POST Online Media Lite Edition



 

Lion Air families told Boeing 737 MAX design flaws linked to deadly crash

Christian Fernsby |

KEY POINTS
  • Contributing factors to the crash included incorrect assumptions on how an anti-stall device called the Maneuvering Characteristics Augmentation System
  • The briefing slides showed that a lack of documentation also contributed
  • “Deficiencies” in the flight crew’s communication and manual control of the aircraft contributed as well

Mechanical and design issues contributed to the crash of a Lion Air 737 MAX jet last October, Indonesian investigators told victims’ families in a briefing ahead of the release of a final report.

Article continues below



Topics: LION AIR    BOEING    CRASH   

Contributing factors to the crash of the new Boeing jet, which killed all 189 on board, included incorrect assumptions on how an anti-stall device called the Maneuvering Characteristics Augmentation System (MCAS) functioned and how pilots would react, slides in the presentation showed.

The briefing slides showed that a lack of documentation about how systems would behave in a crash scenario, including the activation of a “stick shaker” device that warned pilots of a dangerous loss of lift, also contributed.

“Deficiencies” in the flight crew’s communication and manual control of the aircraft contributed as well, the slides showed, as did alerts and distractions in the cockpit.

The deficiencies had been “identified during training,” the slides said, without elaborating.

Reliance on a single angle-of-attack sensor made MCAS more vulnerable to failure, while the sensor on the plane that crashed had been miscalibrated during an earlier repair, according to the slides.

The final report will be released on Friday.


What to read next

Lion Air crash victims' families to rally as hunt for wreckage steps up
Lion Air ends search for black box, Indonesia plans own probe
Probe result shows crashed Ethiopian plane pilots followed required Boeing procedures