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PILOT'S MACH/AIRSPEED INDICATOR
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INSTRUMENT REMOTE CONTROLLER
INSTRUMENT COMPARATOR AUTOPILOT CONTROLLER
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AUTOPILOT STATUS PANEL (2)
AFCS Flight Compartment Controls
and Indicators
Figure 1
SECTION 4
Page 3/4
Oct 03/83
canactair
chauencier
OPERATING MANUAL
Yaw Damping
The dual channel yaw damper performs two functions, yaw damping and turn
coordination. Yaw damping improves aircraft longitudinal stability by
damping oscillations in the yaw axis, which if not corrected, would induce
dutch roll. Inputs are provided to the rudder for turn coordination
throughout the turn. Dual channel operation provides greater yaw damping
and a fail passive capability which disengages a failed channel and reverts
to single channel operation without aircraft deviation from the selected
flight path.
The yaw damper is automatically engaged when the autopilot is engaged. It
can also be engaged by pressing the YD ENGAGE switch/light on the autopilot
controller. Either channel can be switched off prior to engaging by
pressing the YAW 1 OFF or YAW 2 OFF switch/light on the autopilot status
panel. Single channel operation cannot be selected with the yaw damper
engaged.
When a failure occurs in either channel and the monitoring circuits can
determine which channel has failed, the actuator in the failed channel is
driven to the middle of its travel range and a brake applied; the amber YD
INOP segment of the YD INOP/YD FAIL switch/light on the stability
augmentation control panel comes on; the MASTER/CAUTION PRESS TO RESET
switch/light flashes; the FLT CONT light on the master caution system
annunciator panel and the YAW 1 OFF or YAW 2 OFF switch/light on the
autopilot status panel come on. The YD ENGAGE switch/light on the
autopilot controller remains on green. The MASTER/CAUTION PRESS TO RESET,
FLT CONT and YD INOP lights can be reset by pressing the MASTER/CAUTION
PRESS TO RESET switch/light and YD INOP switch/light.
When a failure occurs in either channel and the monitoring circuits cannot
determine which channel has failed, the red YD FAIL segment of the
YD INOP/YD FAIL switch/light on the stability augmentation control panel
flashes; the AFCS disengage lights on the pilot's and copilot's instrument
panels flash red; the YD ENGAGE switch/light on the autopilot controller
remains on green; and YAW 1/OFF and YAW 2 OFF switch/lights on the
autopilot status panel flash amber. The red YD FAIL and AFCS disengage
lights can only be reset by disengaging the yaw damper. Each channel is
then individually engaged to determine the failed channel.
Mach Trim
Mach trim is a full-time operational system when the autopilot is not
engaged. Mach trim is controlled by the MACH TRIM TEST/ON/OFF switch on
the stability augmentation control panel which provides for test, normal
and manual modes. If a failure of the Mach trim system occurs, backup is
provided by the automatic pitch trim system of the autopilot. The Mach
trim disengages if Mach hold is flown with the autopilot engaged (refer to
paragraph 9, SYSTEM CONTROLS). The Mach trim automatically compensates for
the pitch down attitude that occurs as the aircraft Mach number increases.
SECTION 4
Page 5
Oct 03/83
canadair
chauencjer
OPERATING MANUAL
MACH TRIM INOP SWITCH/LIGHT
Amber MACH TRIM INOP light comes on if
Mach trim fails. When pressed, Mach trim is
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