ASN Aircraft accident Vickers 745D Viscount N7405 Parrottsville, TN
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Status:Accident investigation report completed and information captured
Date:Thursday 9 July 1964
Type:Silhouette image of generic VISC model; specific model in this crash may look slightly different
Vickers 745D Viscount
Operator:United Airlines
Registration: N7405
MSN: 103
First flight: 1955
Total airframe hrs:23804
Engines: 4 Rolls-Royce Dart 510
Crew:Fatalities: 4 / Occupants: 4
Passengers:Fatalities: 35 / Occupants: 35
Total:Fatalities: 39 / Occupants: 39
Aircraft damage: Destroyed
Aircraft fate: Written off (damaged beyond repair)
Location:3,6 km (2.3 mls) NE of Parrottsville, TN (   United States of America)
Phase: En route (ENR)
Nature:Domestic Scheduled Passenger
Departure airport:Washington-National Airport, DC (DCA/KDCA), United States of America
Destination airport:Knoxville-McGhee Tyson Airport, TN (TYS/KTYS), United States of America
A United Air Lines Vickers Viscount 745D, N7405, Flight 823, crashed near Parrottsville, Tennessee. Thirty-five passengers and the four crewmembers died in the crash.
Flight 823 was a regularly scheduled operation from Philadelphia, PA, to Huntsville, AL, with en route stops at Washington, D.C., and Knoxville, TN. The flight operated without any reported discrepancies or difficulties. Flight 823 departed Washington-National Airport, DC (DCA), at 16:36 with an estimated arrival time of 18:13 at Knoxville-McGhee Tyson Airport, TN (TYS).
The flight proceeded on an IFR flight plan at FL140 to the Holston Mountain V0R. The crew reported to the Atlanta ARTCC over that fix at 17:58:35 and estimated their arrival at Knoxville at 18:21.
Approximately one minute after having reported passing Holston Mountain, the crew requested a clearance to descend to the lowest available altitude. They were cleared to descend to and maintain 8,000 feet. Three minutes later the crew cancelled their IFR clearance.
The controller offered to pass control of the flight to Knoxville Approach Control when they were closer in and advised they could stay on the Center frequency. At 1802:55 the crew responded to this transmission with "OK." This was the last known transmission from the aircraft.
It is believed that the crew discovered a fire sometime during the period between cancelling their IFR and before being observed in a descent about 4,000 feet above the ground. The aircraft deviated to the south of Airway V16 but was proceeding in a descent approximately parallel to the airway. At approximately 18:10, the aircraft was observed about 500 feet above the ground, trailing smoke. The aircraft continued to operate at very low altitudes and well to the left of the airway from this point on to the crash.
At a point approximately 3 km before the impact site, a passenger opened the left hand overwing exit and exited the plane. He fell straight down and did not survived the jump.
The aircraft was then observed going into a nose-high attitude, the left wing and the nose went down, and the aircraft dived into the ground, exploded, and burned.

Probable Cause:

PROBABLE CAUSE: "An uncontrollable in-flight fire of undetermined origin, in the fuselage, which resulted in a loss of control of the aircraft."

Accident investigation:

Investigating agency: CAB
Status: Investigation completed
Accident number: final report
Download report: Final report


Loss of control

» ICAO Aircraft Accident Digest No.16 - Volume III, Circular 82-AN/69 (38-49)


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This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Washington-National Airport, DC to Knoxville-McGhee Tyson Airport, TN as the crow flies is 697 km (436 miles).
Accident location: Approximate; accuracy within a few kilometers.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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Vickers Viscount

  • 445 built
  • 52nd loss
  • 30th fatal accident
  • 6th worst accident (at the time)
  • 17th worst accident (currently)
» safety profile

 United States of America
  • 41st worst accident (at the time)
  • 85th worst accident (currently)
» safety profile

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