E-flite T-34 Mentor 25 ePTS RTF manual - Manual (Page 21)

21 E-flite T-34 Mentor ARF Assembly Manual
 13. Check the movement of the aileron using the
transmitter. When the aileron/elevator stick is moved left,
the left aileron will move up and the right aileron will
move down.
Reversing Direction of Flight Controls
If you find any of the control surfaces moving in the opposite
direction (example shown below), you will need to use the Servo
Reversing feature of your radio system. Follow the instructions
for the radio to enter the programming and change the servo
reversing of the offending control surface.