Originally Posted by
lospilotos
Clue is on the name, "ALT intervention", it removes the altitude constraint. As a consequence the speed also gets removed as you cannot have a speed constraint without an altitude constraint on the same line...
Never actually tried that before. If the altitude is just an intentionally out of the way altitude entered in order to be able to get the speed entered as a restriction, wouldn't deleting that contstraint just change the commanded speed back to whatever is in VNAV? Might work.