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NTSB Report
April 28, 1982 · Bell 47G-3B-1 · N48217
Vermal, UT
Overview
Report Status
Preliminary report
Event Type
Accident
Date
April 28, 1982
Injury Outcomes
3 injuries (3 serious injuries)
Location
Vermal, UT
Aircraft
Bell 47G-3B-1
Tail Number
N48217
Operator
Intermountain Survey
Injuries
Serious
Aircraft Damage
Substantial
NTSB Number
DEN82FTM11
THE PILOT STATED THAT HE EXPERIENCED A PARTIAL LOSS OF ENGINE POWER DURING LANDING AT AN ELEVATION OF ABOUT 5280 FT MSL. THE TEMPERATURE WAS ABOUT 50 DEGREES FAHRENHEIT. HE APPLIED FULL THROTTLE, BUT THE RPM DECAYED AND THE PLANE CRASH LANDED. A PARTIAL ENGINE TEARDOWN REVEALED THAT THE GROUNDING WIRE ON THE RIGHT MAGNETO WAS DISCONNECTED. ON THIS MAGNETO, A BENDIX S-200, THE DISCONNECTED WIRE WOULD CAUSE THE MAGNETO TO GROUND OUT AND CEASE FUNCTIONING. WITH ONE MAGNETO GROUNDED, THERE WOULD BE A LOSS OF ABOUT 200 RPM.
Full Narrative
THE PILOT STATED THAT HE EXPERIENCED A PARTIAL LOSS OF ENGINE POWER DURING LANDING AT AN ELEVATION OF ABOUT 5280 FT MSL. THE TEMPERATURE WAS ABOUT 50 DEGREES FAHRENHEIT. HE APPLIED FULL THROTTLE, BUT THE RPM DECAYED AND THE PLANE CRASH LANDED. A PARTIAL ENGINE TEARDOWN REVEALED THAT THE GROUNDING WIRE ON THE RIGHT MAGNETO WAS DISCONNECTED. ON THIS MAGNETO, A BENDIX S-200, THE DISCONNECTED WIRE WOULD CAUSE THE MAGNETO TO GROUND OUT AND CEASE FUNCTIONING. WITH ONE MAGNETO GROUNDED, THERE WOULD BE A LOSS OF ABOUT 200 RPM.
Flight
Event TypeAccident
Event Time11:00 MDT
Nearest AirportVERMAL (0nm N)
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 47G-3B-1
Tail NumberN48217
Aircraft CategoryHeli
DamageSubstantial
OperatorIntermountain Survey
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · TVO-435 · Reciprocating · 200
Seats3
People & Injuries
Injury Summary3 injuries (3 serious injuries)
Fatal0
Serious3
Minor0
Uninjured0
Total3
Crew 1Age 41 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility50 sm
CeilingNone
Temperature / Dew Point12 C / 0 C
Altimeter0