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RADIO ALTIMETER DESCRIPTION/OPERATION
GENERAL
The Radio Altimeter (RA) system consists of two
independent systems comprising :
- Two transceivers with associated mounts and
fans,
- Two transmission antennae,
- Two reception antennae.
TRANSCEIVER
The RA transceiver measures the radio height of the
aircraft in relation to the ground.
The transceiver operates in a frequency range of 4200
to 4400 Mhz.
ANTENNAE
The RA system includes two identical transmission and
reception antennae.
The operating range of the antenna according to the
aircraft attitude is limited to + or - 30 degree for
pitch and roll.
FAN
Each RA transceiver is cooled by an associated fan,
attached under the transceiver mount.
A capacitor is mounted on the fan case in order to
suppress the parasites.
INDICATING
In normal operation, RA 1 provides the radio height
to the Captain Primary Flight Display (PFD) and RA 2
to the First Officer PFD through the Display Management
Computers (DMCs).
In case of one transceiver failure the DMC
automatically switches to the other one.
The radio height information appears on the PFDs when
less than or equal to 2500 ft.
USERS
The RA information is sent to various systems through
ARINC 429 buses.
- EGPWS for terrain warnings,
- FMGCs for processing data,
- FWCs for call out indications and warnings,
- ELACs for integration into various flight
parameters.
TMURADA01-T01 LEVEL 3
EFFECTIVITY 34-42-00 Page 2
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
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RADIO ALTIMETER DESCRIPTION/OPERATION
TMURADA01-P01 LEVEL 3
EFFECTIVITY 34-42-00 Page 3
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
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RADIO ALTIMETER DESCRIPTION/OPERATION
EIU
The Engine Interface Unit (EIU) 1(2) sends a ground
discrete to the RA 1(2) to inhibit the test on ground
when the associated engine is operating.
N2 rating > minimum idle rating.
LGCIU
The Landing Gear Control Interface Unit (LGCIU)
provides the flight/ground information which is used
by the receiver BITE module to count the flight legs.
CFDIU
The Multipurpose Control and Display Units (MCDUs)
allow the systems to be tested via the Centralized
Fault Display and Interface Unit (CFDIU).
The tests are only available on ground.
TMURADA01-T01 LEVEL 3
EFFECTIVITY 34-42-00 Page 4
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
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THIS PAGE INTENTIONALLY LEFT BLANK
TMURADA01 LEVEL 3
EFFECTIVITY 34-42-00 Page 5
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 267
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SELF EXAMINATION
In normal operation, how is the height data
provided ?
A - By system 1 to Capt PFD and F/O PFD
B - By system 2 to CAPT PFD and F/O PFD
C - By system 1 to CAPT PFD and by system 2
to F/O PFD
What happens if Radio Altimeter 1 fails ?
A - RA 2 provides data to the EGPWC.
B - FMGC 1 provides data to the EGPWC.
C - The EGPWC no longer receives Radio
Altitude.
TMURADA01 LEVEL 3
EFFECTIVITY 34-42-00 Page 6
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 268
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34 - NAVIGATION
34-42-00 RA INDICATIONS ON PFD AND
AUTOMATIC CALL OUT
CONTENTS:
Decision Height (DH)
Radio Height
Analog Indication
Rising Runway Indicating
Failure
Automatic Call Out
Self Examination
TMURADB01 LEVEL 2
EFFECTIVITY 34-42-00 Page 1
Sep 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 269
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RA INDICATIONS ON PFD AND AUTOMATIC CALL OUT
DECISION HEIGHT (DH)
After the selection made by the pilot on the
Multipurpose Control Display Unit (MCDU), the Decision
Height (DH) data is displayed in the fourth column of
the Flight Mode Annunciator as soon as Radio Altimeters
operate.
When the radio height reaches the Decision Height (DH),
an amber DH message flashes then remains steady.
RADIO HEIGHT
　
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