Accident description
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| Status: | Final |
| Date: | 21 MAR 1968 |
| Time: | 03:53 CST |
| Type: | Boeing 727-22C |
| Operator: | United Air Lines |
| Registration: | N7425U |
| C/n / msn: | 19200/416 |
| First flight: | 1967-05-25 (10 months) |
| Total airframe hrs: | 2208 |
| Engines: | 3 Pratt & Whitney JT8D-1 |
| Crew: | Fatalities: 0 / Occupants: 3 |
| Passengers: | Fatalities: 0 / Occupants: 0 |
| Total: | Fatalities: 0 / Occupants: 3 |
| Airplane damage: | Written off |
| Airplane fate: | Written off (damaged beyond repair) |
| Location: | Chicago-O'Hare International Airport, IL (ORD) (United States of America)
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| Phase: | Takeoff (TOF) |
| Nature: | Cargo |
| Departure airport: | Chicago-O'Hare International Airport, IL (ORD/KORD), United States of America |
| San Francisco International Airport, CA (SFO/KSFO), United States of America | |
| Flightnumber: | 9963 |
The takeoff warning horn sounded shortly after commencing takeoff from runway 09R. The takeoff was continued as the crew tried to figure out what caused the warning. The horn ceased prior to reaching rotate speed. The stickshaker came on and thrust was added, but the aircraft failed to climb and the captain elected to discontinue the takeoff. The 727 settled back to the macadam shoulder off the right side of the runway and struck a ditch, coming to rest 1100 feet beyond the runway end and 300 feet right of the extended centreline. The flaps had been set at 2deg instead of takeoff range of 5-25 degrees.
PROBABLE CAUSE: "The failure of the crew to abort the takeoff after being warned of an unsafe takeoff condition." Follow-up / safety actions:
Following a recommendation by the NTSB, the FAA reviewed the procedures prescribed in U.S. air carrier's manuals to ensure that takeoffs will be aborted whenever the takeoff warning horn sounds prior to reaching V1, unless there are other overriding factors.
Sources:
Official accident investigation report
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Statistics
8th loss of a Boeing 727
8th worst accident involving a Boeing 727 (at the time)
57th worst accident involving a Boeing 727 (currently)
472nd worst accident in United States of America (at the time)
1096th worst accident in United States of America (currently) » figures explained
8th worst accident involving a Boeing 727 (at the time)
57th worst accident involving a Boeing 727 (currently)
472nd worst accident in United States of America (at the time)
1096th worst accident in United States of America (currently) » figures explained
Map
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 Chicago-O'Hare International Airport, IL (ORD/KORD) to San Francisco International Airport, CA (SFO/KSFO) as the crow flies is 2963 km (1852 miles).
Distance from Chicago-O'Hare International Airport, IL (ORD/KORD) to San Francisco International Airport, CA (SFO/KSFO) as the crow flies is 2963 km (1852 miles).
