The specs called for Jetronics air valves instead of the mechanical ones in the kit. This plane has 3 2-way Jetronics for the gear, doors, and speed brake, and a Jetronics brake valve. It uses a Jetronics sequencer for the doors and has a air pressure safety switch that lowers the gear when the gear air system pressure gets low. That safety switch is from Dan Gill at Detals4Scale...

For the EZ-Drops in the inner and outer pylons, simple single-action button valves driven by JR mini servos are used...