B777 Speed Trim
Pitch trim switches on B777 cause the trim reference speed to ramp up or down (depending on direction of switch activation) at a rate of 10 knots per second. Trim reference speed is limited to the range of top of speed tape amber band (on the low end) to Vmo/Mmo (on the upper end). Reference speed limits form the first layer of B777 underspeed and overspeed protection functions. B787 pitch trim behaves identically.