Sat, Oct 26, 2019 - Page 6 News List

Indonesia suggests 737 MAX revisions

‘DEFICIENCIES’:The report identified several mechanical and design issues, as well as a lack of documentation, that contributed to the crash of a Lion Air jet last year


Indonesia has recommended closer scrutiny of automated control systems, better design of flight deck alerts and accounting for a more diverse pilot population in the wake of a Boeing 737 MAX crash, according to a copy of a final report seen by reporters.

The report into the crash of the Lion Air jet on Oct. 29 last year that killed all 189 people on board was to be publicly released late yesterday.

Less than five months after the Lion Air accident, an Ethiopian Airlines 737 MAX crashed, leading to a global grounding of the model and sparking a corporate crisis at Boeing, the world’s biggest planemaker.

Indonesian investigators on Wednesday told families of the victims that a number of factors contributed to the crash, including mechanical and design issues and a lack of documentation about how systems would behave.

“Deficiencies” in the flight crew’s communication and manual control of the aircraft contributed to the crash, as did alerts and distractions in the cockpit, according to slides presented to the families.

The final report said that the first officer was unfamiliar with procedures and had shown issues handling the aircraft during training.

The report also found that a critical sensor providing data to an anti-stall system had been miscalibrated by a repair shop in Florida and that there were strong indications that it was not tested during installation by Lion Air maintenance staff.

Lion Air should have grounded the jet following faults on earlier flights, the report said, adding that 31 pages were missing from the airline’s October maintenance logs.

Lion Air did not respond to a request for comment.

In the report, Indonesian regulators recommended a redesign of the anti-stall system, the Maneuvering Characteristics Augmentation System, which automatically pushed the airplane’s nose down, leaving pilots fighting for control.

Boeing has already said it would remake the system and provide more information about it in pilot manuals.

Boeing’s safety assessment assumed pilots would respond within three seconds of a system malfunction, but on the accident flight and one that experienced the same problem the prior evening, it took both crews about eight seconds to respond, the report said.

Boeing has said that it cannot comment before the release of the report.

A panel of international air safety regulators this month also faulted Boeing for assumptions it made in designing the 737 MAX and found areas where Boeing could improve processes.

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