NTSB Identification: LAX07LA186.
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Accident occurred Monday, June 04, 2007 in Upland, CA
Probable Cause Approval Date: 09/26/2008
Aircraft: Piper PA-34-200, registration: N4463T
Injuries: 1 Serious,2 Minor.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
A Certified Flight Instructor (CFI) was providing multiengine instruction to the pilot. They were in the traffic pattern, approximately 800 feet above ground level (agl), after completing several touch-and-go landings. The CFI stated that his regular method for setting up practice engine-out landings for a student was to close the mixture, allow the student to go through the process of controlling the airplane, and simulating the procedures to feather the inoperative engine's propeller. The instructor would then return the mixture to full rich, and verify engine operation. This would occur on downwind, and then the landing would be completed with the simulated inoperative engine at idle. On downwind, the instructor closed the mixture on the left engine. During this maneuver, the pilot turned the airplane left from base to final and the airspeed decreased. The airplane rolled sharply to the left and lost altitude. The instructor reduced both throttles and regained control of the airplane just as it collided with the roof of one house, bounced across another roof, and came to rest on top of a third house. The Federal Aviation Administration recommends that in-flight simulated engine failures at altitudes below 3,000 feet agl be introduced only by reduction of the throttle. Post-crash inspection of the engine and airframe found no anomalies that would have prevented normal operation.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: Failure of the pilot under instruction to maintain the minimum single engine control airspeed (air) and directional control while turning to final approach. Also causal was the flight instructor's inadequate supervision and delayed remedial actions. Full narrative available
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