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AUTOMATIC FLIGHT CONTROL SYSTEM Description Vol. 2 04.10.10
Oct 05/06
Flight Director Command Bar Figure 04.10.7
Flight Director Selection
There are two independent flight directors for each AFCS channel. They are designated as per the following table:
Flight Director Designation
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 in the FMA area of both PFDs. The right PFD also displays a green FD 1 annunciation below and to the left of the FMA area, to indicate that right side FD commands are being supplied by FD 1.
AUTOMATIC FLIGHT CONTROL SYSTEM Description Vol. 2 04.10.11
Oct 05/06
Flight Director Couple Arrow Figure 04.10.8
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 04.10.9
AP/FD Transfer (XFR) Mode
Selecting XFR 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
Oct 05/06
AP/FD Transfer Figure 04.10.10
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:
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Takeoff mode;
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Go-around mode; and
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Approach (APPR) mode.
AUTOMATIC FLIGHT CONTROL SYSTEM Description Vol. 2 04.10.13
Oct 05/06
When operating independently, the coupled side channel supplies steering commands to the 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.
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