United Airlines Flight 266 was a scheduled passenger flight from Los Angeles International Airport, California, to General Mitchell International Airport, Milwaukee, Wisconsin, via Stapleton International Airport, Denver, Colorado. On January 18, 1969, at approximately 18:21 PST, the Boeing 727 operating the flight crashed into Santa Monica Bay, Pacific Ocean, about 11.5 miles (18.5 km) west of Los Angeles International Airport, four minutes after takeoff, killing all 38 on board.
Aircraft and crew The Boeing 727-22C aircraft, registration N7434U, was almost new and had been delivered to United Airlines only four months earlier. It had less than 1,100 hours of operating time. The crew of Flight 266 was Captain Leonard Leverson, 49, a veteran pilot who had been with United Airlines for 22 years and had almost 13,700 flying hours to his credit. His first officer was Walter Schlemmer, 33, who had approximately 7,500 hours, the flight engineer was Keith Ostrander, 29, who had 634 hours. Between them the crew had more than 4,300 hours of flight time on the Boeing 727.
Accident
The aircraft had a nonfunctional #3 generator for several days leading up to the accident. Per standard procedure, the crew placed masking tape over the switches and warning lights for the generator. Approximately two minutes after takeoff, the crew reported a fire warning on engine #1 and shut it down. The crew radioed to departure control that they only had one functioning generator and needed to return to the airport, but it turned out to be their last communication, with subsequent attempts to contact Flight 266 proving unsuccessful. Shortly after engine #1 shut down, the #2 generator also ceased operating for reasons unknown. With the loss of all power to the lights and flight attitude instruments, flying at night in instrument conditions, the pilots quickly became spatially disoriented and unable to know which inputs to the flight controls were necessary to keep the plane flying normally. Consequently, the crew lost control of the aircraft and crashed into the ocean at a steep nose-down angle, killing everyone on board. Rescuers (at the time) speculated that an explosion occurred aboard the plane. Three and a half hours after the crash three bodies had been found in the ocean along with parts of fuselage and a United States mail bag carrying letters with that day's postmark. Hope was dim for survivors because the aircraft was configured for domestic flights and did not carry liferafts or lifejackets. A Coast Guard spokesman said it looked "very doubtful that there could be anybody alive."
Investigation The National Transportation Safety Board (NTSB) was unable to determine why the #2 generator had failed after it had become the plane's sole power source, nor why the "standby electrical system either was not activated or failed to function." Several witnesses saw Flight 266 take off and reported seeing sparks emanating from either engine #1 or the rear of the fuselage, while others claimed an engine was on fire. Salvage operations were conducted to recover the wreckage of the aircraft, but not much useful information was gleaned as the cockpit instruments were not recovered. The wreckage was in approximately 930 feet (280 m) of water and had been severely fragmented, however the relatively small area in which it was spread indicated an extremely steep, nose-down angle at impact. There was little in the way of identifiable human remains at the wreckage site, only two passengers were identified and only one intact body was found. The #2 and #3 engines suffered severe rotational damage from high RPM speeds at impact, but the #1 engine had almost no damage because it had been powered off. No evidence of any fire or heat damage was found on the engines, thus disproving the witnesses' claims. The small portion of the electrical system that was recovered did not provide any relevant information. The Cockpit Voice Recorder took nearly six weeks to locate and recover. NTSB investigators could not explain the sparking seen by witnesses on the ground and theorized that it might have been caused by debris being sucked into the engine, a transient compressor stall or an electrical system problem that led to the eventual power failure. They also were unable to explain the engine #1 fire warning in the absence of a fire, but this may have resulted from electrical system problems or a cracked duct that allowed hot engine air to trigger the temperature sensors. The sensors from the #1 and #2 engines were recovered and exhibited no signs of malfunction. Some tests indicated that it was indeed possible for the #2 generator to fail from an overload condition as a result of the operating load shifting to it following the #1 generator's shutdown, this was maintained as a possible cause of the failure. N7434U had recently been fitted with a generator control panel that had been passed around several different UAL aircraft because of several malfunctions. After being installed in N7434U the month prior to the ill-fated flight, generator #3 once again caused operating problems and was swapped with a different unit. Since that generator was subsequently tested and found to have no mechanical issues, the control panel was identified as the problem after it caused further malfunctions with the replacement generator. Busy operating schedules and limited aircraft availability meant repair work on N7434U was put on hold, the #3 generator was disabled. The NTSB investigators believed that the inoperative #3 generator probably was not responsible for the #2 generator's in-flight failure since it was assumed to be isolated from the rest of the electrical system. The flight control system would not have been affected by the loss of electrical power, since it relied on hydraulic and mechanical lines, so it was concluded that the loss of control was the result of the crew's inability to see in the dark cockpit. It was theorized that the non-activation of the backup electrical system might have been for one of several reasons:
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