PowerBox Systems cockpit Instruction Manual page 17

The undercarriage should now retract. If not, hold button I pressed in until
the valve is triggered, and the undercarriage retracts. Press the SET button
to move on to the next stage of the procedure.
Connect the nosewheel door servo to output 1. Press the SET button to clo-
se the nosewheel door; repeat the procedure in the next set-up screen to
open the door.
The succeeding steps are used to set up the second front wheel door and
the rear wheel doors; the procedure is identical to that described for the
nosewheel door. The servo for the right-hand wheel door is connected to
output 2, that for the left-hand wheel door to output 3.
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