Event Description
The pilot reported that during the first attempt to rotate, the stall warning horn activated. Noticing the rear engine in an overboost condition, the pilot fully retarded the throttle, then advanced it to below the red line. He continued the takeoff and attempted to rotate two more times before aborting. The pilot retarded the throttles and applied full braking, but the aircraft ran off the end of the runway and collided with a concrete irrigation ditch. The landing gear separated from the aircraft.
Investigation Findings
The investigation revealed that the aircraft was over the maximum gross weight by 311 pounds.
Pilot Experience
The pilot logged 11 hours total time and 1 hour in the last 90 days, all in the Cessna T337E.
Aircraft Operating Procedures
The owner's manual states that if an overboost occurs on takeoff, the throttle should be retarded slightly to below the red line. The engine manufacturer indicated that the red limit will be exceeded when the throttles are advanced fully forward, and that this condition is not detrimental to the engine.