Hi, The a/p is on, and tracking the FMC route, but the ALT button does nothing. The plane just goes up and down, way past the set alt. Anything I should be doing? Is there anything that shows the set v/s rate, if the V/S button is active, when I'm adjusting it? Is the plane manually throttled, with the speed setting just a speed on elevator (climb/descent) system? Thanks is advance.