NTSB Identification: DEN84FA073.
The docket is stored on NTSB microfiche number 24824.
Accident occurred Sunday, January 22, 1984 in HUNTINGTON, UT
Aircraft: BELL 206L-1, registration: N500CN
Injuries: 4 Serious,1 Minor,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.

WHILE IN A STABILIZED, OUT-OF-GROUND-EFFECT HOVER, AT ABOUT 300 FEET AGL, THE HELICOPTER STARTED AN UNCONTROLLABLE RIGHT TURN. THE PLT STATED THAT USING FULL LEFT PEDDLE HAD NO EFFECT ON STOPPING THE SPIN. AT THE ONSET OF THE SPIN, THE OCCUPANTS OF THE ACFT FELT A HIGH FREQUENCY VIBRATION. THE PLT STATED THAT HE REDUCED THE ROTOR RPM BY ROLLING OFF THE THROTTLE & LOWERED THE COLLECTIVE. THE HELICOPTER DESCENDED INTO TREES IN A RIGHT SPIN. THE PLT STATED THAT HE DID NOT BELIEVE THAT THERE WAS ANYTHING MECHANICALLY WRONG WITH THE ACFT. THE COPLT STATED THAT HE FELT THAT THEY HAD EXPERIENCED A LOSS OF TAILROTOR AUTHORITY. INVESTIGATION REVEALED NO MECHANICAL PROBLEMS WITH THE HELICOPTER. REVIEW OF HEIGHT-VELOCITY CHART FOR THE BELL 206L-1 INDICATED THAT A SUCCESSUL AUTO-ROTATION FROM HOVER A 300 FEET AGL IS NOT PROBABLE. THE ELEVATION OF THE CRASH SITE WAS APRX 6800 FT MSL.

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

IN-FLIGHT PLANNING/DECISION..IMPROPER..PILOT IN COMMAND

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

DIRECTIONAL CONTROL..NOT MAINTAINED..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..HIGH OBSTRUCTION(S)


Contributing Factors

WEATHER CONDITION..HIGH DENSITY ALTITUDE


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

LACK OF TOTAL EXPERIENCE IN TYPE OF AIRCRAFT..PILOT IN COMMAND

Index for Jan1984 | Index of months