Accident
Last updated: 23 October 2014
Status:Schlussbericht
Datum:Samstag 18 Januar 1969
Zeit:18:21
Flugzeugtyp:Boeing 727-22C
Fluggesellschaft:United Air Lines
Kennzeichen: N7434U
Werknummer: 19891/631
Baujahr: 1968-09-04 (5 months)
Betriebsstunden:1036
Triebwerk: 3 Pratt & Whitney JT8D-7
Besatzung:Todesopfer: 6 / Insassen: 6
Fluggäste:Todesopfer: 32 / Insassen: 32
Gesamt:Todesopfer: 38 / Insassen: 38
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:20 km (12.5 Meilen) W vom Land entfernt von Los Angeles, CA (   USA) show on map
Flugphase: Während des Fluges (ENR)
Betriebsart:Inländischer planmäßiger Passagierflug
Flug von:Los Angeles International Airport, CA (LAX/KLAX), USA
Flug nach:Denver-Stapleton International Airport, CO (DEN/KDEN), USA
Flugnummer: 266
Unfallbericht:
Boeing 727-22C N7434U operated Flight 266 from Los Angeles to Denver, CO and Milwaukee, WI. The aircraft had been operating since January 15, 1969, with the No. 3 generator inoperative. This was allowed because according to the Minimum Equipment List, the aircraft is airworthy with only two generators operable provided certain procedures are followed and electrical loads are monitored during flight.
Flight 266 was scheduled to depart the gate at 17:55, but was delayed until 18:07 because of the inclement weather and loading problems. The flight commenced its takeoff roll on runway 24 at approximately 18:17. At 18:18:30 the sound of an engine fire warning bell was heard in the cockpit. The crew reported a no. 1 engine fire warning and stated that they wanted to return to the airport. Shortly after shutdown of the No. 1 engine, electrical power from the remaining generator (No. 2) was lost. Following loss of all generator power, the standby electrical system either was not activated or failed to function. Electrical power at a voltage level of approximately 50 volts was restored approximately a minute and a half after loss of
the No. 2 generator. The duration of this power restoration was just 9 to 15 seconds. The Boeing descended and struck the sea 11.3 miles west of the airport. The ocean depth at this point is approximately 950 feet.


PROBABLE CAUSE: "The loss of attitude orientation during a night, instrument departure in which all attitude instruments were disabled by loss of electrical power. The Board has been unable to determine (a) why all generator power was lost or (b) why the standby electrical power system either was not activated or failed to function."

Informationsquelle:

Official accident investigation report
investigating agency: National Transport Safety Bureau (NTSB) - United States of America
report status: Final
report number: NTSB/AAR-70-06
report released:18-MAR-1970
duration of investigation:424 days (1 year 2 months)
download report: United Air Lines, Inc., Boeing 727-22C, N7434U, near Los Angeles, California, January 18, 1969. (NTSB/AAR-70-06)
cover

Sicherheitsempfehlungen

FAA issued 4 Airworthiness Directives
NTSB issued 2 Safety Recommendations

Show all AD's and Safety Recommendations

Fotos

Add your photo of this accident or aircraft

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 Los Angeles International Airport, CA to Denver-Stapleton International Airport, CO as the crow flies is 1356 km (848 miles).

languages: English Français Nederlands Deutsch Espanol

Share
Share

Boeing 727

  • 10th loss
  • 1832 built
  • 6th worst accident (Zu diesem Zeitpunkt)
  • 39th worst accident (Momentan)
safety profile

 USA
  • 54th worst accident (Zu diesem Zeitpunkt)
  • 89th worst accident (Momentan)
»safety profile