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command bars on the attitude director indicator (ADI) of the PFD. The pilot can
manually fly the aircraft by following the command bar guidance cues. When
autopilot is engaged, the FCCs issue steering commands to the aileron and elevator
servos according to the flight director guidance instructions.
Operation
Flight Director Selection
There are two independent flight directors for each AFCS channel (AFCS 1 and
AFCS 2). FCC 1 of AFCS 1 and 2 is designated as FD 1 and FCC 2 of AFCS 1 and 2
is designated as 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 annunciations and command cues displayed on the pilot’s and
copilot’s 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 FD mode. 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 copilot’s PFD also displays a green FD 1 annunciation below the
left arrow to indicate that copilot’s FD commands are being supplied by FD 1 (Figure
4-8).
Flight Director Couple Arrow
Figure 4-8
P604_04_035
PILOT PFD COPILOT PFD
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AUTOMATIC FLIGHT CONTROL SYSTEM
For Training Purposes Only
May 03
4-13
P I LOT T R A I N I N G GU I D E
When the autopilot is engaged with FD 1 active, a green AP annunciation is displayed
on both PFDs over the left-pointing FD arrow (Figure 4-9).
When the pilot has control of the aircraft, FD 1 is normally selected and all flight
guidance commands are derived using the pilot’s side systems (ADC 1, IRS 1, pilot’s
navigation source selection).
AP/FD Engagement
Figure 4-9
AP/FD Transfer (XFR) Mode
Pressing the XFR (transfer) button on the Flight Control Panel allows FD 2 to become
the active flight director. When FD 2 is active and the autopilot is disengaged, a white
right-pointing arrow is displayed on the upper left side of both PFDs. The pilot’s PFD
will also display a green FD2 annunciation below the arrow to indicate that the pilot’s
FD commands are being supplied by FD 2. In addition, the green status indicator lights
beside the XFR button illuminate to indicate that transfer mode is active.
When the autopilot is engaged and FD 2 is active, a green AP annunciation is
displayed on both PFDs over the right-pointing FD arrow (Figure 4-10).
When the copilot has control of the aircraft, XFR mode is normally selected. When
FD 2 is active, the flight guidance commands are derived using the copilot’s side
systems (ADC 2, IRS 2, copilot’s navigation source selection).
P604_04_058
7000 7000
10000 10000
10 10
10 10
MDA MDA
A A
A A
HDG HDG
A A
DR ALTS DR ALTS
A A
AP
FD1
AP
2500M 2500M
M.452 M.452
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240 240
220 220
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260 260
29.92 IN 29.92 IN
PILOT PFD COPILOT PFD
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AUTOMATIC FLIGHT CONTROL SYSTEM
4-14 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
AP/FD Transfer
Figure 4-10
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:
• takeoff mode
• go-around mode
• approach (APPR) mode
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 pilot’s channel supplies flight guidance
commands to the pilot’s flight director, and the copilot’s channel supplies flight
guidance commands to the copilot’s flight director.
In the above modes, the FD1 and FD2 annunciations are not displayed on the PFDs.
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