How do you identify a localizer if it doesn't appear on the PFD?

Identifying a localizer that does not display on the Primary Flight Display (PFD) can be achieved by listening for the Morse code signal transmitted by the localizer. Each localizer has a unique Morse code identifier that pilots can hear through their aircraft's navigation audio systems. This audio identification is crucial for confirming that the pilot is tuned into the correct localizer frequency, especially in situations where visual cues or indications on the PFD might be absent or malfunctioning.

The other methods, while they may have roles in navigation, do not specifically address how to identify a localizer when it’s not shown on the PFD. For example, visual flight rules pertain to navigation under visual conditions and do not directly relate to identifying instrument approaches. Checking radio frequencies is a preliminary step but does not provide confirmation that the localizer signal is being received, as would be evident through the Morse code.