Boeing considers software revision after Lion Air

PRESS RELEASE
Date: 12 December 2018
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Boeing considers software revision after Lion Air

12 December, 2018 - Following the Lion Air JT610, an industry sources has said that the company is considering software revision to the airplane’s anti-stall autotrim system. The aircraft, a Boeing 737 MAX with only 800 hours on the airframe, crashed into the Java Sea off Jakarta on 29 October, killing all 189 people aboard.

The Indonesian National Transportation Safety Committee later released a preliminary report showing that the crew experienced continuous stick shaker activation shortly after take off due to a faulty angle of attack sensor. As the 737 MAX has engines that are heavier and mounted farther forward, Boeing equipped them with an autotrim system called MCAS which is activated at high angles of attack and automatically applies nose-down trim as an anti-stall protection.

Although MCAS has not been implicated in the crash, but report indicates that it was active during the crash flight and the pilots continually trimmed manually against its nose-down trim input. A previous crew that encountered the same problem addressed it through the standard runaway trim procedure, which is to use the airplane’s two stabilizer trim cutout switches to disable electric pitch trim. All models of the 737 are still equipped with manual trim wheels.

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