MARQUEZ, NM, USA
N9121S
BEECH 58
THE ACFT WAS FLOWN AT ALTITUDES UP TO 15000 FT IN AREAS OF FORECAST ICING. THE ACFT WAS NOT EQUIPPED WITH OXYGEN. THE ACFT WAS FLOWN ABOVE 14000 FT FOR ABOUT 20 MINUTES AFTER WHICH IT DESCENDED INTO ICING CONDITIONS. SHORTLY THEREAFTER, THE ACFT MADE A CLIMB UNDER ATC DIRECTIONS AND THEN RADAR SHOWED IT MAKING A RAPID DESCENT. THE PLT HAD TOLD THE CONTROLLER THAT THE ACFT HAD PICKED UP ABOUT 1/2 INCH OF RIME ICE. RADAR CONTACT WAS LOST SHORTLY AFTER A READOUT AT 10400 FT. FURTHER ATTEMPTS AT COMMUNICATIONS FAILED. LATER, THE ACFT WAS FOUND WHERE IT HAD CRASHED IN A STEEP, VERTICALLY BANKED DIVE AT A HIGH RATE OF SPEED. RIME ICE WAS FOUND IN THE SNOW NEXT TO THE ELEVATOR COUNTERWEIGHT. THE ELEVATOR TRIM WAS FOUND TRIMMED TO A NOSE-UP POSITION. THE ACFT WAS EQUIPPED WITH DEICING/ANTI-ICING EQUIPMENT & AN AUTOPILOT.
Source: NTSB Aviation Accident Database
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