1. In the cockpit ceiling above the pilots’ side windows and further back in the aft cockpit roof there are small levers/knobs with the plackard: „CONDITIONED AIR”.What is the function of these controls?
2. On the outside of the aircraft in the lower cargo door operating panel there is a switch and rotary knob with the plackard: „BRAKE GUIDE”, „BRAKE SELECT”, ROLLER SELECT”. Again, what is the function of these controls? ( I assume something to do with the cargo handling system).
3. Is the forward entry door electric actuator motor fed by the direct batt bus? To be able to open it on a cold/dark unpowered a/c?
1- mechanical valves that close off airflow to several of many vents.
2- You are correct cargo loading and anti cargo rollout device control.
3- Fwd LH most fwd entry door is fed by the ground service A/C bus, it can be disengaged to open manually but is very heavy with the slide pack on or opened by a pneumatic motor from the inside as an emergency provision.