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NTSB Report
April 6, 2017 · Bell 206 B · N206SA
La Verne, CA
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
April 6, 2017
Injury Outcomes
No injuries (2 uninjured)
Location
La Verne, CA
Aircraft
Bell 206 B (1973)
Tail Number
N206SA
Operator
Havasu Heli Flights
Injuries
None
Aircraft Damage
Substantial
NTSB Number
GAA17CA218
The flight instructor in the helicopter reported that he was providing hovering autorotation training to a private pilot. The flight instructor reported that he rolled off the throttle to initiate the maneuver, and the private pilot "raised the collective too soon which resulted in the aircraft climbing." The rotor inertia decayed, and a main rotor blade struck the tailboom after the helicopter struck the ground. The helicopter sustained substantial damage to the tail rotor drive shaft. The pilot reported that there were no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation.
NTSB Probable Cause
The pilot’s early increased application of the collective during a simulated hovering autorotation, which resulted in a loss of rotor rpm and subsequent main rotor blade strike of the tailboom.
Full Narrative
The flight instructor in the helicopter reported that he was providing hovering autorotation training to a private pilot. The flight instructor reported that he rolled off the throttle to initiate the maneuver and the private pilot, "raised the collective too soon which resulted in the aircraft climbing." The rotor inertia decayed and a main rotor blade struck the tailboom after the helicopter struck the ground. The helicopter sustained substantial damage to the tail rotor drive shaft. The pilot reported that there were no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation.
Flight
Event TypeAccident
Event Time10:35 PDT
Nearest AirportBrackett Field (0nm E)
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 206 B
Tail NumberN206SA
Aircraft CategoryHeli
DamageSubstantial
OperatorHavasu Heli Flights
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsRolls Royce · 250-C20 · Turboshaft · 400
Seats5
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 58 · Second Class · None
Crew 2Age 48 · Second Class · None
Conditions
ConditionsVMC
LightDaylight
Wind250° @ 6 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point70 F / 48
Altimeter30.05 inHg
Observation Time17:47
Weather SourceWFAC