Learjet 60 - Damper Function; FD CLEAR Switches; Yaw Damper Control; Yaw Damper System

Pilot's Manual
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Learjet 60
FD CLEAR
SWITCHES
The FD CLEAR
switches are used to remove the
V-bars and cancel
any selected vertical
or lateral mode from the
on-side flight director .
FD CLEAR has no
effect if the autopilot is coupled
to the on-side
flight director .
YAW DAMPER
SYSTEM
The yaw damper augments
aircraft stability
by opposing uncom-
manded motion about
the yaw axis and
provides turn coordination
.
The yaw damper
is provided by the yaw
axis of the autopilot/flight
guidance system
. The yaw damper operates
independent of the auto-
pilot .
YAW
DAMPER CONTROL
The yaw damper
button and annunciator
are located on the FCP . The
yaw damper engages when the autopilot
is engaged, or by depressing
the YD button on the FCP . When
the yaw damper is engaged,
the
green light above the YD button
will be illuminated . If the
yaw
damper is already engaged, depressing
the YD 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 disen-
gage the
yaw
damper . Depressing either the pilot's or copilot's Con-
trol Wheel Master Switch (MSW) will disengage the yaw damper
.
When the
yaw
damper is disengaged through pilot action, the yaw
damper disengage tone will sound, and an amber YD annunciator
on
the
EFIS will flash for 5 seconds, then extinguish . The green indicator
light
above the YD
button on the
FCP will also extinguish .
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PM-123
Change 2