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The cyan preselect altitude readout is displayed above the altitude tape and has a selection range of -1000 feet to 45 000 feet in increments of 100 feet.
The range of the metric preselect altitude is from -300 meters to 17 000 meters.
ALTITUDE ALERT MODES
The altitude alert functions in the acquisition, deviation, and tracking modes.
The preselect altitude bug will change color and flash when the altitude acquisition and deviation parameters are exceeded.
Aural alerts accompany the visual alerts for acquisition and deviation modes.
Pressing the ALT knob will cancel an altitude alert if active.
ACQUISITION MODE
Both preselect altitude bugs flash cyan and an aural “C-chord” tone is heard when the aircraft altitude is 1000 feet above or below the preselected altitude.
DEVIATION MODE
When an altitude deviation of 200 feet or more above or below the selected altitude occurs, both preselect indicators flash amber and the “C-chord” tone is heard.
TRACKING
Monitoring of the preselected altitude tracking is a function of the ADCs.
VERTICAL NAVIGATION
When vertical navigation is selected (VNAV), the following are displayed:
-FMS reference altitude
-Vertical deviation and scale
-Suggested vertical speed (circular bug)
VERTICAL SPEED FIELD
The vertical speed (VS) display consists of a vertical analog scale and pointer with a green “drag line”. A part-time digital readout of the vertical speed is also provided. The VS pointer moves up and down the scale to indicate current VS. As the pointer moves, the drag line appears to emphasize the VS.
The vertical speed scale has a range of ± 4000 fpm. A part-time digital readout of the vertical speed is displayed on either the top or bottom of the vertical speed scale respective of climb or descent.
Selected VS shows on the VS scale as a reference bug, and as a digital readout on the automatic flight control system (AFCS) mode field above the attitude ball.
Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
11-01-09 PRIMARY FLIGHT DISPLAYS (Cont) VERTICAL SPEED FIELD (Cont)
Selected VS only shows when the AFCS VS mode is active and the UP/DOWN wheel on the flight guidance panel is used to set the selected VS. When VS mode is selected, the VS readout in the AFCS mode field appears. It is preceded by a VS bug icon, and followed by an arrow. The readout, icon, and arrow remain in view as long as the VS mode is active. The VS
bug and display in the AFCS mode field show in cyan when commanded by the UP/DOWN wheel on the FGP. The readout icon and bug are magenta when the FMS is in control.
The vertical speed scale is also used to display TCAS advisory deviations. The FMS vertical speed required (VSR) advisory pointer is a magenta open circle, that indicates the minimum average VS required to climb or descend from the present position to the next climb (or descend) altitude constraint. The FMS must be the active NAV source for the pointer to be displayed.
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