MAX’s Return Delayed by FAA Reevaluation of 737 Safety Procedures

[Peter H]

Originally Posted by Peter H

Nice find. I'm still having problems interpreting things though, any ideas on:
The deliberately broken microprocessor had become overwhelmed with data from the flight control system.
- If its "broken", how is it still working.
- If its "crippled" by how much.
- Or is it "restarting" after some sort of interrupt/reboot.
- Finally is the "overload" a transient effect, or the new status quo.

From the comments section of https://leehamnews.com/2019/06/28/bj...-max-software/
Bjorn Fehrm

June 28, 2019
The 737ng and MAX have two FCCs, each with two processors. Depended on the flight mode (autopilot or manual flight) these processors either divide the tasks between them or one is active and the other is standby. If there is a fault in the active microprocessor the inactive one can take over in the FCC. This is as I understand it I should add. There are descriptions of the FCCs and their global functions, but the exact working of the software is not public knowledge.

Re my question.
I now feel that the new "glitch" occurred when the tester faulted the "active" processor in the FCC, triggering a fail-over to the "standby" processor.
This gives obvious opportunities for disruption of normal service.