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NTSB Report
October 11, 1991 · Hughes 369D · CGKHR
Hyder, AK
Overview
Report Status
Probable Cause
Event Type
Accident
Date
October 11, 1991
Injury Outcomes
1 injury (1 serious injury)
Location
Hyder, AK
Aircraft
Hughes 369D
Tail Number
CGKHR
Operator
Vancouver Helicopters
Injuries
Serious
Aircraft Damage
Substantial
NTSB Number
SEA92LA011
THE HUGHES 369D WAS RETURNING TO A LOAD PICK UP POINT WHEN THE PILOT FELT AND HEARD A VIBRATION, WHICH SEEMED TO BE COMING FROM THE AREA OF THE TAIL ROTOR. THE PILOT ROLLED BACK THE POWER, AND BEGAN AN AUTOROTATION. AS HE INCREASED POWER AND COLLECTIVE, TO MANEUVER FOR THE FLARE, HE HEARD TWO LOUD BANGS COME FROM THE TAIL ROTOR AREA. THIS WAS FOLLOWED IMMEDIATELY BY AN UNCONTROLLED ROTATION OF THE AIRFRAME. HE ATTEMPTTED TO APPLY FULL UP COLLECTIVE JUST PRIOR TO IMPACT, BUT HIT THE TERRAIN WITH CONSIDERABLE FORCE.
NTSB Probable Cause
THE FAILURE OF THE TAIL ROTOR HUB ASSEMBLY. FACTORS INCLUDE UNSUITABLE TERRAIN, AND HIGH VEGETATION.
Full Narrative
THE HUGHES 369D WAS RETURNING TO A LOAD PICK UP POINT WHEN THE PILOT FELT AND HEARD A VIBRATION, WHICH SEEMED TO BE COMING FROM THE AREA OF THE TAIL ROTOR. THE PILOT ROLLED BACK THE POWER, AND BEGAN AN AUTOROTATION. AS HE INCREASED POWER AND COLLECTIVE, TO MANEUVER FOR THE FLARE, HE HEARD TWO LOUD BANGS COME FROM THE TAIL ROTOR AREA. THIS WAS FOLLOWED IMMEDIATELY BY AN UNCONTROLLED ROTATION OF THE AIRFRAME. HE ATTEMPTTED TO APPLY FULL UP COLLECTIVE JUST PRIOR TO IMPACT, BUT HIT THE TERRAIN WITH CONSIDERABLE FORCE.
Flight
Event TypeAccident
Event Time13:00 AKDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHughes 369D
Tail NumberCGKHR
Aircraft CategoryHeli
DamageSubstantial
OperatorVancouver Helicopters
Operating RulePart 133
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20B · Turboshaft · 375
Seats5
People & Injuries
Injury Summary1 injury (1 serious injury)
Fatal0
Serious1
Minor0
Uninjured0
Total1
Crew 1Age 44 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind45° @ 10 kt
Visibility8 sm
CeilingOvercast 3500 ft
Temperature / Dew Point39 C / 0 C
Altimeter0
Weather SourcePILO