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Indicates altitude data has failed.
Appears in place of altitude tape.
Altitude Indicator
700
800
900
000
100
NEG
Negative Altitude
Flag (yellow)
Appears at altitudes
less than 0 feet.
<0015>
Vol. 1 12--30--13
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Air Data System
Flight Crew Operating Manual
CSP A--013
MASTER
E. Acquisition Mode
Altitude alerts are inhibited in approach mode, when glideslope is captured and there
are valid autopilot steering commands. The ADC will set a one second acquisition alert
warning (altitude C-cord warning aural) and flash the preselected altitude readout when
the present altitude is within ±1,000 feet of capturing the preselected altitude. The
readout will stop flashing when the altitude is within ±200 feet of the preselected
altitude. The alert can be cancelled by pressing the altitude knob on the flight control
panel.
F. Cross Side Tracking
Each ADC compares the preselect altitude value from both computers for equality. If
the values are not equal, the preselect 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. 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.
REV 56, Jan 31/03
Vol. 1 12--30--14
FLIGHT INSTRUMENTS
Air Data System
Flight Crew Operating Manual MASTER
CSP A--013
Minimum Descent Altitude Indications <MST>
Figure 12---30---9
Minimum Descent Altitude Alert (amber)
Indicates that airplane has arrived at
minimum descent altitude.
Minimum Descent Altitude Pointer (cyan)
Indicates MDA, as set on the air data
reference panel.
Disappears when out of range.
Flashes during MDA alert.
Minimum Descent Altitude Readout (cyan)
Indicates MDA as set on the air data
reference panel.
<0015>
Vol. 1 12--30--15
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Air Data System
Flight Crew Operating Manual
CSP A--013
MASTER
Vertical Speed Indication and Flag <MST>
Figure 12---30---10
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 Flag (red)
Indicates that vertical speed
data has failed. Appears in
place of vertical speed scale,
pointer and readout.
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.
NOTE
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).
<0015>
REV 56, Jan 31/03
Vol. 1 12--30--16
FLIGHT INSTRUMENTS
Air Data System
Flight Crew Operating Manual MASTER
CSP A--013
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--17
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Air Data System
Flight Crew Operating Manual
CSP A--013
MASTER
Air Data Flags --- Primary Flight Display <MST>
Figure 12---30---12
ADC 1 or 2 (amber)
　
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