Hi,

When performing an ILS approach and disconnecting to fly the landing manually, if the touchdown zone is missed, the EICAS message "AUTOPILOT" and an aural beeper is triggered. I assume this is because the aircraft has passed the end of the glideslope.
The G/S annunciator on the FMA is crossed with an amber horizontal line, as per the manual on Part 2, Page 95:

"An amber horizontal line is drawn through the appropriate autopilot pitch or
roll mode annunciation when a flight mode fault is detected."

I have watched several videos of 757 landings with the ILS G/S signal visible on the PFD, but have not heard the beeper or seen the EICAS message.

Please inform if this is considered a true 'flight mode fault' or should G/S remain annunciated normally throughout the landing, thus not requiring this EICAS message or beeper?

Thanks