SIOUX FALLS, SD, USA
N31SV
BEECH B90
THE NIGHT POSITIONING FLIGHT WAS IN CRUISE FLIGHT AT 14,000 FEET WHEN THE MAIN CABIN DOOR SEPARATED FROM THE AIRPLANE. AN EXAMINATION OF THE DOOR REVEALED THAT THE DOOR LATCH MECHANISM WAS CAPABLE OF PROPER OPERATION WHEN SECURED PROPERLY. AN EXAMINATION OF THE ANNUNCIATOR DOOR WARNING LIGHT SYSTEM REVEALED THAT WHEN THE DIMMING RHEOSTAT WAS FULL DIM, THE 'DOOR OPEN' LIGHT WENT OUT. ONE OF THE TWO BULBS WAS BURNT OUT.
THE PILOT-IN-COMMAND'S INADEQUATE PREFLIGHT.
Source: NTSB Aviation Accident Database
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