Quote:
Originally Posted by tgrayson  The usual problem is too much static stability at high speeds, because the aerodynamic center shifts rearward. The aircraft wants to nose over. |
Right, but that doesn't have anything to do with dynamic stability. The dynamic part is it coming
back to level. As far as the mach trim goes, it trims the nose up a bit as the speed increases so *if* the plane noses over (due to turbulence or the captain falling asleep on the yoke), it will be more likely to come back to level through the process of dynamic stability. Hence it being required per part 25 and why our MEL book says that if the mach trim is out we are limited to hand flying no faster then 250 knots.