NTSB Identification: LAX96FA236.
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Accident occurred Wednesday, June 19, 1996 in LOS ANGELES, CA
Probable Cause Approval Date: 10/14/1997
Aircraft: Beech C23, registration: N66343
Injuries: 3 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

The pilot had flown an earlier flight in the accident airplane without incident. On the second takeoff the engine lost power. Examination of the airplane revealed the right magneto was malfunctioning and the electric fuel boost pump was inoperative. Maintenance was performed on both components the day before the accident during a 50-hour inspection by company maintenance personnel. The plane had accumulated about 4 flight hours since the inspection. The airplane manufacturer indicates in the pilot operating handbook that the fuel boost pump should be replaced at engine overhaul and the engine be overhauled every 2,000 hours. The airplane had accumulated a total time in service of 3,338 hours. The maintenance records note that a major overhaul was accomplished about 1,692 hours before the accident. There was no evidence of the fuel boost pump ever being replaced. The use of the fuel boost pump is specified in the airplane emergency procedures for engine failure.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

company maintenance personnel's inadequate service of the magneto system, and their failure of to replace the electric fuel boost pump, which led to a malfunctioning right magneto and an inoperative fuel boost pump. The inoperative fuel boost pump made it impossible for the pilot to accomplish the published emergency procedure for the engine failure.

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