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NTSB Report
October 9, 1992 · Bell 47G-3B-1 · N31FG
Centre, AL
Overview
Report Status
Probable Cause
Event Type
Accident
Date
October 9, 1992
Injury Outcomes
No injuries (1 uninjured)
Location
Centre, AL
Aircraft
Bell 47G-3B-1
Tail Number
N31FG
Operator
Speth Stephen F
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ATL93LA009
THE AG PILOT REPORTED THAT WHILE PERFORMING A MANEUVER (TURN TO REVERSE DIRECTION), HE ALLOWED THE MAIN ROTOR RPM TO DECAY. HE LOST CONTROL OF THE HELICOPTER, AND IT BOUNCED INTO A FIELD. THE AIRCRAFT BECAME AIRBORNE AGAIN, AND THE RPM DECAYED ONCE MORE. THE HELICOPTER THEN CRASHED INTO THE FIELD, AND THE TAIL BOOM WAS SEVERED BY THE MAIN ROTOR BLADES DURING IMPACT. THE PILOT REPORTED NO MECHANICAL MALFUNCTION OR FAILURE WITH THE HELICOPTER DURING THE ACCIDENT FLIGHT.
NTSB Probable Cause
THE PILOT'S FAILURE TO MAINTAIN MAIN ROTOR RPM, WHICH RESULTED IN AN IN FLIGHT LOSS OF CONTROL AND COLLISION WITH TERRAIN.
Full Narrative
THE AG PILOT REPORTED THAT WHILE PERFORMING A MANEUVER (TURN TO REVERSE DIRECTION), HE ALLOWED THE MAIN ROTOR RPM TO DECAY. HE LOST CONTROL OF THE HELICOPTER, AND IT BOUNCED INTO A FIELD. THE AIRCRAFT BECAME AIRBORNE AGAIN, AND THE RPM DECAYED ONCE MORE. THE HELICOPTER THEN CRASHED INTO THE FIELD, AND THE TAIL BOOM WAS SEVERED BY THE MAIN ROTOR BLADES DURING IMPACT. THE PILOT REPORTED NO MECHANICAL MALFUNCTION OR FAILURE WITH THE HELICOPTER DURING THE ACCIDENT FLIGHT.
Flight
Event TypeAccident
Event Time16:15 CDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 47G-3B-1
Tail NumberN31FG
Aircraft CategoryHeli
DamageSubstantial
OperatorSpeth Stephen F
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · TVO-435-B1A · Reciprocating · 270
Seats1
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 45 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind90° @ 4 kt
Visibility7 sm
CeilingBroken clouds 20000 ft
Temperature / Dew Point52 / 50
Altimeter30.00 inHg
Observation Time20:50
Weather SourceWFAC