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PSP 604−6
CONTROLS AND INDICATORS (CONT'D)
Preselect Altitude Warnings
Preselect altitude warnings provide aural and visual signals. The aural warning signal is a
one-second C-chord tone. After capture, the digital display flashes amber for minor altitude
deviations. The bug and numeric display both flash amber for major altitude deviations.
The air data computers use the preselected altitude data to initiate two different types of cues
and warnings. These cues and warnings are initiated when the difference between the
preselected and barometric altitude is greater than the programmed limits.
The programmed limits are:
• Minor deviation is ±200 feet
• Major deviation is ±1,000 feet
(See Chapter 4, Automatic Flight Control System, for additional altitude preselect tracking
information).
Preselect Altitude Cross-Side Tracking
Each ADC receives the preselected altitude via its on-side ADRP and the cross data bus. The
ADCs compare the preselected altitude values of the two computers. If the values are not
equal due to a bus failure, the digital preselect altitude indication changes from magenta to
cyan when the adjustment knob is turned. If full bus operation is recovered, the two sides will
synchronize to the value held by the coupled side ADC. The indication returns to magenta after
synchronization has been achieved.
MDA Display
The minimum descent altitude (MDA) is numerically displayed below the altitude scale. The
on-side ADRP is used to select this display and set the appropriate value. An MDA alert
displays near the left center of the ADI when the airplane is at the minimum descent altitude.
During the MDA alert, the icon flashes yellow.
MDA Pointer
A cyan pointer marks the selected minimum descent altitude on the fine barometric altitude
scale. This pointer appears when the MDA display is selected and the value is in the display
range. This pointer flashes during an MDA alert.
Decision Height Display
The decision height value is selected for display and set by the on-side ADRP. If this display is
selected, it is automatically displayed once the aircraft has descended through 2,500 feet
above ground. If decision height data becomes invalid, the numeric values are replaced with
red dashes.
A DH alert displays when the airplane is at or below decision height. On the right center of the
attitude indicator, DH flashes in yellow, accomplished by the voice alert “MINIMUMS”.
There is also a DH pointer which marks the selected decision height on the analog radio
altitude scale. This pointer appears when the DH display is selected, and the value is in the
display range.
FLIGHT INSTRUMENTS
Description
Vol. 2 11−10−25
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
CONTROLS AND INDICATORS (CONT'D)
MDA and DH Displays
Figure 11−10−15
Vertical Speed Display
The current vertical speed is shown by a green pointer on a vertical white scale; the green
pointers drags a green vertical line from the center of the scale. Vertical speed (when 200
feet/minute or greater) is numerically repeated at the bottom of the scale, followed by an arrow
pointing “up” for climb, or “down” for descent.
The vertical speed is selected by using the VS/pitch wheel on the FCP, and the magenta
numerical value is displayed at the top of the vertical speed scale, with a corresponding up or
down arrow, as selected.
The FMS vertical navigation computer continuously calculates vertical speed required to reach
the next point on the flight plan at the altitude required. The required vertical speed when
greater than 500 fpm for FMS VNAV is displayed on the vertical speed scale in the form of a
cyan circle.
NOTE
For Precision-Plus-equipped aircraft, the cyan circle will be
displayed if VNAV is selected or VNAV advisory enabled.
TCAS advisories display on the VS scale as green or red lines. A
green line shows a recommended “fly-to” range of vertical speeds.
A red line shows “avoidance” or “exit” vertical speeds. TCAS modes
and messages are also displayed below the VS scale as
appropriate (see Chapter 17, Navigation Systems, for further
details).
FLIGHT INSTRUMENTS
Description
Vol. 2 11−10−26
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
CONTROLS AND INDICATORS (CONT'D)
PFD Vertical Speed Display
Figure 11−10−16
FLIGHT INSTRUMENTS
Description
Vol. 2 11−10−27
REV 66, Feb 01/07
CL−604 Operating Manual
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