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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 PFDs
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.
Vol. 1 12--40--2
FLIGHT INSTRUMENTS
Radio Altimeter System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Radio Altimeter ISystem --- Block Diagram <1045>
Figure 12---40---1
Air Data Reference Panel
Pilot’s Side Panels
Primary Flight Display
Pilot’s Instrument Panel
Primary Flight Display
Copilot’s Instrument Panel
Air Data Reference Panel
Copilot’s Side Panels
TEST &
DH SET
IAPS
(AFCS)
SSECU 1
SSECU 2
EGPWS
TCAS
RAC 2
RAD ALT 2
ALTITUDE
AID
FREQUENCY
PHASE
TX RX
ALTITUDE
RAC 1
RAD ALT 1
AID
FREQUENCY
PHASE
TX RX
TEST &
DH SET
Vol. 1 12--40--3
FLIGHT INSTRUMENTS
Radio Altimeter System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
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 adjusts 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.
Vol. 1 12--40--4
FLIGHT INSTRUMENTS
Radio Altimeter System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Radio Altimeter Indication <1015,JAA>
Figure 12---40---3
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
Radio Altimeter
DECISION
HEIGHT
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.
Radio Altimeter
Indicates current radio altitude.
Displayed upon descent below 1,225 feet RA.
Decision Height Alert (amber)
Indicates that airplane has arrived at decision height.
During go--around, alert is disabled
at decision height +100 feet.
Alerts inhibited below 5 feet.
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 Pointer (cyan)
Indicates selected decision height as
set on the air data reference panel.
Disappears when out of range.
0
Vol. 1 12--40--5
FLIGHT INSTRUMENTS
Radio Altimeter System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
A. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Radio Altimeter
RAD ALT 1 DC BUS 1 1 J4
Altimeter RAD ALT 2 DC BUS 2 2 J2 <1045>
Vol. 1 12--40--6
FLIGHT INSTRUMENTS
Radio Altimeter System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
THIS PAGE INTENTIONALLY LEFT BLANK
Vol. 1 12--50--1
FLIGHT INSTRUMENTS
Attitude and Heading Reference System Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
2. INERTIAL REFERENCE SYSTEM <1025>
The inertial reference system (IRS) provides inertial outputs of attitude, heading, angular
rates, linear acceleration and present position to be displayed on the flight displays and to
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