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to fly to a selected airspeed or Mach number, and to provide limited
overspeed/underspeed protection during climbs and descents. When
speed select mode is active, a green IAS or Mach annunciation is displayed
in the captured vertical mode field on the PFDs.
FLC (Flight Level Change) button — Depressing the FLC button once
engages the normal climb/descent profile on both PFDs. Depressing it
a second time selects the high speed climb/descent schedule. A third
depression deselects the mode. The FD chooses between the climb and
descent schedule based upon the aircraft’s present altitude and preselected
target altitude. The FD annunciation on the PFD is FLC for the
normal profile and FLCH for the high-speed profile.
VS (Vertical Speed) button — Depressing the VS button engages the
vertical speed hold mode on both FDs. When VS is selected, the speed
bug disappears and reference goes to dashes. The FD commands pitch
changes to hold the vertical speed that existed at the time of engagement.
Once engaged, the vertical speed bug positions on the inner side
of the vertical speed scale and a digital readout appears above the vertical
speed indicator.
Pilot’s Manual
PM-132A 5-69
VNV (Vertical Navigation) button — Depressing the VNV button
arms, 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. When
the VNAV mode is armed, a white VNAV is annunciated on the PFDs
in the FD vertical mode annunciation field and will turn green upon
capture.
ASEL (Altitude Select) knob — The preselected altitude is set via the
ASEL rotary knob on the FGC. 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. The ASEL knob is
used to set the altitude preselect function, and also provides the altitude
reference for the altitude alerter function.
ALT (Altitude Hold) button — Altitude hold may be engaged by depressing
the ALT button on the FGC. When ALT is engaged, the FD
commands pitch to hold the existing altitude at the time the ALT button
was depressed, or at the ASEL reference altitude if ALT automatically
engages.
AUTOPILOT/YAW DAMPER
The autopilot is a single-channel autopilot which may be coupled to
either flight director. The autopilot function is contained within the #2
IC-600 located in the nose. The IC-600 will fly the aircraft based on the
selected control mode and guidance inputs from the coupled flight director,
via servo control of the elevator, aileron and rudder. When engaged,
the autopilot will also automatically command trim changes as
required to alleviate the aerodynamic loading on the elevator (pitch
trim), and will allow control surface commands to be entered via the
control wheel trim switches for the ailerons and elevator. There is also
a Touch Control Steering (TCS) feature which allows the cockpit crew
to manually maneuver the aircraft with the autopilot engaged when
the TCS switch is pressed. The autopilot provides aircraft control in response
to pitch and roll steering commands from either flight director.
The yaw damper software computes servo commands based on sensor
input data only. The yaw damper control software provides yaw rate
damping that holds rudder force to zero. The servo position reference
is synchronized to zero at engagement and is constantly washed out to
ensure that the steady-state rudder forces are zero. The yaw damper
can be engaged independent of the autopilot but the autopilot cannot
be engaged without the yaw damper.
Pilot’s Manual
5-70 PM-132A
AP/YD Annunciation
At the very top center section of the PFDs is an area dedicated to flight
director and autopilot annunciations. A horizontal arrow appears at
the top center of each PFD between the flight director vertical and lateral
mode annunciators. This arrow points left or right, as selected on
the FGC XFR switch, to indicate which flight director the autopilot will
couple to when engaged. It also indicates which flight director has priority.
Just below the arrow is a line reserved for autopilot and yaw
damper annunciation. A green AP and YD appear in this area when the
autopilot and/or the yaw damper is /are engaged.
Control Wheel Trim Switch
Manual primary pitch trim or roll trim commands are initiated by
pressing and holding of the arm switch and actuation of the control
wheel trim switch. Pressing and holding of the arm switch with control
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