KENT, WA, USA
N1092L
HUGHES 369D
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.
Source: NTSB Aviation Accident Database
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