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Altitude preselect mode is armed upon selection. The capture point is a function
of closure rate, with the capture point moving away from the preselected altitude
for high closure rates.
Vol. 1 03--20--14
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
During altitude capture (within 200 ft of the preselect altitude), if the preselected
altitude is changed or if the VS pitch wheel is rotated, the autopilot or flight
director will continue to capture the original preselected altitude.
If a new preselect altitude is not set, then selection of IAS, MACH, PTCH or VS
mode, will result in the current altitude being captured.
After capturing preselected altitude (altitude track), if preselect altitude is
changed, altitude hold is automatically selected and altitude preselect rearmed.
Pushing in the ALT knob will cancel aural and visual alerts associated with the
preselected altitude.
Altitude preselect mode is automatically selected upon selection of any vertical
mode, except glideslope capture or overspeed. Altitude preselect mode is
cleared by glideslope capture or overspeed.
Altitude preselect is annunciated on the primary flight display with a white ALTS
message in the vertical arm field for arm; a green ALTS CAP message in the
vertical capture field for capture, and a green ALTS message in the vertical
capture field for track. Altitude captures, which are cleared without a subsequent
selection of altitude track or arm, are annunciated with a yellow ALTS message on
the primary flight display, which will remain for 10 seconds, or until altitude
preselect is rearmed, whichever is shorter.
(5) Speed Mode (CLB, DES, IAS)
Speed mode generates commands to maintain the airspeed reference value.
When speed mode is selected, the IAS reference (primary flight display) is set to
the current airspeed.
The airspeed reference can be manually set, using the speed knob. The airspeed
reference is reset to current airspeed by the selection of autopilot engagement or
synchronization.
Upon altitude capture, (selected altitude), speed mode is disabled.
Speed mode is displayed in either IAS CLB or DES. Selection of the speed
readout is accomplished by pushing the SPEED knob on the flight control panel.
In DES mode, if a large reduction in target airspeed is commanded with
simultaneous spoiler deployment, the autopilot may enter a Pitch Hold
sub---mode (no annuciation of Pitch Hold sub---mode is provided). Pitch Hold
sub---mode was designed to maintain a constant pitch attitude as a means of
decelerating to the new target airspeed without sacrificing rate of decent or
passenger comfort. The only indication that the autopilot has entered Pitch Hold
sub---mode is that the airspeed is not decreasing and stays well above the target
airspeed. In DES mode, if the airspeed is not decreasing, the Pilot can either
disconnect the autopilot and assume manual control, or select another vertical
mode such as VS or PTCH and adjust the vertical speed or pitch as required to
resume deceleration to the target airspeed.
Vol. 1 03--20--15
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
(6) Vertical Speed Mode
Vertical speed mode generates commands to maintain the VS reference value.
When vertical speed mode is selected, the VS reference (primary flight display) is
set to the current vertical speed.
The VS reference value can be changed, throughout a ±12,000 feet/minute range,
using the VS pitch wheel on the flight control panel. The VS reference is reset to
the current vertical speed by the selection of autopilot engagement or
synchronization.
When capturing or tracking a preselected altitude, a new preselected altitude
must be chosen prior to selection of vertical speed mode, to avoid an immediate
recapture of existing preselected altitude.
Vertical speed mode is manually selected by pushing the VS switch on the flight
control panel. Selection is inhibited when in glideslope capture or overspeed.
Vertical speed mode is cleared by pushing the VS switch again, by selecting a
vertical hold mode, or by a vertical mode capture.
Vertical speed mode is annunciated with a green VS #.# ↑ or VS #.# ↓ in the
vertical capture field on the primary flight display. The #.# is the VS reference
value, in thousands of feet/minute (values over 10,000 feet/minute are displayed
without a decimal point). The up arrow displays a positive reference and the
down arrow displays a negative reference.
The flight control computer operates in the active mode. Capture will not occur if
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