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NTSB Report
November 25, 1989 · Bell 47G-3B1 · N1358X
Ewell, AL
Overview
Report Status
Probable Cause
Event Type
Accident
Date
November 25, 1989
Injury Outcomes
2 injuries (2 serious injuries)
Location
Ewell, AL
Aircraft
Bell 47G-3B1
Tail Number
N1358X
Injuries
Serious
Aircraft Damage
Substantial
NTSB Number
ATL90LA030
THE PRIVATE RATED PILOT HAD ATTEMPTED A PRACTICE 180 DEGREE AUTOROTATION. IT WAS ABORTED BY THE INSTRUCTOR BECAUSE OF IMPROPER LINE UP BY THE PILOT UNDER INSTRUCTION. A SECOND AUTOROTATION WAS ATTEMPTED BY THE INSTRUCTOR TO DEMONSTRATE CORRECT PROCEDURE. THE INSTRUCTOR REPORTED THAT THE ENGINE DID NOT RESPOND TO AN ATTEMPTED POWER RECOVERY. HE ADDED COLLECTIVE PITCH TO AVOID TREES AND REACHED AN OPEN FIELD WITH LOW ROTOR RPM. THE HELICOPTER IMPACTED HARD & WAS SUBSTANTIALLY DAMAGED. LATER EXAMINATION OF THE ENGINE DID NOT REVEAL ANY DISCREPANCIES WHICH ACCOUNTED FOR THE REPORTED LOSS OF POWER.
NTSB Probable Cause
THE LOSS OF ENGINE POWER, FOR UNDETERMINED REASONS, AT LOW ALTITUDE DURING A PRACTICE AUTOROTATION. CONTRIBUTING TO THE ACCIDENT WAS THE INSTRUCTOR'S FAILURE TO PROPERLY PLAN THE DEMONSTRATED AUTOROTATION SO AS TO PRECLUDE AN ACCIDENT, IN THE EVENT THAT POWER WAS NOT AVAILABLE.
Full Narrative
THE PRIVATE RATED PILOT HAD ATTEMPTED A PRACTICE 180 DEGREE AUTOROTATION. IT WAS ABORTED BY THE INSTRUCTOR BECAUSE OF IMPROPER LINE UP BY THE PILOT UNDER INSTRUCTION. A SECOND AUTOROTATION WAS ATTEMPTED BY THE INSTRUCTOR TO DEMONSTRATE CORRECT PROCEDURE. THE INSTRUCTOR REPORTED THAT THE ENGINE DID NOT RESPOND TO AN ATTEMPTED POWER RECOVERY. HE ADDED COLLECTIVE PITCH TO AVOID TREES AND REACHED AN OPEN FIELD WITH LOW ROTOR RPM. THE HELICOPTER IMPACTED HARD & WAS SUBSTANTIALLY DAMAGED. LATER EXAMINATION OF THE ENGINE DID NOT REVEAL ANY DISCREPANCIES WHICH ACCOUNTED FOR THE REPORTED LOSS OF POWER.
Flight
Event TypeAccident
Event Time11:00 CST
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireGrd
Aircraft ExplosionNo
Aircraft
AircraftBell 47G-3B1
Tail NumberN1358X
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · TVO-435-B1B · Reciprocating · 270
Seats2
People & Injuries
Injury Summary2 injuries (2 serious injuries)
Fatal0
Serious2
Minor0
Uninjured0
Total2
Crew 1Age 44 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind120° @ 7 kt
Visibility7 sm
CeilingBroken clouds 3000 ft
Temperature / Dew Point61 F / 50
Altimeter30.00 inHg
Observation Time17:22
Weather SourceWFAC