Questions tagged [mcas]

For questions related to Boeing's Maneuvering Characteristics Augmentation System (MCAS).

Filter by
Sorted by
Tagged with
47
votes
3answers
24k views

What is the technique or procedure to disable/disengage the MCAS on Boeing 737 Max 8 & 9 Aircraft? [closed]

With regard to the recent crashes involving the Boeing 737 Max 8 aircraft, where according to preliminary reports, it appears to be related to the MCAS, which is a safety system that pushes the nose ...
9
votes
2answers
4k views

Did A320 NEO need an equivalent to 737 MAX MCAS because of its bigger engines?

We read that MCAS on the Boeing 737 MAX was needed because of the new, bigger, heavier engines of the MAX compared to the previous 737 versions. The closest equivalent to MCAS on the Airbus A320 NEO ...
7
votes
3answers
727 views

Has the Boeing 737 MAX MCAS system successfully prevented a stall or approach to stall condition outside testing?

The Boeing 737 MAX MCAS system has been in the press a lot as it has been implicated as a possible cause of 2 fatal crashes. The MCAS system was put in to prevent a wing stall caused by excessive ...
13
votes
4answers
2k views

Can computer imposed inputs be overridden on the Boeing 737-MAX?

During Lion Air Flight 610, a Boeing 737-MAX, it seems that the angle of attack sensors caused the software to believe the aircraft was stalling, thus initiating a nose-down pitch to recover from the (...
12
votes
4answers
636 views

Why would Boeing's MCAS be preferable to a modified Feel and Centering Unit?

According to some sources, the purpose of MCAS on Boeing's 737 MAX variants is to increase the back-force needed to further raise the nose when flying manually at high angles of attack, in order to ...
4
votes
1answer
660 views

How the stabilizer cutout switch functionality has changed from Boeing 737 NG to 737 MAX?

The Boeing 737 NG has stabilizer trim cutout switches marked as MAIN ELECT (left) and AUTOPILOT (right). Turning off the right switch disables automatic stabilizer trim in autopilot mode and automatic ...