The NTSB on Tuesday is scheduled to adopt its final investigation reports, including the determination of probable cause, of two fatal Learjet accidents–departure from controlled flight, Learjet 24B, N600XJ, Helendale, Calif., Dec. 23, 2003; and controlled flight into terrain, Learjet 35A, N30DK, San Diego, Calif., Oct. 24, 2004. According to the NTSB’s factual report, the crew of N600XJ declared an emergency and reported they were returning to their departure airport just before the twinjet descended from 24,000 feet and crashed in the Mojave Desert. The two pilots were killed. N30DK, on an air ambulance flight, crashed into Otay Mountain at 12:30 a.m., about two minutes after taking off from Brown Field near San Diego. The two pilots and three aeromedical staff were killed. The crew took off under VFR intending to pick up their IFR clearance in the air.