What happened
During the takeoff roll on a 3,700-foot runway, an observer noted a visible change in the exhaust flame color of the number one engine from blue to yellow, alongside a noticeable shift in engine power. This was followed by the aircraft yaws to the left and the left wing dipping. Although the crew managed to regain directional control and proceed with the takeoff, the aircraft subsequently veered off the runway.
Skid marks were identified starting approximately 650 feet before the end of the runway and extending for about 1,360 feet until the aircraft struck an abandoned grocery store. Prior to the impact with the building, the left wing struck a utility pole and a privacy fence. This sequence of events caused a rupture in the left wing's main fuel tank, which ignited a fire.
Findings
Post-crash investigations were limited because fire damage to all engines prevented a thorough examination of the ignition and fuel systems. While the elevator was observed to be functioning freely during taxiing, the aircraft's excursion resulted in significant damage.
Toxicological analysis of the second pilot revealed the presence of Diphenhydramine in both the blood and urine. The concentration of this sedating antihistamine was approximately ten times the level expected from a dose twice the recommended over-the-counter maximum. Other prescription and nonprescription medications were also identified in the second pilot's system during the examination.