NTSB Identification: LAX85FJA03.
The docket is stored on NTSB microfiche number 28782.
Accident occurred Thursday, February 14, 1985 in HILO, HI
Aircraft: HUGHES 369D, registration: N58395
Injuries: 2 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 HELICOPTER TAIL BOOM WAS DAMAGED BY THE MAIN ROTOR BLADES DURING A FORCED AUTOROTATIVE LANDING. THE PLT REPORTED THAT SHORTLY AFTER TAKEOFF AT AN ALT OF 4500 FT MSL, THE ENG N2 DROPPED TO 92% AND APRX 15 SECONDS LATER, THE ENG FLAMED OUT. INVESTIGATION REVEALED THE HELICOPTER WAS FUELED WITH AVGAS INSTEAD OF TURBINE FUEL JUST PRIOR TO TAKEOFF. THE ENG OPERATING MANUAL APPROVES OF THIS FUEL SUBSTITUTION IN EMERGENCY SITUATIONS, HOWEVER, IT ADVISED THAT WHEN AVGAS IS USED, THE FUEL BOOST PUMP MUST BE LEFT ON. THE PLT WAS UNABLE TO RECALL WHETHER OR NOT THE PUMP WAS ON.

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

FUEL SYSTEM..IMPROPER USE OF..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..CROP


Contributing Factors

FLUID,FUEL..OTHER

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