MSFS - What Happens When You Turn On the Scramjet Before Takeoff in the Top Gun Maverick Darkstar

Have you ever tried to turn on the scramjets before the tutorial suggests, before you even takeoff? The game wants you to wait until you are at least Mach 3 and 50,000 ft to turn them on, so what happens if you turn the scramjets on sooner? In this video, I will turn it on at 0 ft when I'm on the ground.
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