NTSB Identification: CHI93IA060.
The docket is stored on NTSB microfiche number 47642.
Incident occurred Tuesday, December 29, 1992 in SIOUX FALLS, SD
Probable Cause Approval Date: 09/28/1993
Aircraft: BEECH B90, registration: N31SV
Injuries: 3 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

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

THE PILOT-IN-COMMAND'S INADEQUATE PREFLIGHT.

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