Rudder Boost - BOMBARDIER LEARJET 40 Pilot's Manual

RUDDER BOOST

The rudder boost system is provided to reduce rudder forces. Signals
from force sensors in both sets of rudder pedal mechanisms are read by
the ICs. The ICs then send rudder boost signals to the yaw damper ser-
vo. Rudder boost provides yaw servo torque proportional to rudder
pedal force, when either the pilot's or copilot's rudder pedal force or
the sum of their forces reaches 50 pounds. The rudder boost will over-
ride the yaw damper (if engaged) when this threshold is reached. When
the force on the rudder pedals is released, the yaw damper will resume
operation. The rudder boost system is armed when flap extension is
greater than 3° and the RUD BOOST switch is selected to On. The RUD
BOOST switch is located on the forward pedestal. When selected On,
the switch is dark and when selected OFF, OFF will be displayed in the
center of the switch. A white CAS illuminates when the switch is OFF
or the system is disabled by the IC or the yaw force interface box. An
amber CAS illuminates when the system is inoperative and not select-
ed OFF.
Dual, redundant power inputs are provided via the RUD FORCE cir-
cuit breaker on the right essential bus and the NOSE STEER COMPUT-
ER circuit breaker on the left essential bus. If both these power sources
should fail, the #2 IC-600 will disable rudder boost and provide appro-
priate annunciation.
The following CAS illuminations are specific to the rudder boost
system:
CAS
RUD BOOST INOP
RUD BOOST INOP
PM-132A
Color
Amber Rudder boost is inoperative and not selected
OFF.
White Rudder boost is selected OFF. Do not takeoff.
Pilot's Manual
Description
5-5