NTSB Identification: ATL86LA251.
The docket is stored on NTSB microfiche number 33036.
Accident occurred Saturday, September 06, 1986 in WATERLOO, AL
Aircraft: Hughes 369HS/H-500, registration: N9181F
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE ACFT LIFTED OFF THE TOP OF THE SUPPORT TRUCK AND STARTED A TAKEOFF WITH A PARTIAL LOAD OF CHEMICALS TO BE APPLIED TO A LOGGED OVER FOREST AREA. ABOUT 10-15 FEET AFTER LIFT OFF THE PLT DETECTED A LOSS OF ROTOR RPM. HE WAS AT THE EDGE OF A RAVINE WITH STEEP SIDES AND HAD NO LANDING AREA AVAILABLE. HE DESCENDED THE SIDE OF THE RAVINE AND PERFORMED A MODIFIED AUTOROTATION INTO THE TOPS OF THE TREES AT THE BOTTOM OF THE RAVINE. THE GROUND SUPPORT MAN REPORTED SEEING A PUFF OF SMOKE AT ABOUT THE TIME THE PLT REPORTED THE POWER LOSS. THE ACFT WAS RECOVERED AND EXAMINED. NO MALFUNCTIONS WERE DISCOVERED WHICH PREVENTED THE ENG FROM RUNNING. THE ENG WAS REMOVED AND SHIPPED TO THE FACTORY WHERE IT WAS RUN IN A TEST CELL. IT PERFORMEDWELL. A RECORDS CHECK REVEALED THAT HE ENG WAS SHIPPED TO BELL HELICOPTER AS A NEW 'O' TIME ENGINE. IT WAS INSTALLED IN THE HUGHES APPROXIMATELY 19 MONTHS PRIOR TO THE ACCIDENT. THE INSTALLATION WAS INSPECTED AND APPROVED BY THE FAA.

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

REASON FOR OCCURRENCE UNDETERMINED

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