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kts, only one yaw damper will be active.
Yaw Damper Disengagement
The DISC button on the YAW DAMPER panel disengages both yaw damper channels when
pressed. When both yaw damper channels are disengaged, an amber YD annunciation is
displayed on the upper left side of the PFDs, and a YAW DAMPER caution EICAS message
appears.
A single disengaged (or inoperative) yaw damper channel is indicated by a YD 1 (2) INOP status
EICAS message.
Yaw Damper Panel
Figure 04−10−6
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−9
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
YAW DAMPER SYSTEM (CONT'D)
Yaw Damper Disengaged Annunciation
Figure 04−10−7
FLIGHT DIRECTORS
Description
The flight directors (FDs) are the visual representation of the commands generated by the flight
control computers.
Operation
Flight Director Command Bars
The flight directors provide integrated pitch and roll guidance by means of magenta inverted
V-shaped command bars on the ADI of the PFD.
The command bars are always in view when the flight director is being used or when the
autopilot is engaged. The command bars are out of view when the flight director is turned off or
flagged, or when the aircraft’s attitude is extreme.
The pilot can manually fly the aircraft by following the command bar guidance cues. When the
autopilot is engaged, the FCCs issue steering commands to the aileron and elevator servos
according to the flight director guidance instructions.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−10
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FLIGHT DIRECTORS (CONT'D)
Flight Director Command Bar
Figure 04−10−8
Flight Director Selection
There are two independent flight directors for each AFCS channel. They are designated as per
the following table:
Flight Director Designation
AFCS CHANNEL LEFT SIDE FCC RIGHT SIDE FCC
1 FD 1 FD 2
2 FD 1 FD 2
In most flight director modes, only one FD provides guidance commands and flight mode
annunciations to both PFDs. The other FD operates as a standby. This ensures that all FD
mode annunciation and command cues displayed on the left and right PFD remain
synchronized.
At power-up, both flight directors are off. FD 1 defaults as the active flight director, following
selection of any lateral or vertical mode on the FCP. When FD 1 is active and the autopilot is
disengaged, a white left−pointing arrow is displayed on the upper left side of both PFDs. The
right PFD also displays a green FD 1 annunciation below the left arrow to indicate that right side
FD commands are being supplied by FD 1.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−11
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FLIGHT DIRECTORS (CONT'D)
Flight Director Couple Arrow
Figure 04−10−9
When the autopilot is engaged with FD 1 active, a green AP annunciation is displayed on both
PFDs over the left-pointing FD arrow.
When the left-seated pilot has control of the aircraft, FD 1 is normally selected and all flight
guidance commands are derived using the left side systems (ADC 1, IRS 1, left side navigation
source selection).
AP/FD Engagement
Figure 04−10−10
AP/FD Transfer (XFR) Mode
Selecting XFR (transfer) on the flight control panel transfers to the cross-side active FD. It
determines which FD guidance the autopilot will follow when engaged. The following table
illustrates the PFD display based upon XFR switch selection.
In addition, the green status indicator lights beside the XFR button illuminate to indicate that
transfer mode is active.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−12
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FLIGHT DIRECTORS (CONT'D)
XFR Mode PFD Displays
AUTOPILOT DISENGAGED AUTOPILOT ENGAGED
XFR Left Side Right Side Left Side Right Side
OFF ← ←
FD1
AP
←
AP
←
FD1
ON →
FD2 →
AP
→
FD2
AP
→
AP/FD Transfer
Figure 04−10−11
Dual Independent FD Operation
Both FDs become active and supply independent flight guidance commands to their
associated PFD (dual independent operation) when in the following flight director modes:
• Takeoff mode
• Go-around mode
• Approach (APPR) mode
When operating independently, the coupled side channel supplies steering commands to the
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庞巴迪挑战者604操作手册 Operating Manual 3(39)
