Originally Posted by
ukv1145
I think there is some confusion here. Mode 4 and all its sub modes are vertical modes only, based on rad alt, not look forward based on the database.
Agree.
All modes 1 to 6 are 'non-database' modes, all of which use the RADALT height as their primary input.
They are all defined automatically by the a/c configuration and require no pilot input.
The look ahead mode (using the database) is not numbered, hence the confusion I guess
