The plane's flight data recorder has been found and read by investigators but a maritime search is going on for the cockpit voice recorder's memory unit that Tjahjono said would help explain any human factors behind the crash."If we only have the FDR, we do not know why the parameter changed, what was the reason," he said of the autothrottle."We need confirmation from the components that we sent to the US and UK and the CVR.
READ: 'We have to find all 62 people', says rescue commander involved in Sriwijaya Air recovery missionKNKT said last month it was investigating whether a problem with the autothrottle system contributed to the crash given an issue with it had been reported on a flight a few days earlier.It is acceptable for a plane to fly with an autothrottle system that is not working because pilots can control it manually instead.
Instead of shutting off the system, the FDR indicated the pilots tried to get the stuck throttle to function, the WSJ said. That could create significant differences in power between engines, making the jet harder to control. Tjahjono said the WSJ report was incorrect and more information would be provided in the KNKT's preliminary report.