Indonesian crashed plane's autothrottles show anomaly: committee
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E-mail Xinhua, February 10, 2021
JAKARTA, Feb. 10 (Xinhua) -- Indonesia's National Transportation Safety Committee said on Wednesday in a preliminary investigation report on the Jan. 9 crash of the Sriwijaya Air plane that the plane's autothrottles showed an anomaly for both left and right levers.
"The left autothrottle moved backward too far, while the right one did not move. It seemed like being stuck, but we are not sure which part is wrong," committee chairman Soerjanto Tjahjono said.
The preliminary report was based on information from the retrieved flight data recorder (FDR) and the cockpit voice recorder (CVR) is yet to be recovered.
In this investigation, the committee also noted that there were two damages to the equipment, which had been repaired, involving the right airspeed indicator and a malfunctioning autothrottle.
"After January 5, 2021, until the accident, there were no records of Deferred Maintenance Items in the Aircraft Maintenance Logbook," said Tjahjono.
He explained that the Sriwijaya Air SJ 182 plane took off from Sukarno-Hatta Airport at 2:36 p.m. local time, and the FDR recorded an active autopilot system at an altitude of 1,980 feet (about 604 m).
The FDR recorded that the left throttle lever moved backward while the right one was motionless when the aircraft was at an altitude of 8,150 feet (about 2,484 m).
Interactions between the pilot and the air traffic control (ATC) personnel showed that at 2:39:47 p.m., at an altitude of 10,600 feet (about 3,231 m), the plane started turning left due to a throttle "anomaly" and the ATC asked the pilot to raise that plane to an altitude of 13,000 feet (about 3,962 m).
"The pilot answered at 2:39.47 p.m. This was the last communication from SJ 182," said Tjahjono.
The FDR recorded that the autothrottle was inactive and the Boeing 737-500 aircraft pitched down at 2:40:10 p. m. and 20 minutes later the black box stopped operating.
Based on information from the Meteorology, Climatology and Geophysics Agency, the SJ 182 flight path did not cross the significant cloud area at 2:38 p.m.
Aboard the flight heading from Jakarta to Pontianak in the West Kalimantan province were two pilots, four crew members, and 56 passengers. Enditem
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