NTSB Identification: MKC89FA004.
The docket is stored on NTSB microfiche number 38595.
Accident occurred Saturday, October 08, 1988 in BRANSON, MO
Probable Cause Approval Date: 05/07/1993
Aircraft: HUGHES 500C, registration: N506WW
Injuries: 4 Serious,2 Minor.
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 FLIGHT WAS CONDUCTED FOR SIGHTSEEING WITH 5 PASSENGERS ONBOARD. THE PILOT TURNED ON FINAL APPROACH WITH 35 KNOTS OF AIRSPEED AND ENCOUNTERED A HIGH RATE OF DESCENT. THE PILOT REPORTED THAT HE NOTED A SPLIT TACH AND INITIATED AN AUTOROTATION, BUT WAS OUTSIDE THE ENVELOPE FOR A SAFE RECOVERY. THE SKIDS COLLAPSED IN THE RESULTING HARD LANDING, AND THE HELICOPTER ROLLED OVER. METAL FLECKS WERE FOUND IN THE FREEWHEELING SPRAG ASSEMBLY, WHICH HELD VERY LITTLE OIL, BUT NO EVIDENCE OF SLIPPAGE WAS FOUND.
The National Transportation Safety Board determines the probable cause(s) of this accident to be:PLANNED APPROACH..IMPROPER..PILOT IN COMMAND
The National Transportation Safety Board determines the probable cause(s) of this accident to be:ROTOR RPM..NOT MAINTAINED..PILOT IN COMMAND
The National Transportation Safety Board determines the probable cause(s) of this accident to be:EMERGENCY PROCEDURE..NOT POSSIBLE
ROTOR DRIVE SYSTEM,FREEWHEELING SPRAG UNIT..SLIPPED
AIRSPEED..INADEQUATE..PILOT IN COMMAND
MANEUVER..EXCESSIVE..PILOT IN COMMAND
REMEDIAL ACTION..DELAYED..PILOT IN COMMAND
PROPER DESCENT RATE..EXCEEDED..PILOT IN COMMAND
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