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NTSB Report
August 19, 2006 · Bell 407 · N407SH
Havre, MT
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
August 19, 2006
Injury Outcomes
No injuries (1 uninjured)
Location
Havre, MT
Aircraft
Bell 407
Tail Number
N407SH
Operator
Silver State Helicopters
Injuries
None
Aircraft Damage
Substantial
NTSB Number
SEA06CA165
The pilot, who was approaching an area where he was going to place a long-line load onto the terrain, inadvertently allowed the helicopter to enter into a vortex ring state (settling with power) condition, resulting in his inability to keep the helicopter from descending at a rate that resulted in it hitting the ground and bouncing back into the air. At the point in time when it contacted the ground with its skids, the helicopter's tail rotor impacted a portion of the rigging for the load that it had been hauling, which resulted in substantial damage to the tail rotor and the tail rotor drive shaft.
NTSB Probable Cause
The pilot inadvertently allowing the helicopter to enter into a vortex ring state (settling with power) condition while he was lowering a long-line load to the ground, resulting in the helicopter settling to the ground and its tail rotor impacting part of the rigging used to haul the load. Factors include the long-line load and its rigging sitting on the ground at the point where the helicopter settled to the terrain.
Full Narrative
The pilot, who was approaching an area where he was going to place a long-line load onto the terrain, inadvertently allowed the helicopter to enter into a vortex ring state (settling with power) condition, resulting in his inability to keep the helicopter from descending at a rate that resulted in it hitting the ground and bouncing back into the air. At the point in time when it contacted the ground with its skids, the helicopter's tail rotor impacted a portion of the rigging for the load that it had been hauling, which resulted in substantial damage to the tail rotor and the tail rotor drive shaft.
Flight
Event TypeAccident
Event Time11:55 MDT
Nearest Airport0nm
Flight Plan FiledNone
Aircraft FireNo
Aircraft
AircraftBell 407
Tail NumberN407SH
Aircraft CategoryHeli
DamageSubstantial
OperatorSilver State Helicopters
Operating RulePart 133
Engines1
Engine TypeTurboshaft
Engine DetailsRolls-Royce · 250 C47B · Turboshaft
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 40 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
CeilingNone
Temperature / Dew Point0 C
Altimeter0