Boeing has completed work on an upgrade to the anti-stall system known as the Maneuvering Characteristics Augmentation System
that has been linked to two crashes, said a person familiar with the matter.
Known as the Maneuvering Characteristics Augmentation System
, it operated in the background and pilots hadn't been told it existed.
The initial investigation report suggests a fault in the aircraft's MCAS (Maneuvering Characteristics Augmentation System
) or flight control system.
"Instead of going back to the drawing board and getting the airframe hardware right," writes Travis, "Boeing relied on something called the 'Maneuvering Characteristics Augmentation System
,' or MCAS." They then used software to mask the problematic hardware.
That change in geometry apparently altered the airplane's aerodynamics to the point that Boeing developed flight control system software--the Maneuvering Characteristics Augmentation System
(MCAS)--to ensure the MAX's handling characteristics were similar to previous models, in part to reduce airline training costs.
After the FAA announced that it "recently found a potential risk that Boeing must mitigate" before returning the 737 MAX to service, BofA Merrill Lynch analyst Ronald Epstein said it is his understanding that this is a separate issue from the MAX's Maneuvering Characteristics Augmentation System
, but one that surfaced during FAA MCAS-related simulator testing.
The FAA went on to highlight that it is continuing to review Boeing's Maneuvering Characteristics Augmentation System
(MCAS), the state-of-the-art software that, along with improper training, was deemed responsible for the downings of both of Lion Air Flight 610 and Ethiopian Airlines Flight 302, which killed 189 and 149 people, respectively.
The Boeing manufacturing Company is finalizing changes to the model's maneuvering characteristics augmentation system
(MCAS) flight-control law software.
The hearing was the third in Congress since the global grounding and again focused on the Maneuvering Characteristics Augmentation System
(MCAS), a flight handling system linked to both crashes.
To make the 737 Max handle the same as the 737 NG, and to prevent some aerodynamic stall situations, Boeing added what's known as the Maneuvering Characteristics Augmentation System
(MCAS)--behind-the-scenes software which now is suspected in both Max crashes.
Boeing 737 MAX pilots will get increased ground training on the aircraft's Maneuvering Characteristics Augmentation System
(MCAS) but won't drill the anti-stall software in the sim according to updated training requirements under consideration by the FA A.
Like: It appears anti-stall software in the 737 MAX, called MCAS for Maneuvering Characteristics Augmentation System
, which controls horizontal stabilizer deflection in response to the airplane's angle of attack (AOA) sensing vanes, repeatedly overrode pilot upward pitch inputs from the control yoke, causing each airplane to automatically pitch rapidly downward in a rapid oscillation sequence, which eventually caused the pilots to be overwhelmed and lose control of the aircraft with fatal results.