On Monday, June 28, 1965, Clipper Friendship,[2] the Boeing 707-321B operating this route, experienced an uncontained engine failure shortly after take-off, but was successfully able to make an emergency landing at nearby Travis Air Force Base.

Flight 843, carrying 143 passengers and 10 crew members, departed from San Francisco International Airport around 2:00 pm PST (18:00 UTC).

Improper positioning of the turbine rotor, use of the wrong type of tool, and worn parts included in the engine assembly process were blamed for that loss of clearance.

[3] The Civil Aeronautics Board (CAB) accident report states that the inspector on duty during the reinstallation of the turbine rotor "signed off on work he had not inspected".

Slashing through a wooden beam, the jet engine then penetrated an 8-inch (20 cm) thick concrete wall, damaging equipment outside, and came to rest on a mound of soil.

A 6-foot (1.8 m) section of the wing hit the ground in Holy Cross Cemetery and a charred chunk of the engine exhaust struck the rear of a housing area, also in South San Francisco.