What happened
On the morning of the accident, Flight PS182 was performing a scheduled service from Sacramento to San Diego, with a planned stop in Los Angeles. As the crew prepared for their arrival at San Diego-Lindally Field on runway 27, air traffic controllers notified them of a Cessna 172M, registration N7711G, operating under the Gibbs Flight Center. This smaller aircraft had recently departed the airport for a local training flight carrying an instructor and a student pilot.
At approximately 09:01, while flying at 2,600 feet roughly 3 nautical miles northeast of the San Diego airport, the two aircraft collided in mid-air. The impact caused both planes to lose control and descend rapidly toward the ground. The wreckage struck several residential buildings and the 805 highway in the area between City Heights and Altadena. The collision resulted in 137 fatalities among the occupants of both aircraft, along with seven fatalities on the ground. Additionally, nine individuals on the ground sustained serious injuries, and numerous homes were destroyed during the crash.
Findings
The investigation determined that the primary cause was the failure of the Flight 182 crew to adhere to visual separation instructions, specifically the duty to notify controllers if they lost sight of the other aircraft. The accident was further compounded by air traffic control procedures that allowed for visual separation in a terminal environment when vertical or lateral separation could have been provided. Key contributing factors included the controller's failure to communicate the direction of the Cessna's movement, the Cessna pilot's deviation from the assigned heading, and the improper handling of a conflict alert by the controller.