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Last updated: 24 March 2019
Date:Thursday 30 July 1992
Type:Silhouette image of generic L101 model; specific model in this crash may look slightly different
Lockheed L-1011 TriStar 1
Operator:Trans World Airlines - TWA
Registration: N11002
C/n / msn: 1014
First flight: 1972
Total airframe hrs:49662
Engines: 3 Rolls-Royce RB211-22B
Crew:Fatalities: 0 / Occupants: 12
Passengers:Fatalities: 0 / Occupants: 280
Total:Fatalities: 0 / Occupants: 292
Aircraft damage: Destroyed
Aircraft fate: Written off (damaged beyond repair)
Location:New York-John F. Kennedy International Airport, NY (JFK) (   United States of America)
Crash site elevation: 4 m (13 feet) amsl
Phase: Takeoff (TOF)
Nature:Domestic Scheduled Passenger
Departure airport:New York-John F. Kennedy International Airport, NY (JFK/KJFK), United States of America
Destination airport:San Francisco International Airport, CA (SFO/KSFO), United States of America
Flight 843 to San Francisco was cleared to push back from the gat at 17:16 and was cleared to taxi to runway 13R at 17:25. Takeoff was commenced at 17:40. The VR speed was reached at 17:41:03 and the aircraft lifted off the runway. At that moment the stick shaker activated and the first officer, who was making the takeoff, sensed a loss of performance. The captain than took over control and decided to abort the takeoff. The TriStar touched down again (at a vertical descent rate of 14 feet/sec - the structural design limit being 6 feet/sec -) after being airborne for about 6 seconds. Maximum braking and reverse thrust were applied but the airplane didn't decelerate as expected. When it became apparent that he would not be able to stop before hitting the blast fence at the end of the runway, the captain turned the plane left off the runway onto a field. The TriStar came to rest 296 feet to the left of the runway and caught fire.
It appeared that the right Angle of Attack (AOA) sensor had experienced 9 previous malfunctions. The intermittent malfunction was not detectable during pre-flight system tests by the pilots and didn't trigger a fault light. This permitted the sensor to cause a false warning when the air-ground sensor on the landing gear went into the air status on takeoff.

Probable Cause:

PROBABLE CAUSE: "Design deficiencies in the stall warning system that permitted a defect to go undetected, the failure of TWA's maintenance system and inadequate crew coordination between the captain and first officer that resulted in their inappropriate response to a false stall warning."

Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 244 days (8 months)
Accident number: NTSB/AAR-93-04
Download report: Final report


Runway excursion

» FSAT 94-08
» ICAO Adrep Summary 1/95
» NTSB/AAR-93/04

Follow-up / safety actions

NTSB issued 10 Safety Recommendations

Show all...


photo of Lockheed L-1011 TriStar 1 N11002
photo of Lockheed L-1011 TriStar 1 N11002
photo of Lockheed L-1011 TriStar 1 N11002
photo of Lockheed L-1011 TriStar 1 N11002
photo of Lockheed L-1011 TriStar 1 N11002
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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 New York-John F. Kennedy International Airport, NY to San Francisco International Airport, CA as the crow flies is 4123 km (2577 miles).
Accident location: Exact; as reported in the official accident report.

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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