Learjet 60 - Control Wheel Master Switches -Roll Trim; Control Wheel Trim Switches-Roll Function; Roll Trim; Trim Indicators (Figure 5-3)

Pilot's Manual
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Learjet 60
ROLL
TRIM
Roll trim is accomplished
by positioning the
aileron trim tab on the
inboard trailing edge
of the left aileron through
actuation of the roll
trim actuator . The roll trim
actuator is an
electrically-operated, rotary-
type
actuator connected to the
aileron trim tab by
a push-pull rod .
The
system is controlled
through the pilot's and
copilot's control
wheel trim switches . Trim tab
position information is
displayed on an
indicator mounted on the
center instrument
panel . The roll trim sys-
tem operates on 28 VDC
supplied through
the 7 .5-amp ROLL TRIM
circuit breaker on the pilot's
circuit breaker panel
.
CONTROL WHEEL
TRIM SWITCHES-ROLL
FUNCTION
Each control
wheel trim switch is a
dual-function (trim and trim
arm-
ing) switch
which controls roll trim
and primary pitch
trim . One
switch is located
on the outboard
horn of each control
wheel . Each
switch has four
positions : LWD,
RWD,NOSE UP, and NOSE
DN . The
arming button
on top of the
switch must be depressed
for trim mo-
tion to
occur . Actuation of either
control wheel trim switch
to LWD or
RWD will signal the aileron
trim tab actuator to move the
tab as re-
quired to lower the
appropriate wing . Actuation of the
pilot's switch
will override actuation of
the copilot's switch . Actuation
of either
switch to any of the four positions
(LWD, RWD, NOSE-UP,
or NOSE-
DN) will disengage the autopilot
if the trim arming
button is de-
pressed .
CONTROL
WHEEL MASTER SWITCHES - ROLL
TRIM
A Control Wheel Master
Switch (MSW) is located beneath
the control
wheel trim switch on
the outboard horn of each control
wheel . In ad-
dition to the
switches' other functions, either Control
Wheel Master
Switch (MSW),
when depressed, will inhibit roll trim . The
roll trim is
inhibited
only as long as the Control Wheel Master
Switch (MSW) is
held .
5- 1 6
TRIM INDICATORS
Figure 5-3
PM-123
Change 2