Transcript NAVIGATION - Radio Altimeters

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Radio alti presentation
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Two radio altimeters are installed in the A320.
They measure the aircraft height above the ground
accurately .
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Radio alti presentation
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There are no radio altimeter controls in the
cockpit. Both radio altimeters come on
automatically when AC power is applied to the
aircraft.
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After a brief self test, the radio altimeters are in
a standby mode during ground operations. They
become active at lift-off and then operate
continuously until touchdown.
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FMGC
RADIO ALTIMETER
DATA
GPWS
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 PFD at all
times below 2500 feet AGL.
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Radio alti presentation
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Captain’s side
First officer’s side
RADIO ALTIMETER
1
RADIO ALTIMETER
2
Normally, Radio Altimeter 1 (RA1) height is
displayed on the captain’s PFD and RA 2 on the First
Officer’s PFD.
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Radio alti presentation
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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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Radio alti presentation
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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 raising ground level when
the aircraft is descending.
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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 centre 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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Depending on individual airline requirements, auto
call-out announcements are made at pre-determined
radio-altimeter heights.
Example, “FOUR HUNDRED” at four hundred feet
radio altitude.
These call-outs will be heard even if the loudspeakers
are turned off.
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Definitive text :
At pre-determined heights, the announcement will
be heard through the loudspeakers, even when the
loudspeakers are turned off.
For example, at four hundred feet, a call out of
“FOUR HUNDRED” is made.
Module completed
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Radio alti presentation
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Radio alti presentation
19/17