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autopilot, and dual independent flight guidance computations are supplied to the flight directors
(“split” flight directors). The left channel supplies flight guidance commands to the left flight
director, and the right channel supplies flight guidance commands to the right flight director.
In the above modes, the FD1 and FD2 annunciations are not displayed on the PFDs.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−13
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FLIGHT DIRECTORS (CONT'D)
Independent "Split" FD Mode
Figure 04−10−12
Flight Mode Annunciator (FMA)
Lateral and vertical FD modes are presented in the flight mode annunciator (FMA) displayed on
each PFD. The FMA is located above the PFD ADI display.
The FMA is divided into two fields, separated by vertical cyan lines. The left field displays the
lateral flight director modes.The right field displays the vertical FD modes. Each field has two
lines, the top indicates the active or captured mode (green), the bottom line indicates the armed
modes (white). Certain conditions will trigger the use of yellow, and will be explained under each
mode.
FMA Active/Captured Mode Display
The active/captured lateral and vertical modes are displayed in steady green text. Lateral and
vertical modes that are capturing are displayed in flashing green text for five seconds, then
change to steady green text.
If the active lateral or vertical mode becomes invalid (sensor data), the flight control system
removes the invalid steering commands from the affected flight director. A red horizontal line is
superimposed over the affected active mode annunciation (e.g ).
FMA Armed Mode Display
The armed lateral and vertical modes are normally displayed in steady white text in the lower
portion of the lateral or vertical field. Up to two vertical modes may be armed simultaneously.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−14
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FLIGHT DIRECTORS (CONT'D)
Flight Mode Annunciator (FMA)
Figure 04−10−13
FD Activation
There are three methods to activate the flight director:
• Selecting a lateral or vertical mode on the flight control panel
• Engaging autopilot
• Pushing takeoff/go-around (TOGA) switches
FD Deactivation
The flight director is deactivated with the FD button on the FCP.
When the autopilot is not engaged, pressing the FD button on the offside will deactivate the
offside flight director only. Pressing the onside FD button disengages both flight directors.
When the autopilot is engaged, pressing the FD button on the offside will deactivate the offside
flight director only. Pressing the onside FD button has no effect.
The FD button is inhibited during an overspeed condition.
FD Synchronization
The FD SYNC switch synchronizes the FD command bar reference values to the values flown at
the time of selection. The FD SYNC switch is located on the back outboard horn of the pilot’s
and copilot’s control wheel.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−15
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FLIGHT DIRECTORS (CONT'D)
The following flight director modes can be synchronized to the current aircraft conditions when
the FD SYNC switch is depressed:
• FLC (indicated airspeed/Mach)
• VS (vertical speed)
• ALT (barometric altitude hold)
• PTCH (pitch angle)
• ROLL (roll angle)
When any flight director mode listed above is active, pressing the FD SYNC switch causes a
yellow SYNC message to appear on both PFDs. The SYNC message will be removed when the
FD SYNC switch is released.
Pressing the FD SYNC switch while the autopilot is engaged releases the aileron and elevator
servo clutches, which allows the flight crew to manually fly the airplane without disengaging the
autopilot. The AP engage annunciation will also appear in yellow whenever the FD SYNC switch
is being pressed with the autopilot engaged.
NOTE
While the FD SYNC switch is pressed, trimming the horizontal
stabilizer will not disengage the autopilot.
AP/FD Synchronization
Figure 04−10−14
FD Failure
If the active flight director fails, the flight director command bars are removed from both PFDs
and replaced by a red boxed FD annunciation. An FD 1 (2) FAIL status EICAS message may
also be displayed.
If the active FD fails, selecting the XFR button on the FCP deselects the failed flight director and
　
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