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NAV (navigation) button — Pressing the NAV button alternately selects and deselects the navigation mode. The NAV
mode normally intercepts route segments identified with VOR radials and intercepts and flies desired FMS tracks.
HDG button and knob— Pressing the HDG button engages the heading mode and displays a green HDG annunciation
on the PFDs. The heading button controls the heading bug and digital display. Pressing the push button in the center of the
HDG knob synchronizes the HDG bug on all display units to the aircraft current heading. The flight director command bars
command a turn in the direction the heading bug was moved to achieve the set heading.
APPR (approach) button — The APPR mode is used for all approaches, regardless of NAV source or whether a vertical
mode is also associated with the approach. Pressing the APPR button arms both localizer and glideslope modes and
is normally used to select lateral and vertical steering for ILS and FMS. The VOR approach mode is selected by pressing
the APPR mode button with the navigation receiver tuned to a VOR frequency and selected as the active nav source. When
the navigation receiver is tuned to an ILS frequency, ILS is selected as the active navigation source. Selection of APPR
mode when the NAV source is FMS engages the FMS lateral mode the same as described for NAV, and also arms VNAV
for approach.
B/C button — The back course button is used to alternately select and deselect the back course mode for flying a localizer
back course approach.
1/2 BANK button — Pressing this button alternately selects or deselects a reduced maximum bank angle of 15° (for all
lateral modes, except roll) on both FDs. When selected, a green 1/2 bank arc appears on the top of the attitude direction
indicators.
FLC (flight level change) button — Depressing the FLC button engages the flight level change mode, which sycronizes
on engagement to the current airspeed/mach. The speed reference can then be changed with the SPEED knob. Pushing the
FLC switch again disengages the mode.
CRS HDG SPEED
DOWN
UP
ALT AP/YD DISC CRS
FD NAV
1/2 BANK
HDG APPR
B/C
FLC VS
VNAV
ALT AP
XFR
YD FD
CFO0401002_ 001
DIRECT
SYNC
CANCEL
PUSH
PUSH
PUSH
PUSH
DIRECT
IAS/MACH
PUSH
S/1
AUTOMATIC FLIGHT CONTROL SYSTEM
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 04-01-05
FLIGHT GUIDANCE PANEL (FGP) (Cont)
SPEED knob — The rotary SPEED knob changes the IAS/Mach speed reference (FLC mode). The speed knob changes
the bug airspeed or Mach at any time. The integral PUSH IAS/MACH button within the SPEED knob toggles the airspeed
tape between IAS and Mach. The master flight director computes the airspeed reference, and the slave flight director synchronizes
to this reference.
VS button — The VS switch selects vertical speed mode. When activated, the system maintains the vertical speed reference.
The vertical speed reference is set to the current vertical speed at the time of mode selection. After mode selection,
rotation of the DOWN/UP wheel slews the vertical speed reference in the direction of knob rotation. Range is ±8000 fpm.
VNAV (vertical navigation) button — Pressing the VNAV button arms and then captures the FMS pitch steering commands
of the FDs if FMS is selected as the NAV source, the FMS is programmed for a vertical navigation profile, the altitude
preselector is set below existing altitude, and the aircraft is within the TOD (top of descent) window or above the
existing altitude for VNAV climb (i.e. VFLC).
ALT (altitude hold) button — Altitude hold may be engaged by depressing the ALT button on the FGP. When
ALT engages, the FD holds the existing altitude at the time the ALT button was pushed except during a precision approach
with the glideslope captured.
ALT (altitude select) knob — A preselected altitude is set via the ALT rotary knob. The altitude preselect mode provides
a means for FD/AP to climb or descend to a preselected altitude and then level off and maintain the preselected altitude. If
an altitude deviation (±200 ft) has occurred, the altitude preselect digits will turn amber and flash, press the PUSH CANCEL
button in the center of the ALT knob to cancel the flashing. The digits will then revert to cyan.
AP (autopilot) button — Pressing this button engages the autopilot. Pressing a second time disengages the autopilot.
YD (yaw damper) button — Pressing this button engages yaw damper. The YD can be engaged independently of
the autopilot, but the autopilot system does not engage without the YD.
XFR (transfer) button — Selects the desired flight director (left or right) to command the autopilot.
　
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