Indonesian aviation investigators say a failure to properly repair a malfunctioning automatic throttle, pilots’ overreliance on the plane’s automation system, and inadequate training led to the crash of a Boeing 737-500 last year that killed 62 people.
The automatic throttle attempted to compensate by reducing the left engine’s power further, cutting its output to as low as 34%. The right engine’s power remained at its climb setting, or about 92%, resulting in sharply unequal thrust, the report said.
The automatic throttle can be used by pilots to set the speed automatically, thereby reducing their workload and wear on the engines. Movements of the automatic throttle are linked to 13 other components of the plane, the report said. Utomo said the voice data recorder only worked on one audio channel, and another channel that was supposed to record all voices in the cockpit was filled with an unknown buzzing sound that prevented investigators from fully analyzing the coordination between the two pilots.
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