NTSB Identification: FTW84FA104.
The docket is stored on NTSB microfiche number 24524.
Accident occurred Tuesday, December 27, 1983 in MARQUEZ, NM
Aircraft: BEECH 58, registration: N9121S
Injuries: 4 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

FLIGHT INTO KNOWN ADVERSE WEATHER..PERFORMED..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

IN-FLIGHT PLANNING/DECISION..IMPROPER..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

WING..ICE


Contributing Factors

WEATHER CONDITION..ICING CONDITIONS

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