ParkZone PKZ3680 - Manual (Page 9)

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With the aileron stick pushed right, the right aileron should move up and the
left aileron should move down.
Move the rudder stick left and right to check yaw control. When the stick is
pushed to the right the rudder should also move to the right.
With the rudder stick pushed to the left, the rudder should move to the left.
If at any time during the test the controls respond in the opposite direction, it
may be necessary to reverse/change the direction of operation of the flight
controls. Use the servo reversing features of your radio to change the direc-
tion of the various flight controls.
Once you’ve reconfirmed the flight control directions, all controls should be
functioning properly. However, if you continue to encounter any problems with
your P-51D responding properly to the transmitter, do not fly. Call the Horizon
Support Team at 1-877-504-0233.
Note: ParkZone recommends setting Dual rates at 70% for first
flights. Dual rates and expo (if available) can then be tuned
to the pilot’s tastes.