In an accident flight, the cockpit voice recorder (CVR) usually records its final minutes. In the Partnair crash, however, it had recorded the start of the flight and stopped shortly before the aircraft took off. From the maintenance records investigators found that, 10 years prior to the accident flight, the cockpit voice recorder's power supply had been re-wired to connect to the aircraft's generator instead of the aircraft's battery if full power was applied for takeoff. As the generator was inoperative on this flight, power to the CVR shut off as the aircraft took off.