The Final Report on the Indo crash will be out on Friday
Quote:
Lion Air crash investigation faults Boeing 737 Max design and oversight
The families of victims in last year's Lion Air crash have been told by Indonesian investigators that poor regulatory oversight and the design of Boeing's 737 Max contributed to the fatal disaster.
Investigators on Wednesday provided victims' relatives with a summary of their final report on the crash, which killed 189 people. Details from the briefing for family members were shared with CNN by Anton Sahadi, a spokesperson for the relatives.
The report summary said that faulty "assumptions" were made during the design and certification of the 737 Max about how pilots would respond to malfunctions by the Maneuvering Characteristics Augmentation System (MCAS), according to the presentation seen by CNN.
MCAS lowers the nose of the plane when it receives information that the aircraft is flying too slowly or steeply, and at risk of stalling. The system was vulnerable because it relied on a single angle of attack (AOA) sensor, investigators said.
The AOA sensor on the doomed Lion Air plane had been miscalibrated during a repair, according to investigators. But the airline's maintenance crews and pilots couldn't identify the problem because one of the aircraft's safety features the AOA Disagree alert was not "correctly enabled during Boeing 737-8 (Max) development," they said...
...A spokesman for Indonesia's National Transportation Safety Commission said Wednesday that its final report will publish on Friday.
It has been sent to the US National Transportation Safety Board and other relevant parties, and those parties have replied with comments, the spokesman said.
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Note:
The Indonesian NTSC investigated that the replacement vane had been a recertified Rosemount Aerospace's AOA sensor which had been serviced by a USA company in Florida. Please read the following news article for details: Faulty 737 Sensor In Lion Air Crash Linked To US Repairer .
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https://edition.cnn.com/2019/10/23/b...air/index.html-
https://www.thejakartapost.com/news/...-repairer.htmlSlightly different version of the same news from reuters
Quote:
Lion Air Families Told 737 MAX Design Flaws Linked To Deadly Crash
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 on Wednesday ahead of the release of a final report.
Contributing factors to the crash of the new Boeing (BA.N) 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...
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https://www.reuters.com/article/us-i...-idUSKBN1X20EJ