What happened
During the takeoff roll, shortly after reaching V1 speed, the aircraft experienced a reduction in power from the left engine. While the captain reported a loss of power, the first officer, who was acting as the pilot flying, indicated that the captain had intentionally reduced power to the left engine as part of a training maneuver. There had been no prior communication or preflight planning regarding the practice of emergency procedures during this flight.
Despite the power reduction, the aircraft type became airborne at approximately 3,500 feet along the runway. Following liftoff, the crew lost control of the plane, resulting in a crash to the left of the runway and a subsequent fire. The crew members managed to evacuate the wreckage and sustained minor injuries.
Findings
An investigation involving the engine manufacturer and FAA supervision included a teardown of the left engine. The analysis revealed that the engine was rotating and operational at the moment of impact. No mechanical failures or inflight fires were identified at the crash site. However, investigators noted that both airspeed indicator bugs were configured 9 to 11 knots below the required V1 speed specified on the takeoff and landing data (TOLD) card. The unannounced reduction of engine power by the captain during the takeoff roll was a critical factor in the loss of control.