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NTSB Report
July 28, 1990 · Bell BH-214 · N314RM
Thompson Falls, MT
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 28, 1990
Injury Outcomes
No injuries (4 uninjured)
Location
Thompson Falls, MT
Aircraft
Bell BH-214
Tail Number
N314RM
Injuries
None
Aircraft Damage
Substantial
NTSB Number
SEA90LA148
THE CREW OF THE BELL 214B-1 HELICOPTER ATTEMPTED A FORCED LANDING AFTER THE FAILURE OF THE MAIN DRIVESHAFT ASSEMBLY WHILE THEY WERE IN CRUISE FLIGHT. THE SKIDS DUG INTO SOFT GROUND, CAUSING THE NOSE TO PITCH FORWARD. THE SKIDS LEFT THE AIRFRAME AND THE TAILBOOM WAS STRUCK BY A MAIN ROTOR BLADE. A PINCHED O-RING HAD PERMITTED MOST OF THE LUBRICANT TO BE EVACUATED FROM PART OF THE MAIN DRIVE ASSEMBLY.
NTSB Probable Cause
CREW'S ENCOUNTER WITH SOFT TERRAIN WHILE ATTEMPTING AN AUTOROTATION LANDING AFTER THE FAILURE OF THE MAIN ROTOR DRIVE SYSTEM.
Full Narrative
THE CREW OF THE BELL 214B-1 HELICOPTER ATTEMPTED A FORCED LANDING AFTER THE FAILURE OF THE MAIN DRIVESHAFT ASSEMBLY WHILE THEY WERE IN CRUISE FLIGHT. THE SKIDS DUG INTO SOFT GROUND, CAUSING THE NOSE TO PITCH FORWARD. THE SKIDS LEFT THE AIRFRAME AND THE TAILBOOM WAS STRUCK BY A MAIN ROTOR BLADE. A PINCHED O-RING HAD PERMITTED MOST OF THE LUBRICANT TO BE EVACUATED FROM PART OF THE MAIN DRIVE ASSEMBLY.
Flight
Event TypeAccident
Event Time19:05 MDT
Nearest Airport0nm N
Runway0
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell BH-214
Tail NumberN314RM
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsLycoming · T5508D · Turboshaft · 2250
Seats12
People & Injuries
Injury SummaryNo injuries (4 uninjured)
Fatal0
Serious0
Minor0
Uninjured4
Total4
Crew 1Age 43 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind270° @ 4 kt
Visibility50 sm
CeilingNone
Temperature / Dew Point57 / 0 C
Altimeter0
Observation Time19:05
Weather SourcePILO