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Flight Crew Operating Manual
CSP C--013--067
Dead reckoning is provided during VOR station passage. When DME data is
available, dead reckoning region is where DME distance to the station is less than
0.6 nautical mile (DME). Without DME data, dead reckoning is based on a high
rate of VOR deviation.
Approach mode is selected by pushing the APPR switch on the flight control
panel. Approach mode is cleared by pushing the APPR switch again, by
selecting another lateral mode, or by changing the source of the on-side
navigation signal.
Approach mode arming is annunciated with two messages on the primary flight
display, a green HDG message in the lateral capture field, and a white navigation
source identifier (VOR1/2, LOC1/2 or FMS1/2) in the lateral arm field. Approach
mode capture/tracking is annunciated with a green message in the lateral capture
field on the primary flight display which identifies the navigation source (VOR1/2,
LOC1/2 or FMS1/2). Dead reckoning operation is annunciated with a white DR
message on the primary flight display.
E. Vertical Mode of Operation
(1) Vertical Take-Off Mode
Vertical take-off mode generates a variable fixed pitch-up command dependant
on flap setting for takeoff and the spread between V2 and Vr. Loss of an engine
reduces the pitch-up command.
Selecting vertical mode turns on both flight directors, disengages the autopilot,
clears all other vertical modes and switches the flight guidance commands to a
dual independent configuration. Lateral and vertical take-off mode selections are
coincident.
When take-off causes an autopilot disengagement, the resultant warning may be
cancelled by another push of a TOGA switch, or by pushing the autopilot
disconnect switch.
Vertical take-off mode is selected by pushing one of the thrust lever-mounted
TOGA switches while on the ground. Vertical take-off mode is cleared by
engaging the autopilot, by selecting synchronization, or by the selection or
capture of another active mode.
Vertical take-off mode is annunciated with a green TO message in the vertical
capture field on the primary flight display.
(2) Pitch Mode
When pitch mode is selected, the pitch reference (pitch command on the primary
flight display) is set to the current pitch angle. Pitch mode generates commands
to maintain the pitch reference value.
Vol. 1 03--20--13
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
The pitch reference value can be changed using the VS pitch wheel. Rotation of
the VS pitch wheel will change the pitch reference by 1/2 degree per click. The
pitch reference is reset to the current pitch attitude upon either autopilot
engagement, transferring to pitch mode, or synchronization.
When the preselected altitude is captured, rotating the VS pitch wheel also
rearms the altitude preselect mode.
When capturing or tracking a preselected altitude, a new preselected altitude
must be chosen prior to the selection of pitch mode, to avoid an immediate
recapture of the existing preselected altitude.
Pitch mode is automatically selected when no other vertical mode is active, and
the flight director is on. Rotating the VS pitch wheel on the flight control panel will
manually select pitch mode when the flight director is on, unless in glideslope
capture or VS mode. Pitch mode is cleared by the selection of a vertical hold
mode, or by a vertical mode capture.
Pitch mode is annunciated with a green PTCH message in the vertical capture
field on the primary flight display.
(3) Altitude Hold Mode
Altitude hold mode generates commands to capture and maintain the altitude
reference. When altitude hold mode is selected, the altitude reference is set to
the current pressure altitude.
The altitude reference is reset to current pressure altitude by selection of
synchronization. There is no display of altitude reference value.
Altitude hold mode is selected by pushing the ALT switch on the flight control
panel, or by changing the altitude preselect setting while in altitude preselected
track. Selection is inhibited when in glideslope capture or overspeed.
Altitude hold mode is cleared by pushing the ALT switch again, by selection of a
vertical hold mode, or by vertical mode capture.
Altitude hold mode is annunciated with a green ALT message in the vertical
capture field on the primary flight display.
(4) Altitude Preselect Mode
Altitude preselect mode generates commands to capture and track preselected
altitudes. The barometric preselected altitude is displayed on the primary flight
display, and controlled via the ALT knob on the flight control panel.
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