The APP light lights up immediately, and HDG light stays on until localizer capture.
The ALT Hold light extinguishes when you capture the G/S.
I see. So it is possible to have
two lateral and
two vertical mode lights ON simultaneously. I find this interesting.
I assume then that the same happens when on an intercept to our flight plan "magenta line" while in HDG mode, and engaging LNAV? LNAV light goes ON but the HDG light will once again remain ON until the A/P captures and tracks the magenta line?
Thank you for your reply regarding de-activating the APP mode after capturing the G/S.
Stamatis