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Indicates that single air data computer
source has been selected.
ADC 1 -- Air data computer 1 selected.
ADC 2 -- Air data computer 2 selected.
<0015> ADC 2
REV 56, Jan 31/03
Vol. 1 12--30--18
FLIGHT INSTRUMENTS
Air Data System
Flight Crew Operating Manual MASTER
CSP A--013
I. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Air Data
ADC 1 DC ESS 4 D3
Flight Data
g Computer ADC STBY DC BAT 1 P8
ADC 2 DC BUS 2 2 H6
Vol. 1 12--40--1
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Radio Altimeter System
Flight Crew Operating Manual
CSP A--013
MASTER
1. RADIO ALTIMETER SYSTEM
The radio altimeter (RADALT) system provides an accurate measurement of absolute
altitude (height above terrain) from 0 to 2500 feet AGL. Radio altitude information is
supplied to the following:
There are two radio altimeter (RADALT) systems installed on the aircraft. Each system
provides an accurate measurement of absolute altitude (height above terrain) from 0 to 2500
feet AGL. Radio altitude information is supplied from both radio altimeters to the following:
<0045>
S PFD’s
S Flight control systems
S Ground proximity warning system (GPWS)
S Enhanced ground proximity warning system (EGPWS) <0040>
S Traffic alert and collision avoidance (TCAS).
The radio altimeter provides the pilot’s and copilot’s PFDs with the following:
S Radio altitude readout
S Decision height readout
S Decision height alerts and radio altimeter fail flags.
When a failure is detected during flight, a red warning flag is displayed on the PFD’s.
The radio altitude display is displayed as both a digital and a moving tape readout. The
digital readout appears as the aircraft descends through 2,500 feet. The tape is an analog
scale that is displayed when the airplane is below an altitude of 1,225 feet.
Decision height is set (from 0 to 999 feet) using either pilot’s air data reference panel. A test
button is provided on the air data reference panel to verify the operation of the radio
altimeter system.
REV 56, Jan 31/03
Vol. 1 12--40--2
FLIGHT INSTRUMENTS
Radio Altimeter System
Flight Crew Operating Manual MASTER
CSP A--013
Radio Altimeter System <MST>
Figure 12---40---1
PFD 1 MFD 1 MFD 2 PFD 2
<0040> <0040>
Vol. 1 12--40--3
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Radio Altimeter System
Flight Crew Operating Manual
CSP A--013
MASTER
Air Data Reference Control Panel
Figure 12---40---2
RA TEST
Used to initiate
radio altitude test.
BARO
DH MDA
SPEED REFS
RATEST
HPA / IN
TGT VSPDS
SEL
Air Data Reference Panel
Pilot’s and Copilot’s Side Panels
DH / MDA
Used to select decision height or
minimum descent altitude.
DH -- Decision height readout is
selected to be adjusted.
MDA -- Minimum descent altitude
readout is selected to be adjusted.
PUSH / SET / OFF
Used to adjust selected altitude readout.
When pushed, the selected altitude readout
(DH or MDA) is displayed on the PFD.
When rotated, the selected altitude readout
is adjusted (DH in 1 ft increments, MDA in
10 ft increments).
When pushed again, the selected altitude
readout is removed.
REV 56, Jan 31/03
Vol. 1 12--40--4
FLIGHT INSTRUMENTS
Radio Altimeter System
Flight Crew Operating Manual MASTER
CSP A--013
Radio Altimeter Indication <MST>
Figure 12---40---3
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
Radio Altimeter
DECISION
HEIGHT
Ground Bar (amber)
Indicates terrain.
RA Flag (red)
Indicates that radio altitude data has failed.
Appears in place of radio altitude readout.
2
3
1
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
Decision Height Readout (cyan)
Indicates selected decision height as set on the
air data reference panel (range is 0 to 999 feet).
Red dashes indicate failed input.
<0015>
not included in <JAA>
Decision Height Pointer (cyan)
Indicates selected decision height as
set on the air data reference panel.
Disappears when out of range.
Radio Altitude Readout (green)
Indicates radio altitude from 0 to 2,500 feet.
At decision height, readout turns amber.
Displayed upon descent below 2,500 feet RA.
Decision Height Alert (amber)
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