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the ALTSEL CAP mode is automatically cancelled and the system switches
to the ALT hold mode. If the air data computer is not valid, the
altitude preselect mode cannot be selected.
(16) VNAV Mode
After the VNAV mode data (preselected altitude, distance and vertical
angle) is set in the VNAV computer/controller (refer to paragraph H,
VNAV Computer/Controller), the VNAV mode is selected by pressing the
VNAV switch/light on the flight director mode selector. If a preset
angle was established, the system arms with VNAV ARM annunciated.
Upon reaching the selected vertical angle, the system automatically
switches to VNAV capture. The ADI command cue indicates a fly-to
condition to smoothly capture and track the vertical path to the
preselected altitude. Just prior to reaching the preselected
altitude, the system reverts to the ALT hold mode.
(17) Go-Around Mode (Figure 14)
The go-around mode is selected by pressing the remote go-around switch
on the throttle actuating lever. When the mode is selected, all other
modes are reset and the go-around (GA) annunciator on the ADI comes
on. The ADI command cue receives the go-around command which is a
fixed pitch up attitude command. Once go-around is selected, any roll
mode can be selected cancelling the wings level command. The
go-around mode is cancelled by selecting another pitch mode or touch
control steering.
(18) Touch Control Steering
The touch control steering (TCS) is selected on the control wheel.
With the autopilot engaged and lateral or vertical mode selected on
the flight director mode selector, operation of the TCS button allows
manual manoeuvering of the aircraft in roll or pitch. When the TCS
button is released, the existing roll and pitch attitudes are
maintained.
SECTION 4
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Oct 03/83
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OPERATING MANUAL
Use of TCS during glideslope control or during ALTSEL CAP permits
manoeuvering while the TCS button is pressed. However, when TCS
button is released, normal glideslope control or ALTSEL control is
resumed.
If the TCS button is released at bank angles of less than 6 degrees,
the aircraft returns to wings level.
B. Autopilot Controller (Figure 15)
The autopilot and flight director are fully integrated in operation and
mode selection. Autopilot operation is controlled by the autopilot
controller.
(1) Yaw Damper Engage
The YD ENGAGE switch/light engages the yaw damper. The yaw damper
provides dutch roll damping and turn coordination throughout the
flight regime. It engages automatically when the autopilot is engaged.
(2) Autopilot Engage
The autopilot may be engaged in any reasonable attitude by pressing
the AP ENGAGE switch/light. If there are no modes selected on the
flight director mode selector, pitch attitude is maintained and the
aircraft is rolled to wings level, at which time the aircraft heading
is held.
If any flight director lateral mode or vertical path mode is selected
prior to autopilot engagement, the autopilot is automatically coupled
to the selected flight director mode. Selection of a lateral mode or
a vertical path mode after the autopilot is engaged also automatically
couples the autopilot to the selected mode.
(3) Turn Knob
Operation of the turn knob provides bank commands to the autopilot
proportional to turn knob displacement. When the turn knob is
operated, the lateral mode selected on the flight director mode
selector is automatically cancelled. When the turn knob is returned
to the detent position, a lateral mode can be reselected. The
autopilot cannot be engaged if the turn knob is out of detent.
(4) Pitch Hold
When the autopilot is engaged and a vertical path mode is not
selected, the aircraft pitch attitude is maintained. Movement of the
pitch wheel on the autopilot (AP) controller changes the pitch
attitude. If a vertical path mode is selected, the pitch hold is
automatically cancelled. Movement of the pitch wheel when the
autopilot is in a vertical path mode automatically cancels the
vertical path mode. Movement of the pitch wheel with the autopilot
coupled to the glideslope has no effect.
SECTION 4
Page 38
Oct 03/83
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chauenqer
OPERATING MANUAL
GO-AROUND SWITCHES
Disengage tr» autoc*ot
Throttle Actuating Lever
Figure 14
SECTION 4
Page 39
Oct 03/83
cacnhaatiiiaeinr Qor
OPERATING MANUAL
COUPLE SWITCH/LIGHT
When pressed, selects which flight director is controlling the
autopilot.
The split legend, I and 2, sequences each time the
switch/light is pressed.
PITCH WHEEL
　
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