United Airlines Flight 823

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United Airlines Flight 823
Summary
Date  July 9, 1964
Type  on board fire
Site  near Parrottsville, Tennessee, USA
Fatalities  39
Injuries  0
Aircraft
 Aircraft type  Vickers Viscount 745D
Operator  United Airlines
Tail number  N7405
Passengers  35
Crew  4
Survivors  0

United Airlines Flight 823 was a scheduled flight from Philadelphia International Airport, Philadelphia, Pennsylvania to Huntsville International Airport, Huntsville, Alabama with 39 on board. On July 9, 1964 at approximately 18:15 EST it crashed 2 miles northeast of Parrottsville, Tennessee after experiencing an uncontrollable fire on board, killing all 39. The fire of unknown origin initiated below the passenger floor and eventually involved the passenger cabin. One passenger attempted to abandon the aircraft through the No.4 escape window prior to impact but did not survive the free-fall. The ignition source was never determined, but it is thought the plane's battery overheated or something in a passenger's luggage caused the fire. According to NTSB investigators, lethal amounts of CO2 were present in the cockpit, explaining witnesses reports of the aircraft seen flying erratically. The fire eventually burned through the cockpit and it is likely the crew was unconscious by that time.