NTSB Identification: MIA89IA030.
The docket is stored on NTSB microfiche number 38710.
Incident occurred Saturday, November 12, 1988 in DAYTONA BEACH, FL
Probable Cause Approval Date: 06/11/1990
Aircraft: HUGHES 269A, registration: N37632
Injuries: 2 Uninjured.

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

DURING NORMAL CRUISE FLT, THE MAIN ROTOR DRIVE SYSTEM FAILED FOR UNDETERMINED REASON(S). GRASS WAS IGNITED BY EXHAUST GASSES AFTER TOUCHDOWN, RESULTING IN FIRE, DESTROYING THE HELICOPTER. EXAMINATION OF ENG COMPARTMENT REVEALED NO EVIDENCE OF CATASTROPHIC FAILURE OR MALFUNCTION OF THE TRANSMISSION DRIVE ASSY. THE PLT STATED HE BELIEVES THE LOSS OF MAIN ROTOR DRIVE MAY HAVE BEEN DUE TO BELT OR IDLER PULLEY CABLE STRETCH. THE TOTAL NO. OF TRANSMISSION DRIVE BELTS OPERATING WHEN THE LOSS OF MAIN ROTOR DRIVE OCCURRED COULD NOT BE DETERMINED. ACCORDING TO THE PLT A 2 BELTS WILL DRIVE THE TRANSMISSION. HE ALSO STATED THAT ACCORDING TO THE PLT THE FAILURE MAY HAVE BEEN DUE TO THE STRETCHING OF THE IDLER PULLEY CABLE OR THE TRANSMISSION DRIVE BELTS. THE TENSION OF THE IDLER PULLEY CABLE WAS CHECKED APRX 12 HRS PRIOR TO THE ACCIDENT AND SCHEDULED TO BE RECHECKED AFTER 13 HRS OF OPERATION.

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

ROTOR DRIVE SYSTEM,ENGINE TO TRANSMISSION DRIVE..UNDETERMINED

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