Probable cause(s): The total loss of engine power caused by crankshaft failure, due to fatigue cracking of undetermined origin. January 28, 1991 KORL, Cessna 210L, N210GC, Injuries: 1 Fatal: The pilot reported a vacuum pump failure to his company operations and air traffic control by airplane radio. While being vectored for an ILS back-course approach in instrument conditions, the airplane collided with terrain. Probable cause(s): The pilot's failure to maintain aircraft control in instrument conditions and his spatial disorientation. Factors were a failure of the vacuum pump and the pilot's lack of recent experience in partial panel instrument flying or training. September 21, 1992 KORL, Cessna 210L, N2013S, Injuries: 1 Uninjured: Pilot stated that while attempting to extend the landing gear the gear hydraulic motor operated but the gear did not extend. After several seconds of gear motor operation the circuit breaker for the gear motor popped. Further attempts to extend the gear by normal and emergency procedures were unsuccessful. A gear up landing was made. After the accident the aircraft was raised and the landing gear was extended by use of the manual gear extension emergency hydraulic pump. According to maintenance personnel a wire to the nose landing gear squat switch was chafed and grounded which caused the system to be signaled for gear up at all times. They further stated the pilot could not extend the gear by use of the backup hydraulic pump because the gear down solenoid had overheated during attempts to lower the gear and froze in the gear up position. After the solenoid cooled after landing they were able to manually lower the gear. Probable cause(s): Undetected chafing and grounding of a wire to the nose landing gear squat switch which resulted in the landing gear being signaled at all times for gear up when electrical power was applied to the system. Contributing to the accident was the overheating of the gear down solenoid which caused it to stick in the gear up position and prevented the gear from being manually extended. September 21, 1992, KORL, Cessna 210L, N777BK, Injuries: 1 Uninjured: Flight was unable to get safe indication for landing gear extended while approaching destination airport. Flight returned to departure airport. After accomplishing emergency procedures for gear extension, gear safe indication was still not obtained. Pilot determined all hydraulic fluid had been lost. Flight was landed with the nose gear locked and the