B737 Max suddenly entering CWS Mode

Hello, how are you?

I would like to report a very annoying bug that affected a flight between KPAE-BIKF, when I arrived at the crossing, for some reason the plane handed over the controls to me and I went to check and the Autopilot was still active, until then, I unhooked it and tried to turn it on again, again, the manual control was still in my hands and both the PFD and the MCP showed the Autopilot on, on the PFD, it said that the VNAV and LNAV were deactivated even though they were active, I use the cell phone sensors as control.

As far as I know, the CWS can only override if the pilot interacts with the joystick, but if this happens, the PFD shows it as CWS active and returns after activating the CMD again. Another important point to highlight is that this was not supposed to happen since with the autopilot active the cell phone sensor does not have any type of interaction with the aircraft.

Quote from Jet-Pack (IPACS)

CWS is basically a bank angle or pitch angle hold function internally. That is the basic mode the aircraft reverts to in case something goes wrong. Perhaps the route was temporarily lost at one of the waypoints causing it to drop out of LNAV. But to be able to reproduce this I need more details.

Can you please explain in more detail when this happened? Please post a screenshot of the flight path in your recent flights history as well as a screenshot of the exact route you were using at the time? I'll try and replicate why LNAV & VNAV disengaged.

There were no problems on the route and normally when there is a discontinuity the plane will not give you manual control, it activated the CWS mode suddenly in cruise... I will send the print of the route below

Here it is, the incident occurred right after the "DIABO" fix

Quote from Art69

What do you mean by "they were active"? The green light does not mean this. In all new Boeing aircraft, means wich can be deselected or not by the pilots. A tipicall example is when the aircraft is in wing level mode after take off and not in hdg mode. When you press the TOGA button, the green light of LNAV goes off and can no longer be disarmed, but on the FMA remains hardcoded in the autopilote mode.

I understand that this is a misunderstanding for those that does not know very well how the Boeing aircraft system works.

So you must explain better , what you mean by that.

They were indicated on the PFD but did not follow anything that was filled in the Flight Plan.