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NTSB Report
December 21, 1983 · Bell 47G · N4475
El Cajon, CA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
December 21, 1983
Injury Outcomes
No injuries (2 uninjured)
Location
El Cajon, CA
Aircraft
Bell 47G
Tail Number
N4475
Injuries
None
Aircraft Damage
Substantial
NTSB Number
LAX84LA108
DURING A DEMONSTRATION TO SHOW HIS STUDENT HOW TO AUTOROTATE FM A 2 FT HEIGHT AGL THE INSTRUCTOR REDUCED PWR AND INADVERTENTLY APPLIED FWD CYCLIC. THE FRONT PORTION OF THE SKIDS HIT THE GD FOLLOWED BY THE MAIN ROTOR BLADES. HELICOPTER THEN ROCKED BACKWARDS, THE REAR PORTION OF THE SKIDS IMPACTED THE GD AND THE MAIN ROTOR BLADES SLICED THROUGH THE TAILBOOM.
Full Narrative
DURING A DEMONSTRATION TO SHOW HIS STUDENT HOW TO AUTOROTATE FM A 2 FT HEIGHT AGL THE INSTRUCTOR REDUCED PWR AND INADVERTENTLY APPLIED FWD CYCLIC. THE FRONT PORTION OF THE SKIDS HIT THE GD FOLLOWED BY THE MAIN ROTOR BLADES. HELICOPTER THEN ROCKED BACKWARDS, THE REAR PORTION OF THE SKIDS IMPACTED THE GD AND THE MAIN ROTOR BLADES SLICED THROUGH THE TAILBOOM.
Flight
Event TypeAccident
Event Time13:25 PST
Nearest AirportGillespie Fld (0nm N)
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 47G
Tail NumberN4475
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsFranklin · 6V4-200-C32 · Reciprocating · 200
Seats3
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 28 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind220° @ 10 kt
Visibility25 sm
CeilingBroken clouds 4000 ft
Temperature / Dew Point61 F / 0 C
Altimeter30.00 inHg
Observation Time20:45
Weather SourceWFAC