Report: Failure to fix throttle led to Indonesia plane crash, that killed 62

National Transportation Safety Committee investigators said in their final report that the Sriwijaya Air jet's maintenance record showed the problem with the automatic throttle had been reported by pilots 65 times since 2013 and was still unsolved when the 26-year-old plane plunged into the Java Sea after taking off from Jakarta on Jan. 9, 2021.

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. The report said that the movement of the automatic throttle is linked to 13 other components of the plane.Many of the problems leading to the crash were disclosed in a preliminary report issued by Indonesian authorities last year. The final report released Thursday provided new details of the pilots' response to them.

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.

Source: The AI Report (theaireport.net)

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