Instructions
Download the SR-71 Blackbird from the Flight Simulator Talk website listed in the Resources section. Run the executable file to load the program. When the program is loaded, select Tutorial 1 from the main menu. Once you are airborne, push the throttle completely forward (go "full throttle") to automatically turn on the afterburners.
Press "I" and then "Shift+F4" to turn on the afterburner for the Concord, which is available as an add-on. Alternately, press "Shift+F4" to turn on just the afterburner, then press "I" if you wish to turn on both the afterburner and the smoke effects for the Concord.
Press "Shift+F4" to turn on the afterburner for the F-14 Tomcat, which is available as an add-on.
Fix afterburner problems with the F-18C and F-18E Hornet by downloading a patch from Abacus for the gauge file that controls the afterburner. "FSX" comes with the F/A-18 Hornet, but the F-18C and F-18E versions are provided by other companies as add-ons.
Download the add-on aircraft to the \SimObjects\Airplanes subdirectory of the folder in which you installed "Flight Simulator X." Open this directory in Windows Explorer. In it, you'll find each aircraft installed in its own subfolder. However, sometimes an effects file ends up in the wrong folder. All effects files should be located in the locations specified in the file "aircraft.cfg" inside each aircraft's base folder. Making sure that all effects files are in the appropriate effects folders should ensure that afterburner effects work properly. This usually fixes the problems with add-on aircraft.