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Accident
Last updated: 16 October 2017
Status:Definitief
Datum:donderdag 21 maart 1968
Tijd:03:53
Type:Silhouette image of generic B721 model; specific model in this crash may look slightly different
Boeing 727-22C
Luchtvaartmaatschappij:United Airlines
Registratie: N7425U
Constructienummer: 19200/416
Bouwjaar: 1967-05-25 (10 months)
Aantal vlieguren:2208
Motoren: 3 Pratt & Whitney JT8D-1
Bemanning:slachtoffers: 0 / inzittenden: 3
Passagiers:slachtoffers: 0 / inzittenden: 0
Totaal:slachtoffers: 0 / inzittenden: 3
Schade: Afgeschreven
Gevolgen: Written off (damaged beyond repair)
Plaats:Chicago-O'Hare International Airport, IL (ORD) (   Verenigde Staten)
Fase: Start (TOF)
Soort vlucht:Vracht
Vliegveld van vertrek:Chicago-O'Hare International Airport, IL (ORD/KORD), Verenigde Staten
Vliegveld van aankomst:San Francisco International Airport, CA (SFO/KSFO), Verenigde Staten
Vluchtnummer:UA9963
Beschrijving:
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:

PROBABLE CAUSE: "The failure of the crew to abort the takeoff after being warned of an unsafe takeoff condition."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 285 days (10 months)
Accident number: NTSB/AAR-69-01
Download report: Final report


Veiligheidsmaatregelen
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.

NTSB issued 2 Safety Recommendations

Show all AD's and Safety Recommendations

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Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Chicago-O'Hare International Airport, IL en San Francisco International Airport, CA bedraagt 2943 km (1840 miles).

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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Boeing 727

  • 1832 built
  • 8e ongeval
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