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mode, except glideslope capture or overspeed. Altitude preselect mode is
cleared by glideslope capture or overspeed.
Altitude preselect is annunciated on the PFD 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 PFD, which will
remain for 10 seconds, or until altitude preselect is rearmed, whichever is shorter.
(4) 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.
When altitude hold mode is selected by the flight management system, the
altitude reference is a barometric value from the VNAV, which is converted to
pressure altitude upon completion of capture.
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. In VNAV mode, altitude hold can be selected by the flight management
system. 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.
(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 FD SYNC or AP
engagement.
Upon altitude capture, (selected altitude), speed mode is disabled.
Vol. 1 03--20--15
REV 56, Jan 31/03
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance
Flight Crew Operating Manual
CSP A--013
MASTER
Speed mode is displayed in either IAS or MACH. Selection of the speed readout
is accomplished by pushing the SPEED knob on the flight control panel.
(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 FD SYNC or AP
engagement.
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 FCC operates in the active mode. Capture will not occur if the localizer is not
captured, or if the FCC is not receiving valid glideslope data. Upon glideslope
capture, other vertical modes are automatically cleared on the captured side. If
the other side does not concurrently capture the glideslope, it will continue to
operate in the current active vertical mode, or ensuing vertical mode, until it
independently captures glideslope.
Climb or descent rate is achieved by moving the rotary wheel on the flight control
panel.
(7) Glideslope Mode
Glideslope mode will generate commands to capture and track the glideslope.
Captures can be performed from above or below the localizer beam.
The capture point is a function of closure rate, with the capture point moving
away from the beam for high closure rates. Capture will always occur if deviation
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