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flight director modes. The Flight Mode Annunciator must always
be cross-checked to confirm current lateral and vertical FD mode
status.
FD Buttons
The FD buttons are used to turn on or turn off the flight directors. When autopilot is
not engaged, pressing the FD button associated with the active flight director will
remove the command bars, and vertical and lateral guidance information from both
PFDs. The inactive side FD button can be used to alternately display or remove the
flight director command bar from the associated PFD.
When autopilot is engaged, pressing the FD button on the coupled side has no effect.
Course Select Knob
The course select knobs are used to set the course arrow when navigating with a VOR
or localizer. CRS1, when rotated, changes the pilot’s selected course as displayed on
the left primary flight display. A course arrow and digital course readout on PFD 1
indicate the course setting. The button in the center of the knob (PUSH DIRECT
button), when pressed, causes the course pointer and digital readout to indicate a
“direct-to” course to the tuned VOR station.
The copilot’s course select knob operates in an identical manner.
NOTE
AUTOMATIC FLIGHT CONTROL SYSTEM
4-18 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
FD SYNCHRONIZATION (SYNC) SWITCH
An FD SYNC switch is located on the back outboard horn of the pilot’s and copilot’s
control wheel. The FD SYNC switch synchronizes the FD command bar reference
values to the values flown at the time of selection. 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.
While the FD SYNC switch is pressed, trimming the horizontal
stabilizer will not disengage the autopilot.
AP/FD Synchronization
Figure 4-14
NOTE
7000
12000 1.1
10
20
10
MDA
A A
A
HDG
LNV1
DR VS
ALTS
AP
SYNC
2500M 4
4
2
2
1
1
M.464
280
240
220
250
260
10
900
700
600
800
29.92 IN
P604_04_039
AUTOMATIC FLIGHT CONTROL SYSTEM
For Training Purposes Only
Sept 04
4-19
P I LOT T R A I N I N G GU I D E
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 a selected FCC fails, the autopilot will automatically disengage.
Selecting the XFR button on the FCP deselects the failed flight director and allows the
standby flight director to become active.
Selecting the other AFCS (1 or 2) enables the second pair of FCCs, and provides a
second fully functional pair of flight directors which allows the autopilot to be
reengaged.
FD Failure Indications
Figure 4-15
NOTE
7000
20000 1.0
10
10
FD
A
A
HDG
A
DR ALT
A
AP
2500M 4
4
2
2
1
1
M.454
280
240
220
250
260
10
100
200
900
800
000
29.92 IN
P604_04_063
AUTOMATIC FLIGHT CONTROL SYSTEM
4-20 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Flight Director Lateral Modes
There are eight flight director lateral modes (bold letters refer to the Flight Control
Panel button selections):
• Roll
• Heading Select (HDG)
• Half Bank (1/2 BANK)
• Navigation; FMS, VOR, LOC (NAV)
• Approach; FMS, VOR, LOC (APPR)
• Back Course (B/C)
• Takeoff
• Go-Around
Lateral modes are armed or activated by pushbuttons on the flight control panel or on
the thrust levers. In general, deselecting the active lateral mode is accomplished by reselecting
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