For JammedStab (and not the first time, I think)
As to what happens when full rudder is applied ….. well it happened.
Many years ago on a 757, and before corrective mods, a slow leaking L HYD required the system to be off-loaded until required for landing (Flaps, Gear & N/W Steering). I off-loaded the system in accordance with the QRH and the aircraft banked about 40 degrees but kept going straight ahead, just. This was instantaneous and verging on the violent. Switching on the L HYD again restored equilibrium.
It was extremely alarming and initially puzzling. However, the (then normal) progressive amount of rudder trim required on our fleet as we climbed into colder air, meant that in the cruise it was normal to have several divisions of trim applied. Turning off the L HYD also turns off the RUDDER RATIO. Boeing’s analysis showed that the amount of actual rudder displacement with full pedal deflection decreases with an increase of speed by a maximum multitude of 15 from Vmca to Mmo.
So now I know. I am glad they made it strong!
Prober
