Incident Overview
During a takeoff on a maintenance ferry flight, with a mechanic occupying the right seat, the aircraft would not accelerate above V1 and would not rotate even with full aft yoke input. The captain subsequently aborted the takeoff, and the aircraft came to a stop at the end of the runway with the right main landing gear on the overrun area.
Post-Event Actions
After the aircraft stopped, crewmembers extinguished two small fires that had developed in the main gear brakes.
Investigation Findings
A subsequent investigation did not reveal the reason why the aircraft would not accelerate. However, it was noted that both main brake assemblies had been subjected to extreme heat and rapid cooling. Additionally, all brake pucks were found to be worn thin.
Damage Assessment
The observed damage to the brake assemblies and pucks was consistent with two possible scenarios: taking off with the parking brake engaged, or inadvertent application of the toe brakes during the takeoff roll.