What happened
The pilot reported that during the initial phase of the takeoff roll, the aircraft's tail lifted as expected. However, immediately following this rotation, the airplane began to veer sharply toward the right side of the runway. The pilot attempted to continue the takeoff by extending the flaps, but the aircraft remained below the necessary flying speed to achieve lift. Consequently, the airplane departed the paved surface of the runway.
The investigation
A postaccident inspection of the aircraft revealed a mechanical obstruction affecting the braking system. Specifically, the cable for the GPS antenna had become lodged within the mechanism of the right parking brake. This entanglement caused the right brake to remain partially engaged during the takeoff roll, contributing significantly to the uncontrolled veer off the runway.