Figure 87: Stabilizer trimming (ST) – ram-air flow (CAS) diagram
This is a logic law of the FBW and is based on tick longitudinal deflection vs ram air pressure. This
control law makes the pilot “feeling” of flying at an airspeed-stable aircraft. The law is also intended
to increase the flight safety when decelerating. As the aircraft is neutrally stable by airspeed, it
should increase the angle of attack in decelerated flight. The aforementioned control law prevents
from this by deflecting stabilizers to decrease the AoA.
When accelerating, to keep the aircraft level, it should be trimmed "nose down" as the airspeed
increases.
Lateral Channel
Roll control is performed by flaperons working as ailerons (flaperons are also deflected down as flaps
when in the takeoff-landing mode) and by differential stabilization. With increased angle of attack,
the rudders are used to control roll (see Directional channel).
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