXTERNAL LOAD AND ATTEMPTED TO AUTOROTATE TO A CLEARING. THE HELICOPTER COLLIDED WITH TREES. THE POST CRASH EXAM OF HELICOPTER REVEALED NO EVIDENCE OF PRE-IMPACT MECHANICAL MALFUNCTION OR FAILURE OF THE STRUCTURE, FLT CONTROLS OR ROTOR SYSTEMS. THE ENG REVEALED EVIDENCE OF AN OVER TEMP CONDITION TO THE TURBINE SECTION. THE DENSITY ALT AT THE ACCIDENT SITE WAS 11,300 FT.
The National Transportation Safety Board determines the probable cause(s) of this accident to be:TURBOSHAFT ENGINE,FREE(POWER) TURBINE..OVERTEMPERATURE
WEATHER CONDITION..HIGH DENSITY ALTITUDE
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