Hello Erfang,What (Checklist) Mode is active when you're trying to run a checklist?Did you hear the pilot sing "Into the Air Junior Birdman" when you activated FS2crew?Last, are you running an English version of FS2004? Please take one more look at how you set up your Main and Secondary Keys. Best regards,Bryan

Bryan, The checklist active is "Before Start", and the song was indeed played. I am running the English version of the Simulator with the 9.1 update. The secondary key works perfectly fine, just the main key that I am having trouble with.

Hello Erfang,Try re-assigning the Main Button to another joystick button or keypress.Double check that you are indeed changing the assignment for "Increase Decision Height (Concorde)."-Bryan

I programmed the "Main and Secondary" key press as mandated by the manual. After doing everything, everytime I hit the Main Key, no sound play. My FS2Crew is definitely active. Thanks