Event Details

Title:Crash after takeoff, United Air Lines, Inc., Boeing 737-222, N9005U, Philadelphia International Airport, Philadelphia, Pennsylvania, July 19, 1970
Micro summary:This Boeing 737 crashed shortly after takeoff, with no fatalities.
Event Time:1970-07-19 at 1907 EDT
File Name:1970-07-19-US.pdf
Publishing Agency:National Transportation Safety Board (NTSB)
Publishing Country:USA
Report number:NTSB-AAR-72-9
Site of event:Takeoff from Runway 9
Departure:Philadelphia International Airport, Philadelphia, Pensylvania, USA
Destination:Greater Rochester International Airport, Rochester, New York, USA
Airplane Type(s):Boeing 737-222
Flight Phase:Takeoff
Operator(s):United Airlines
Type of flight:Revenue
Serious Injuries:19
Other Injuries:0
Executive Summary:At approximately 1907 EDT, on July 19, 1970, United Air Lines, Flight 611, a Boeing 737-222, N9005U crashed shortly after taking off from the Philadelphia International Airport, Philadelphia, Pennsylvania. There were no fatalities. Among 55 passengers and six crewmembers, 17 passengers were injured, one seriously, and one crewmember received minor injuries.

Flight 611 made its takeoff from Runway 9. The takeoff roll and lift-off were reported normal in every respect. At the point in the climb where the landing gear is normally retracted, the flightcrew heard a loud explosion, following which the aircraft veered right. The captain stated, "I advanced power on both engines without any response and then made the decision to attempt to land on the remaining runway." The aircraft touched down hard on the departure runway and continued off the end and across the blast pad. The aircraft came to rest, 1,634 feet past the end of the runway, on a magnetic heading of 70.

No. 1 engine failed in flight. Disassembly of the engine revealed a contained failure within the turbine area. A fust-stage turbine blade failed in flight which caused cessation of engine rotation prior to ground contact.

Disassembly of the right (No. 2) engine and functional testing of its components revealed that it was in an operable condition at the time of the accident. All the evidence developed during the investigation demonstrated that the engine was operating in the air, during the thrust reversing cycle, and until the engine impacted the ground.

The National Transportation Safety Board. determines that the probable cause of this accident was the termination of the takeoff, after the No. 1 engine failed, at a speed above V2 at a height of approximately 50 feet, with insufficient runway remaining to effect a safe landing. The captain's decision and his action to terminate the takeoff were based on the erroneous judgment that both engines had failed.
Learning Keywords:Operations - Bang, pop, crack, sizzle!
Operations - Rejected Takeoff after V1
Systems - Engine - Contained Engine Failure
Consequence - Hull Loss


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