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altitude. The alert can be cancelled by pressing the altitude knob on the flight control
panel.
F. Cross Side Tracking
Each ADC compares the preselected altitude value from both computers for equality. If
the values are not equal, the preselected altitude digits on the display change from
magenta to cyan.
G. Deviation Mode
After the preselected altitude is captured, if the altitude deviates from the preselected
altitude by more than ±200 feet, a deviation alert warning (aural “C” chord) will be set
and the preselected altitude readout and bug will change from magenta to amber and
begin to flash. The readout and bug will return to normal once the altitude is back
within deviation limits. A deviation alert will also be made if the airplane has gone within
the acquisition limits on an altitude capture but then deviates by more than 100 feet
from the preselected altitude.
H. Low Speed Cue
The low speed cue provides an indication of the speed margin to stick shaker during
normal low speed maneuvers and approaches to stall. The top of the low speed cue
corresponds to the onset of the stick shaker.
NOTE
A high pitch rate at low airspeed may cause the stick
shaker airspeed to be higher than that indicated at the
top of the low speed cue. Respect the stick shaker
warning to ensure adequate margin to full stall.
Vol. 1 12--30--14
FLIGHT INSTRUMENTS
Air Data System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Vertical Speed Indication and Flag <1015>
Figure 12---30---10
Vertical Speed Flag (red)
Indicates that vertical speed
data has failed. Appears in
place of vertical speed scale,
pointer and readout.
Vertical Speed Scale (white)
Non--linear scale of vertical speed between
4,000 feet per minute.
Small ticks at 250 FPM.
Large ticks at 500 FPM.
Digits at 1,000, 2,000 and 4,000 FPM.
Vertical Speed Pointer (green)
Indicates vertical speed in feet per minute.
Vertical Speed Readout (green)
Indicates current vertical speed
from 0 to 15,000 FPM.
From 0 to 9,950 FPM, display is at 100 FPM.
Above 9,950 FPM, display is at 1,000 FPM.
If rate is greater than 10,000 FPM, decimal
point disappears.
Vertical speed pointer and readout turn
red when a TCAS resolution advisory
is issued and speed is not within
corrective limits (refer to Chapter 18).
NOTE
Vol. 1 12--30--15
FLIGHT INSTRUMENTS
Air Data System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
I. Air Data Reversion
Normally, each ADC provides data to the same side PFD. If one ADC should fail, the
other computer may be used to supply data to both PFDs. This is done by selecting the
AIR DATA knob, to the 1 or 2 position, on the Source Selector Panel.
Source Selector --- Air Data Panel
Figure 12---30---11
Source Selector Panel
Center Pedestal
AIR DATA
NORM -- Each air data computer
supplies data to the same side display.
1 -- Air data computer 1 supplies data
to both pilot and copilot displays.
An amber source message is
displayed on both PFDs.
2 -- Air data computer 2 supplies data
to both pilot and copilot displays.
An amber source message is
displayed on both PFDs.
Vol. 1 12--30--16
FLIGHT INSTRUMENTS
Air Data System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Air Data Flags --- Primary Flight Display <1015>
Figure 12---30---12
ADC 1 or 2 (amber)
Indicates that single air data computer
source has been selected.
ADC 1 -- Air data computer 1 selected.
ADC 2 -- Air data computer 2 selected.
J. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Air Data Computer
ADC 1 DC
ESSENTIAL 2
V3
ADC 2 DC BUS 2
H6
Vol. 1 12--40--1
FLIGHT INSTRUMENTS
Radio Altimeter System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
1. RADIO ALTIMETER SYSTEM
There are two radio altimeter (RAD ALT) systems installed on the aircraft. Each system
provides an accurate measurement of absolute altitude (height above terrain) from --20 to
2500 feet AGL. Radio altitude information is supplied from both radio altimeters to the
following: <1045>
S PFD’s
S Spoiler and Stabilizer control units (SSCUs)
S Enhanced ground proximity warning system (EGPWS) <2040>
S Traffic alert and collision avoidance system(TCAS)
The radio altimeter provides the pilot’s and copilot’s PFDs with the following:
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