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But as a result of the larger engines, which are placed higher and further forward of the wing, the jet’s balance changed. To address that, Boeing put in place more anti-stall protections, Leeham Co analyst Bjorn Fehrm said in an online post cufflink outlet uk sale. An automated protection system called the Maneuvering Characteristics Augmentation System (MCAS) kicks in when the angle of attack is too high, when the plane’s nose is too elevated, threatening a stall. On paper, it measures the angle between the air flow and the wing. But it is so fundamental to flight that historians say the only instrument on the Wright Brothers’ first aircraft was a piece of yarn designed to measure it. (bit.ly/2KcBlVT)..
If the angle of attack is too high, the airflow over the wing is disturbed, throwing the plane into an aerodynamic stall. One of two angle of attack sensors on the Lion Air jet was faulty, according to Indonesian investigators cufflink outlet uk sale. The U.S. Federal Aviation Administration (FAA) last week warned airlines that erroneous inputs from those sensors could lead the jet automatically to pitch its nose down even when autopilot is turned off, making it difficult for pilots to control. Boeing has delivered 241 of the jets to customers since it entered service last year, according to its website..
Major operators include Southwest Airlines, American Airlines, Norwegian, Lion Air, Air Canada, China Southern, China Eastern and flydubai cufflink outlet uk sale. Another 4,542 have been ordered but not yet delivered. Lion Air’s flight manual did not contain information about the new anti-stall system, according to investigators and an airplane flight manual seen by Reuters. U.S. pilots were also not made aware in training courses, pilot unions say. American Airlines said it was “unaware” of some of the functionality of the MCAS system. [L4N1XQ23Q]..
Boeing Chief Executive Dennis Muilenburg told Fox Business Network on Tuesday that Boeing provides “all of the information that’s needed to safely fly our airplanes”. Pilots can stop the automated response by pressing two buttons if the system behaves unexpectedly, the FAA says. That action is set out in a checklist used by Lion Air pilots for in-air troubleshooting, an instructor said cufflink outlet uk sale. It is also required to be committed to memory by pilots. Pilots on a flight from Jakarta to Bali the day before the crash experienced a similar sensor issue but managed to land safely by turning off the system, the New York Times reported..
The FAA holds the main responsibility for certifying Boeing jets and training programs for pilots, but local regulators also issue approvals for airlines based in their countries. An unresolved question is how Boeing measured the system’s reliability and on what basis the FAA certified it as safe cufflink outlet uk sale. An FAA document on training requirements for 737 MAX pilots transitioning from the older 737NG, available online (bit.ly/2B8qhG5), has no reference to the new anti-stall system. Lion Air says it followed a training regime approved by U.S. and European regulators. The training was restricted to three hours of computer-based training and a familiarization flight..