This is what you do. Start FSX flight in a plane and then go to the addons menu(ALT key) and click FSUIPC. In FSUIPC click on the tab saying something about buttons. Pull the levers one at a time back into the red zone and FSUIPC should show something say joystick number and button number. Look on the right side and click on the the top drop down menu for button press. Scroll through the list and find engine #(1,2,3,4) set. in the perameters box set -100 for full reverse thrust. Then go to the button release menu (just below) and scroll til you see engine #(1,2,3,4) idle. This is so when you push the levers forward out of reverse thrust the engines don't stay locked in reverse. Repeat this for all the engines/levers you want. YOU MUST HAVE A REGISTE RED VERSION OF FSUIPC. I hope this helps you because this is exactly how it worked for me and it always works. If you have any questions Email me at ericlanegen(at)gmail(dot)com use the subject -FSUIPC reverse thrust- B)