Final answer:
Yes, the FMGC can still auto-tune navaids if the NAV key is selected on an RMP, as it is designed to automatically select the appropriate navigation aids unless manually overridden.
Step-by-step explanation:
If the NAV key is selected on either Radio Management Panel (RMP), the Flight Management and Guidance Computer (FMGC) in an aircraft can still auto-tune navaids. This function of the FMGC is designed to ensure that, unless manually overridden by the selection of an alternate frequency, the system will continue to automatically select the appropriate navigation aids based on the flight plan data and phase of flight. However, the ability of the FMGC to auto-tune might be limited if the pilot deliberately selects a frequency on the RMP that overrides the FMGC setting.
If the NAV key is selected on either RMP, the FMGC can still auto tune navaids.
The Navigation (NAV) key on the Radio Management Panel (RMP) is used to manually select and tune to a specific navaid, such as a VOR or an NDB. However, even if the NAV key is selected, the Flight Management and Guidance Computer (FMGC) can still auto tune navaids.
The FMGC continuously monitors and updates the navigation information for the aircraft. It has a database of navaid frequencies and will automatically tune to the correct navaid when it is required for the flight plan. This enables the aircraft to navigate accurately using the auto-tuned navaids.