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NTSB Report
January 8, 1985 · Bell 206B · N59549
Trimmer, CA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
January 8, 1985
Injury Outcomes
1 injury (1 minor injury)
Location
Trimmer, CA
Aircraft
Bell 206B
Tail Number
N59549
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
LAX85FA101
THE PLT STATED THE HELICOPTER LOST PWR DURING CRUISE WHEN HE ATTEMPTED TO ADD PWR TO CLIMB. HE STATED THAT N2 DECREASED ALONG WITH THE ACTIVATION OF VISUAL AND AUDIO ENGINE OUT WARNINGS. AN AUTOROTATION WAS PERFORMED TO A ROAD, HOWEVER, THE HELICOPTER SLID OFF THE ROAD AND DOWN A 50 DEG SLOPE IN THE TERRAIN BEFORE COMING TO REST. POST ACCIDENT TESTS REVEALED THE FUEL GOVERNOR, P/N 104100A12-A8, HAD AN EXCESSIVE LEAKAGE RATE AT THE BYPASS VALVUE AND THE DECELERATION AND SLOPE TESTS WERE OUT OF LIMITS. WHEN RETESTED, THE GOVERNOR WAS FOUND CAPABLE OF NORMAL OPERATION.
Full Narrative
THE PLT STATED THE HELICOPTER LOST PWR DURING CRUISE WHEN HE ATTEMPTED TO ADD PWR TO CLIMB. HE STATED THAT N2 DECREASED ALONG WITH THE ACTIVATION OF VISUAL AND AUDIO ENGINE OUT WARNINGS. AN AUTOROTATION WAS PERFORMED TO A ROAD, HOWEVER, THE HELICOPTER SLID OFF THE ROAD AND DOWN A 50 DEG SLOPE IN THE TERRAIN BEFORE COMING TO REST. POST ACCIDENT TESTS REVEALED THE FUEL GOVERNOR, P/N 104100A12-A8, HAD AN EXCESSIVE LEAKAGE RATE AT THE BYPASS VALVUE AND THE DECELERATION AND SLOPE TESTS WERE OUT OF LIMITS. WHEN RETESTED, THE GOVERNOR WAS FOUND CAPABLE OF NORMAL OPERATION.
Flight
Event TypeAccident
Event Time09:15 PST
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 206B
Tail NumberN59549
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20B · Turboshaft · 317
Seats5
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 40 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind310° @ 5 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point48 / 43 C
Altimeter30.00 inHg
Observation Time16:51
Weather SourcePILO