Could 727 pilots really get more capability from the airplane by "tricking" the flap system? Did that lead to the TWA 841 incident. I'll tackle these two topics in this video.
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Note, the maximum mach limit in the 727 was either .90 or .88 depending on the exact model. That's the upper speed limit when at altitude. At low altitudes the plane is limited by indicated airspeed, not by the mach number. This is because the speed of sound decreases with a drop in temperature, and indicated airspeed decreases with altitude for a given true airspeed. Thus at high altitude, you can be way below the IAS limit, but creeping up on the mach limit as the speed of sound decreases.
