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NTSB Report
April 14, 1984 · Hughes 369D · N1092L
Kent, WA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
April 14, 1984
Injury Outcomes
1 injury (1 minor injury)
Location
Kent, WA
Aircraft
Hughes 369D
Tail Number
N1092L
Operator
Akminco Mining
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
SEA84LA083
THE PLT REQUESTED CLEARANCE TO TRANSIT THE SEATTLE TCA FOR A LANDING AT BOEING FIELD. HE WAS ADVISED OF A DC-10 DEPARTING THE SEATTLE-TACOMA INTL ARPT & WAS CAUTIONED ABOUT POSSIBLE WAKE TURBULENCE. THE DC-10 PASSED THE HELICOPTER WITH ABOUT 1 1/2 MI LATERAL SEPARATION & WAS ABOUT 600 FT HIGHER THAN THE HELICOPTER. SHORTLY AFTER THAT, THE HELICOPTER ENCOUNTERED VIOLENT VORTEX TURBULENCE. IT EXCEEDED 90 DEG OF BANK & 90 DEG OF NOSE DOWN ATTITUDE, AT WHICH TIME, THE ENG FLAMED OUT. THE TURBULENCE CONTINUED THRU-OUT THE ENSUING AUTOROTATION, BUT DIMINISHED DURING THE LAST 100 TO 200 FT. THE PLT TRIED TO FLARE FOR A LANDING, BUT THE MAIN ROTOR BLADES FLEXED DOWNWIND & CONTACTED THE TAIL BOOM. DURING RECOVERY, LESS THAN 1 QT OF FUEL WAS FOUND IN THE HELICOPTER.
Full Narrative
THE PLT REQUESTED CLEARANCE TO TRANSIT THE SEATTLE TCA FOR A LANDING AT BOEING FIELD. HE WAS ADVISED OF A DC-10 DEPARTING THE SEATTLE-TACOMA INTL ARPT & WAS CAUTIONED ABOUT POSSIBLE WAKE TURBULENCE. THE DC-10 PASSED THE HELICOPTER WITH ABOUT 1 1/2 MI LATERAL SEPARATION & WAS ABOUT 600 FT HIGHER THAN THE HELICOPTER. SHORTLY AFTER THAT, THE HELICOPTER ENCOUNTERED VIOLENT VORTEX TURBULENCE. IT EXCEEDED 90 DEG OF BANK & 90 DEG OF NOSE DOWN ATTITUDE, AT WHICH TIME, THE ENG FLAMED OUT. THE TURBULENCE CONTINUED THRU-OUT THE ENSUING AUTOROTATION, BUT DIMINISHED DURING THE LAST 100 TO 200 FT. THE PLT TRIED TO FLARE FOR A LANDING, BUT THE MAIN ROTOR BLADES FLEXED DOWNWIND & CONTACTED THE TAIL BOOM. DURING RECOVERY, LESS THAN 1 QT OF FUEL WAS FOUND IN THE HELICOPTER.
Flight
Event TypeAccident
Event Time10:10 PST
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHughes 369D
Tail NumberN1092L
Aircraft CategoryHeli
DamageSubstantial
OperatorAkminco Mining
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20B · Turboshaft · 420
Seats4
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 42 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind170° @ 4 kt
Visibility70 sm
CeilingBroken clouds 20000 ft
Temperature / Dew Point61 F / 46
Altimeter30.00 inHg
Observation Time16:56
Weather SourceWFAC