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NTSB Report
September 10, 1991 · Bell 47G-3B-2 · N2618D
Chula Vista, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
September 10, 1991
Injury Outcomes
2 injuries (2 minor injuries)
Location
Chula Vista, CA
Aircraft
Bell 47G-3B-2
Tail Number
N2618D
Operator
K & L Helicopters
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
LAX91LA390
THE PILOT WAS CONDUCTING A MAINTENANCE TEST FLIGHT OVER LAND IN A HELICOPTER EQUIPPED WITH A FLOAT LANDING GEAR. HIS FIRST AUTOROTATION WAS TERMINATED WITH A POWER RECOVERY. DURING HIS SECOND AUTOROTATION THE ENGINE FAILED. THE PILOT MISJUDGED HIS AUTOROTATIVE LANDING FLARE AND THE HELICOPTER TOUCHED DOWN WITH A FORWARD GROUND SPEED AND TUMBLED ALONG ITS GROUND PATH.
NTSB Probable Cause
THE PILOT'S FAILURE TO MAINTAIN THE PROPER AIRSPEED AND MISJUDGING THE LANDING FLARE ALTITUDE. THE POWERPLANT FAILURE FOR AN UNDETERMINED REASON AND THE UNSUITABLE TERRAIN FOR THE FLOAT EQUIPPED HELICOPTER WERE FACTORS IN THE ACCIDENT.
Full Narrative
THE PILOT WAS CONDUCTING A MAINTENANCE TEST FLIGHT OVER LAND IN A HELICOPTER EQUIPPED WITH A FLOAT LANDING GEAR. HIS FIRST AUTOROTATION WAS TERMINATED WITH A POWER RECOVERY. DURING HIS SECOND AUTOROTATION THE ENGINE FAILED. THE PILOT MISJUDGED HIS AUTOROTATIVE LANDING FLARE AND THE HELICOPTER TOUCHED DOWN WITH A FORWARD GROUND SPEED AND TUMBLED ALONG ITS GROUND PATH.
Flight
Event TypeAccident
Event Time16:45 PDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 47G-3B-2
Tail NumberN2618D
Aircraft CategoryHeli
DamageSubstantial
OperatorK & L Helicopters
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20 · Turboshaft · 318
Seats3
People & Injuries
Injury Summary2 injuries (2 minor injuries)
Fatal0
Serious0
Minor2
Uninjured0
Total2
Crew 1Age 40 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind290° @ 7 kt
Visibility25 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter29.00 inHg
Observation Time23:46
Weather SourceWFAC