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NTSB Report
December 29, 1992 · Beech B90 · N31SV
Sioux Falls, SD
Overview
Report Status
Probable Cause
Event Type
Incident
Date
December 29, 1992
Injury Outcomes
No injuries (3 uninjured)
Location
Sioux Falls, SD
Aircraft
Beech B90
Tail Number
N31SV
Operator
Sioux Valley Hospital Assn
Injuries
None
Aircraft Damage
Minor
NTSB Number
CHI93IA060
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.
NTSB Probable Cause
THE PILOT-IN-COMMAND'S INADEQUATE PREFLIGHT.
Full Narrative
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.
Flight
Event TypeIncident
Event Time03:50 CST
Nearest Airport0nm N
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBeech B90
Tail NumberN31SV
Aircraft CategoryAir
DamageMinor
OperatorSioux Valley Hospital Assn
Operating RulePart 91
Engines2
Engine TypeTurboprop
Engine DetailsP&W · PT6-20 · Turboprop · 550
Seats7
People & Injuries
Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 34 · First Class
Conditions
ConditionsIMC
LightDark Night
Wind360° @ 12 kt
Visibility1 sm
CeilingOvercast 1000 ft
Temperature / Dew Point1 C / 0 C
Altimeter30.00 inHg
Observation Time09:50
Weather SourceWFAC