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Manual AP Control
The airplane can be controlled manually when
the autopilot is engaged. The bottom portion
(barrel) of the control wheel trim switch
(CWTS) can be used as a manual controller if
the arming button, on top of the switch, is not
depressed (Figure 16-47). Manual control is
only possible from the CWTS on the coupled
side.
Moving the barrel forward or aft, without de-
pressing the arming button, commands cor-
r e s p o n d i n g p i t c h c h a n g e s t h r o u g h t h e
autopilot. Left or right movement (arming
button not depressed) commands roll changes.
Once the AP is engaged, depressing the arm-
ing button and moving the barrel in any di-
rection disengages the autopilot (but not the
YD).
When manual control is used to command roll,
any FD lateral modes previously captured (ex-
cept APP and LOC) will be cleared and the AP
will maintain the new roll attitude, existing
when the barrel is released. Similarly, when
a pitch change is commanded, any FD pitch
modes that were captured (except glideslope)
will be cleared and the AP will maintain the
new pitch attitude, existing when the barrel is
released.
Once glideslope, approach or localizer has
been captured, manual control barrel pitch
and roll commands will not be followed.
Touch Control Steering (TCS)
The touch control steering (TCS) switch is
used to temporarily take control from the au-
topilot when it is engaged. It can also be used
as a FD pitch or roll sync switch when the AP
is disengaged.
With autopilot engaged, depressing and hold-
ing either TCS button disengages the clutch on
the pitch and roll servos. This does not dis-
engage the AP, but allows the airplane to be
maneuvered as desired. The crew should not
apply control wheel pressure when the AP is
engaged unless the TCS button is first de-
pressed and held. Applying aileron or eleva-
tor control wheel pressure without depressing
the TCS may result in an AP monitor discon-
nect.
While the TCS button is held depressed (AP
engaged), a white “TCS” annunciator appears
at the top of the PFDs. In addition, selected
FD modes remain engaged and the command
bars sync to the existing airplane attitude.
Once released, the pitch and roll clutch ser-
vos re-engage and give airplane control back
to the autopilot. Previously engaged vertical
modes (SPD, VS or ALT) will synchronize to
the new existing flight conditions and lateral
modes will attempt to recapture. If flight level
change (FLC) was engaged, the FD will re-in-
tercept the previously selected profile.
If FD lateral modes were not engaged (ROL
hold), and the TCS button is released at bank
angles greater than 30°, the autopilot will roll
the airplane to 30° and maintain that bank
angle. If the bank angle is within 6° of level
flight, when the TCS button is released, the AP
will roll the airplane to a wings level attitude.
When the AP is not engaged, the TCS button
also acts as a pitch or roll sync switch. If the
airplane is in a pitch hold mode (PIT), de-
pressing the button synchronizes the com-
mand bars to the existing pitch attitude. If
SPD, VS or ALT vertical modes are engaged,
they will sync to the existing values when the
TCS button is depressed and released. The
SPD bug will also synch to the current airspeed
when the TCS button is momentarily depressed
while in the basic pitch mode (with a lateral
mode).
L E A R J E T 4 5
P I L O T T R A I N I N G M A N U A L
16-82
FOR TRAINING PURPOSES ONLY
FlightSafety
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