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The radio altitudedisplayis displayed asbothadigitaland amovingtape readout. The
digital readoutappears as theaircraftdescendsthrough2,500feet. Thetapeis ananalog
scale thatis displayed whenthe airplane is belowanaltitudeof1,225feet.
Decision heightis set(from 0to 999feet)usingeitherpilot’s air datareference panel. Atest
buttonis provided ontheair datareference panelto verifytheoperation ofthe radio
altimetersystem.
Flight Crew Operating Manual MASTER
CSP A-
013
Vol. 1
12-
40-
2
FLIGHT INSTRUMENTS
REV56,Jan 31/03
Radio Altimeter System
MFD2
PFD2
MFD1
PFD1
<0040>
<0040>
Radio Altimeter System <MST>
Figure 12---40---1
Flight Crew Operating Manual
MASTER
CSP A-
013
FLIGHT INSTRUMENTS Vol. 1 12-
40-
3
Radio Altimeter System REV 56, Jan 31/03
DH / MDA
Usedto select decisionheight or minimum descent altitude.
DH -
Decision heightreadoutis selectedto beadjusted.
MDA -
Minimum descent altitude readout is selectedto beadjusted.
PUSH / SET / OFF
Usedto adjust selected altitude readout. Whenpushed, the selected altitude readout (DH or MDA) is displayed onthe PFD.
When rotated, the selected altitude readout is adjusted(DHin1ft increments, MDAin 10ft increments).
Whenpushedagain, the selected altitude
RA TEST
Usedto initiate radio altitudetest.
Air Data Reference Control Panel Figure 12---40---2
Flight Crew Operating Manual MASTER
CSP A-
013
FLIGHT INSTRUMENTS Radio Altimeter System Vol. 1 12-
40-
4
REV 56, Jan 31/03
Decision Height Readout (cyan)
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