I completed a CATIII landing yesterday, however after releasing reverse thrust/autobrakes and turning off the runway, the autopilot disconnect master alarm went off, so i pushed the master alarm to turn it off, but the warning sirens would not stop and AP disonnect wouldnt leave from the EICAS. what did i do wrong?

 

EDIT: solved. for anyone that might have the same problem, you just have to press the autopilot disconnect button on the yoke twice.

I completed a CATIII landing yesterday, however after releasing reverse thrust/autobrakes and turning off the runway, the autopilot disconnect master alarm went off, so i pushed the master alarm to turn it off, but the warning sirens would not stop and AP disonnect wouldnt leave from the FMS. what did i do wrong?

 

You need to disconnect the AP properly by hitting the AP disconnect button (on the yoke, or via a command that you set up through the PMDG SETUP> menu) once, and then after a few seconds, once more. This is discussed in greater detail in the Intro Manual. Please have a look through that.