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(FGC), see Figure 5-18. The FD mode select buttons on the FGC panel
are momentary action and each has a vertical green bar that illuminates
whenever the mode is selected.
Pilot’s Manual
5-66 PM-126A
FLIGHT GUIDANCE CONTROLLER (FGC)
The Flight Guidance Controller (Figure 5-18) is the prime controller for
the flight director and the autopilot/yaw damper. Located on the center
glareshield, the FGC provides the means, via push button switches,
for flight director mode selection, couple status and autopilot/yaw
damper engage selection. Flight director modes engage status is indicated
to the crew via a green light on the right edge of each mode
switch, which is illuminated when the mode is active and extinguished
when the mode is inactive or dropped. The controller also has several
rotary controls enabling selection of IAS, MACH, and VS targets, altitude,
course and heading. All push button selections are signaled to
both IC-600s via a discrete output from the FGC. The IC-600s then provide
the drive to illuminate the appropriate light on the FGC.
The FGC annunciations and controls are as follows;
FD 1/2 buttons — The flight director buttons (FD 1 and FD 2) are located
on the upper left/right corners of the flight guidance controller. Depressing
these buttons alone will not bring the FD command bars into
view. Any FD mode selection causes the FD command bars to appear
on both PFDs. When the FD command bars are in view on both PFDs
and the autopilot is not engaged, depressing the master side FD button
will disengage all FD modes and remove the command bars from both
sides. Pressing the slave side FD button will remove the command bars
from the PFD on that side acting as a flight director clear function.With
the autopilot engaged, the FD command bars will be in view at all times
on the coupled side and cannot be removed from the PFD. The opposite
side FD command bars can be removed from view by depressing the
appropriate FD 1 or FD 2 button.
FLIGHT GUIDANCE CONTROLLER
Figure 5-18
Pilot’s Manual
PM-126A 5-67
Course set knobs — A course set knob (CRS 1 and CRS 2) is located at
each end of the FGC. These knobs are used to individually set the
courses on the left and right PFD HSI displays. They are used primarily
to set the course for a VOR radial or LOC course. The course knobs
have a push button in the center to synchronize the display to the aircraft’s
“direct-to” course.
Heading set knobs — Heading is selected via a rotary knob, with a
“Heading Bug” symbol on the face of the knob. The heading knob controls
the heading bug and digital display on both PFDs and the bug on
the MFD MAP display. Depressing the HDG knob will synchronize the
HDG bug on all display units to the aircraft’s current heading.
HDG (heading) button — Depressing the HDG button engages the
heading mode and displays a green HDG annunciation on the PFDs.
The flight director command bars will command a turn in the direction
the heading bug was moved to achieve the set heading. Heading select
is used to maintain a magnetic heading. The heading bug is positioned
to the desired heading on the HSI using the HDG knob on the FGC. The
heading select mode is canceled when any armed lateral mode captures
or if GA is selected.
NAV (navigation) button — Pressing the NAV button alternately selects
and deselects the navigation mode. The NAV mode is normally
used to intercept route segments identified with VOR radials and to intercept
and fly desired FMS tracks (SIDs, routes, holding and STARS).
APP (approach) button — The intended function of the APP mode is
that APP be used for all approaches, regardless of nav source or whether
a vertical mode is also associated with the approach. The APP mode
is normally used to select lateral and vertical steering for ILS and FMS.
The VOR approach mode is selected by pressing the APP mode button
with the navigation receiver tuned to a VOR frequency and selected as
the active nav source. Pressing the APP button arms both localizer and
glideslope modes when the navigation receiver is tuned to an ILS frequency
and ILS is selected as the active navigation source. Selection of
APP mode when the nav source is FMS engages the FMS lateral mode
the same as described for NAV and also arms VNAV for approach.
BNK (bank) button — Pressing this button alternately selects or deselects
a reduced maximum bank angle of 14° (for all lateral modes, except
roll) on both FDs. When selected, a green low bank arc appears on
the top of the ADIs and BNK is annunciated on the PFD.
　
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