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NTSB Report
July 4, 1992 · Bell 47G5 · N4798R
Mesa, AZ
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 4, 1992
Injury Outcomes
1 injury (1 minor injury)
Location
Mesa, AZ
Aircraft
Bell 47G5
Tail Number
N4798R
Operator
Red Mountain Helicopters
Injuries
Minor
Aircraft Damage
Destroyed
NTSB Number
LAX92LA278
ACCORDING TO A WITNESS, THE PILOT WAS PERFORMING A TAKEOFF AFTER THE HELICOPTER HAD BEEN LOADED WITH ABOUT 60 GALLONS OF INSECTICIDE. THE HELICOPTER ATTAINED AN ALTITUDE OF ABOUT 50 TO 60 FEET ABOVE THE GROUND WHEN THE WITNESS OBSERVED THE TAIL ROTOR MOVE LATERALLY ABOUT 4 TO 5 FEET. THE WITNESS SAID HE SAW THE AIRCRAFT SETTLE TO THE GROUND AND LAND HARD. HE SAID HE IMMEDIATELY ASKED THE PILOT WHAT HAPPENED. THE PILOT REPORTEDLY TOLD THE WITNESS THAT HE HAD A 'POWER DROOP.' THE CAUSE OF THE PARTIAL LOSS OF POWER WAS NOT DETERMINED.
NTSB Probable Cause
A PARTIAL LOSS OF ENGINE POWER DUE TO UNKNOWN REASON (S). FACTORS IN THIS ACCIDENT WERE 1) LOW ALTITUDE WHEN THE PARTIAL LOSS OF POWER OCCURRED 2) LOW ROTOR RPM AS A RESULT OF THE LOSS OF POWER, AND 3) THE PILOT NOT BEING ABLE TO TAKE REMEDIAL ACTION DUE TO THE LOW ALTITUDE AND ROTOR RPM.
Full Narrative
ACCORDING TO A WITNESS, THE PILOT WAS PERFORMING A TAKEOFF AFTER THE HELICOPTER HAD BEEN LOADED WITH ABOUT 60 GALLONS OF INSECTICIDE. THE HELICOPTER ATTAINED AN ALTITUDE OF ABOUT 50 TO 60 FEET ABOVE THE GROUND WHEN THE WITNESS OBSERVED THE TAIL ROTOR MOVE LATERALLY ABOUT 4 TO 5 FEET. THE WITNESS SAID HE SAW THE AIRCRAFT SETTLE TO THE GROUND AND LAND HARD. HE SAID HE IMMEDIATELY ASKED THE PILOT WHAT HAPPENED. THE PILOT REPORTEDLY TOLD THE WITNESS THAT HE HAD A 'POWER DROOP.' THE CAUSE OF THE PARTIAL LOSS OF POWER WAS NOT DETERMINED.
Flight
Event TypeAccident
Event Time21:14 MST
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 47G5
Tail NumberN4798R
Aircraft CategoryHeli
DamageDestroyed
OperatorRed Mountain Helicopters
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · VO-435-B1A · Reciprocating · 260
Seats2
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 31 · Second Class
Conditions
ConditionsVMC
LightBright Night
Wind340° @ 4 kt
Visibility30 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter0
Weather SourceWIT