Narrative:Gibbs Flite Center Cessna 172 aircraft (N7711G) had taken off from Montgomery Field at 08:16 PST and proceeded to Lindbergh Field were two practice ILS approaches to runway 09 were flown. At 09:00 the Cessna pilot was instructed to maintain VFR at or below 3500 feet, heading 70deg. PSA Flight 182 (a scheduled passenger flight from Sacramento to San Diego via Los Angeles), cleared for a runway 27 approach, was advised by the approach controller that there was traffic in front of them. The PSA crew reported the traffic in sight immediately thereafter and the PSA flight was instructed to maintain visual separation and contact Lindbergh tower. Lindbergh tower again warned the PSA flight crew of "traffic, twelve o'clock, one mile, a Cessna". The crew had lost track of the Cessna and radioed back: "think he's passing off to our right". The flight crew still weren't sure of the actual position of the Cessna.
At 09:01:28 a conflict alert warning began in the San Diego Approach Control facility, indicating a collision hazard between PSA182 and the Cessna. At 09:01:47 the approach controller warned the Cessna pilot of traffic in the vicinity. At the same moment both aircraft collided. Flight 182 was descending and overtaking the Cessna, which was climbing in a wings level attitude. The Cessna broke up immediately and exploded after colliding with the Boeing's right wing. The Boeing entered a shallow right descending turn and crashed into a residential area.
PROBABLE CAUSE: "The failure of the flightcrew of Flight 182 to comply with the provisions of a maintain-visual-separation clearance, including the requirement to inform the controller when visual contact was lost; and the air traffic control procedures in effect which authorized the controllers to use visual separation procedures in a terminal area environment when the capability was available to provide either lateral or vertical separation to either aircraft. Contributing to the accident were (1) the failure of the controller to advise Flight 182 of the direction of movement of the Cessna; (2) the failure of the pilot of
the Cessna to maintain his assigned heading; and (3) the improper resolution by the controller of the conflict alert."
Mid air collision
Loss of control
Official accident investigation report
|investigating agency: ||National Transport Safety Bureau (NTSB) - USA |
|report status: ||Final|
|report number: ||NTSB/AAR-79-05|
|duration of investigation:||206 days (6.9 months)|
|download report: ||
Pacific Southwest Airlines, Inc., Boeing 727-214, N533PS, an Gibbs Flight Center, Inc., Cessna 172, N7711G, San Diego, California, September 25, 1978.
Follow-up / safety actions
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 San Diego International Airport, CA as the crow flies is 175 km (109 miles).