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Radio Altimeter

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Page 1: Radio Altimeter

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Page 2: Radio Altimeter

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There are no radio altimeter controls in the cockpit. Both radio altimeters activate automatically when AC power is applied to the aircraft.

There are no radio altimeter controls in the cockpit. Both radio altimeters activate automatically when AC power is applied to the aircraft.

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Page 3: Radio Altimeter

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Page 4: Radio Altimeter

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After a brief self test, the radio altimeters are in a standby mode during ground operations. They become active at take-off and then operate continuously until touchdown.

After a brief self test, the radio altimeters are in a standby mode during ground operations. They become active at take-off and then operate continuously until touchdown.

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Page 6: Radio Altimeter

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Radio height is always expressed as the number of feet between the bottom of the wheels and ground.

Radio Altimeter data is supplied to several different users and is displayed on both PFDs at all times below 2500 feet AGL.

Radio height is always expressed as the number of feet between the bottom of the wheels and ground.

Radio Altimeter data is supplied to several different users and is displayed on both PFDs at all times below 2500 feet AGL.

FMGC

RADIO ALTIMETERDATA

GPWS

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Page 7: Radio Altimeter

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Normally, Radio Altimeter 1 (RA1) height is displayed on the captain’s PFD and RA 2 on the First Officer’s PFD.

RADIO ALTIMETER2

RADIO ALTIMETER1

Captain’s side First officer’s side

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Page 8: Radio Altimeter

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The radio altitude display on the PFD changes in color and size based on height above ground and / or proximity to the decision height.

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Page 10: Radio Altimeter

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This color coded digital readout is coupled with a white ground indication line and a red ground ribbon on the Altimeter scale.

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The ground indication line and the red ground ribbon correspond to the rising ground level when the aircraft is descending.

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IICRRCRR

Page 12: Radio Altimeter

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As the aircraft descends below approximately 500 feet AGL, the red ribbon appears at the bottom of the altimeter scale and begins to move up.

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The white ground line moves from the bottom of the PFD towards the horizon.

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At touchdown, the ribbon is in the center of the altitude readout and the white ground line is merged with the horizon, as shown. These are designed to be used as a ground reference during autoland operations.

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In addition to the visual indications, during approach, there is a synthetic voice for radio height announcement.

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LIST OF LIST OF SUBJECTS LIST OF LIST OF SUBJECTS

OperationOperation

PFD IndicationsPFD Indications

GeneralGeneral

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