NTSB Identification: LAX04LA124.
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Accident occurred Friday, February 13, 2004 in Upland, CA
Probable Cause Approval Date: 04/28/2005
Aircraft: Cessna 172N, registration: N5107K
Injuries: 2 Minor,1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The engine lost partial power just after the airplane lifted off the runway and the pilot aborted the takeoff and attempted to land on the remaining runway. The airplane touched down on the runway, overran its departure end, impacted a flatbed trailer, and came to rest on uneven terrain against a berm about 43 yards from the runway. The pilot reported that the airplane appeared to have been in proper working condition and worthy of flight during his preflight and pretakeoff inspections. However, after climbing for several seconds he heard the engine lose power, and its tachometer decreased to 1,400 rpm. The pilot believed that the airplane was not going to continue flying so he elected to abort the takeoff. To ascertain the reason for the power loss, the accident airplane's engine was removed from the airplane and installed on another airframe. After removing and replacing several impact-damaged engine accessories/components, the engine was run up to 2,400 rpm. With the exception of a minor vibration due to the fact that the crankshaft was bent, the engine operated normally. The reason for the partial engine power loss, as reported by the pilot, was not ascertained.

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

A partial loss of engine power for undetermined reasons during takeoff.

Full narrative available

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