B737 MCP modes operation
Hi!
Following question relates to the 737NG.
Suppose you are flying level, in ALT HOLD, HDG mode and A/T SPD mode towards your ILS intercept.
When you get cleared for the ILS approach, you press the APP MCP button.
Question:
Does the APP light come up immediately, and the HDG light extinguishes, or does the HDG light remain ON until Localizer intercept begins?
Same question regarding APP and ALT HOLD, in relation the Glide Slope capture. When does the ALT HOLD light extinguishes? Upon pressing APP or upon capturing the G/S?
I am not referring to the PFD mode annunciators, just the MCP button/lights.
Stamatis