I have a question. If a pilot is at a given altitude with a 727, autopilot engaged, and he/she needs to go down, or up. What is the right technique ?
1. Disengage the ALT Hold switch, then using the attitude knob of the autopilot until correct altitude is reached, then re-engaged ALT HOLD
2. Disengage the vertical guidance of the autopilot and use the trim or the yoke until correct altitude is reached, and then re-activate the vertical guidance in ALT hold mode.
Thanks for your input.