Accident caused by the crew "initiating and continuing a descent in IMC below the authorized altitude without visual contact with the runway environment."
Learjet conducted an “unexpected maneuver,” continuing a left-hand turn with an “excessive bank angle despite the loss of visual contact" with the fighter.
NTSB says pilots of the Cessna 172 and Sabreliner that collided near San Diego Brown Field Municipal Airport on August 16 were in contact with the tower.
Airplane hit a near-vertical rock face in a nose-high, wings-level attitude at an elevation of 1,600 feet msl and came to rest upright on steep terrain.