Learjet 60 - Director Function; Pedestal NOSE DN-OFF-NOSE up Switch - Autopilot; Pitch Trim Selector Switch - Autopilot Function; SYNC Switches

Learjet 60

Pilot's Manual
PITCH TRIM SELECTOR SWITCH
- AUTOPILOT FUNCTION
When the autopilot is engaged, the autopilot
maintains aircraft pitch
trim through the secondary motor of the horizontal
stabilizer pitch
trim actuator if the
PITCH TRIM selector switch on the
pedestal is in
the PRI or SEC position
. The autopilot will not engage or will
disen-
gage if the PITCH TRIM selector
switch is moved to the OFF
position .
CONTROL WHEEL TRIM SWITCHES -
AUTOPILOT/FLIGHT DIREC-
TOR FUNCTION
When either Control Wheel Trim
switch (arming button depressed)
is
moved to
any
of
the four positions (LWD,
RWD,NOSE UP or NOSE
DN),
an aircraft trim input is made and
the autopilot will disengage
.
If the arming
button is not depressed, the
on-side switch may
be used
to input
lateral commands (LWD and
RWD) and vertical
commands
(NOSE UP
and NOSE DN) to the
autopilot . Using this feature
causes
active
modes (except GS) in the applicable
axis to disengage
and re-
vert to the attitude
hold mode .
Armed modes are not
effected . The
control wheel
trim switch has no
effect on the flight director
.
PEDESTAL NOSE
DN-OFF-NOSE UP
SWITCH -
AUTOPILOT FUNC-
TION
The NOSE
DN-OFF-NOSE UP switch,
located on the
pedestal trim
control panel, may
be used to disengage
the autopilot or
to make trim
adjustments with the
autopilot pitch and
roll axes
inhibited . With the
PITCH TRIM selector
switch in the SEC
position, actuation
of secon-
dary pitch trim through
the NOSE
DN-OFF-NOSE UP
switch will dis-
engage the autopilot,
extinguish the
green light above
the
AP
button,
and sound the
autopilot disengage
tone . When the
autopilot is disen-
gaged through
the NOSE
DN-OFF-NOSE UP
switch, the flight direc-
tor will
remain active and will
display steering
information from
the
flight
guidance computer .
SYNC
SWITCHES
The SYNC switches in
the control wheels are
normally
used with the
on-side flight director to
change a vertical
mode
(except GS, LVL
CHG
and ALTS) reference
values without
reselecting
the mode . The
only
lateral mode in
which SYNC switches
are active
is roll attitude
hold
(ROLL) .
PM-123
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