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can be made by using the NOSE DNOFF-NOSE UP switch as discussed
in PITCH TRIM SYSTEM.
CONTROL WHEEL STEERING (CWS) SWITCHES
Depressing the control wheel steering (CWS) switch, located on the
inboard horn of each control wheel, uncouples the autopilot servo
clutches, if engaged, and allows for flying the aircraft to a new reference
value in certain modes. Manual pitch, roll, and trim commands
can be made while the switch is depressed. When the switch is released,
the system will resynchronize to the existing (new) values in
MACH, IAS, ALT HOLD, or Attitude Hold modes. If the flight director
is not engaged, depressing the CWS switch activates the system in
Pitch and Roll Attitude Hold mode and synchronizes to the values existing
at the time of switch release. Depressing the CWS switch will
cancel Go-aroundmode and activate Pitch Attitude Hold mode.
CONTROL WHEEL FD CLEAR SWITCHES
The FD CLEAR switches, located on the inboard horn of each control
wheel, are used to stow the on-side flight director command bars.
PM-121
5- 25
Change 2
Pilot's Manual
Learjet 31A
SYSTEM TEST SWITCH -A/P RESET FUNCTION
The rotary-type system test switch, located on the pilot's instrument
panel, is used to reset the autopilot in the event it disengages and cannot
be reengaged. The reset sequence is initiated by rotating the system
test switch to A/P RESET and then depressing the switch PRESS
TEST button. On the ground, both autopilots will test and servos will
engage momentarily. In flight, only the selected autopilot will test
and the servos will not engage .
YAW DAMPER SYSTEM
The yaw damper augments aircraft stability by opposing uncommanded
motion about the yaw axis and provides turn coordination.
The yaw damper is provided by the yaw axis of the KFC 3100 flight
control system. Theyaw damper operates independent of the autopilot.
YAWDAMPER CONTROL
The yaw damper button and annunciator are located in the autopilot
controller, and provides yaw damper selection and indicating functions.
Theyaw damper engages when the autopilot is engaged, or by
depressing the YD button on autopilot controller. When the yaw
damper is engaged the green light above theYD button will be illuminated.
If the yaw damper is already engaged, depressing theYD button
will disengage the yaw damper.
CONTROL WHEEL MASTER SWITCHES- YAW DAMPER FUNCTION
The Control Wheel Master Switches (MSW), located on the outboard
horn of the pilot's and copilot's control wheels, may be used to disengage
the yaw damper. Depressing either the pilots or copilot's Control
Wheel Master Switch (MSW) will apply a signal which cancels
the yaw damper engage signal. When theyawdamper disengages the
green light above the YD button will extinguish and theyaw damper
disengage tone will sound.
5- 26
PM-121
Original
l.earjet 31A
RUDDER BOOST SYSTEM
The rudder boost system is installed to provide reduced rudder pedal
force, increased directional control effectiveness and improved takeoff
performance. With the rudder boost on, minimum control speedground
(VMCG), takeoff speeds and distances are all lower. The rudder
boost system consists of a computer, force sensors, flap position
switch, RUDDER BOOST Switch, and associated aircraft wiring. The
yaw damper servo provides the "boost" to assist the pilot in moving
the rudder in the desired direction. The rudder boost system is supplied
28 VDC through the 7.5-amp RUDDER BOOST circuit breaker
on the pilot's circuit breaker panel.
Normally the RUDDER BOOSTSwitch, on the pilot's switch panel, is
left on at all times. Applying approximately 35 pounds of force to either
rudder pedal will cause the yaw servo to automatically engage
and apply force to the rudder in the same direction as the pilot. As pilot
input force is increased, the servo force will also increase up to the
maximum yaw servo force. The flap position switch is used to reduce
the maximum servo force available when the flaps are up. When the
rudder boost engages, the green RB annunciator, on the autopilot controller,
illuminates to indicate rudder boost is active. If the yaw
damper is on when the rudder boost engages, the system will make a
smooth transition from yaw damper to rudder boost. A failure of the
system is indicated by illumination of the amber RB annunciator on
the autopilot controller. Self-test of the system is initiated during system
power-up. Refer to the FAA Approved AFM for self-test and use
of the rudder boost system .
RUDDER BOOST SWITCH
Pilot's Manual
Arming of the rudder boost system is controlled by the RUDDER
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