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velocity calculations:
- TAS, Altitude (or corrected altitude), EW and
NS velocity GS, TRK angle, TRUE HDG and MAG
HDG.
LGCIU
The Landing Gear Control Interface Unit (LGCIU) sends
Flight/Ground information to the transceiver.
This discrete signal is used by the receiver BITE
module to count the flight legs.
In windshear condition, a landing gear extended signal
is used in order to determine the transition from the
landing mode to the take-off mode.
CFDIU
The Multipurpose Control and Display Units (MCDUs)
allow the system to be tested via the Centralized Fault
Display Interface Unit (CFDIU).
The test is only available on ground.
During the test, the antenna carries out an elevation
and an azimuth scanning sequence.
QUALIFIERS A AND B SIGNALS
Two types of qualifier inputs are required to prevent
automatic activation of the windshear function.
- Qualifier A: 2 qualifiers are used (QA1 and QA2).
Provided by the ATC/TCAS control unit, which
indicates the position of the AUTO/ON/STBY switch.
Qualifier A is valid when AUTO or ON is selected.
- Qualifier B: 2 qualifiers are used (QB1 and QB2).
Provided by EIU 1 and 2, which indicates a normal
engine oil pressure.
Qualifier B is valid when the engine is running
(high oil pressure).
The Windshear function is automatically activated
below 2300ft RA and at least one of the two qualifier
inputs, of both qualifiers A and B, has to be valid.
RA
The Radio Altimeter provides altitude information
through an ARINC 429 bus.
This data is used for automatic activation of the
windshear function.
AUDIO INHIBIT SIGNALS
These discretes are used to indicate whether the aural
alert output has to be active or not.
- predictive windshear aural alerts (discrete
input) inhibited by stall warning,
- predictive windshear discrete output is used
to inhibit aural alerts generated by TCAS or
GPWS or other FWC warnings.
AUDIO MIXING BOX
An analog audio output allows the transmission of the
aural alert windshear to an audio mixing box connected
to loudspeakers.
TMUWPWC01-T02 LEVEL 3
EFFECTIVITY 34-41-00 Page 4
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 222
ALL
TMUWPWC01-P02 LEVEL 3
WR/PWS DESCRIPTION/OPERATION - SYSTEM INTERFACES
EFFECTIVITY 34-41-00 Page 5
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 223
ALL
WR/PWS DESCRIPTION/OPERATION
SYSTEM INTERFACES (Cont’d)
EGPWS
The Enhanced GPWS receives Predictive Windshear alerts
from the radar hazard bus to determine the priorities.
Alert Priorities:
- WR/PWS warning,
- WR/PWS caution,
- GPWS Terrain warning,
- GPWS Terrain caution.
INDICATING
The Weather Radar transceiver is connected to the DMCs
by means of two ARINC 453 buses.
Each data cable is terminated at one end by a low
inductance resistor (68 ohms) to avoid a signal return.
The Weather Radar image is shown on the CAPT and F/O
NDs when ROSE or ARC mode is selected on the EFIS
control panel.
The Windshear events are shown on the CAPT and F/O NDs
and all visual alerts on the CAPT and F/O PFDs.
NOTE: When both EFIS control panels are in PLAN mode,
the WR/PWS transceiver is de-energized.
TMUWPWC01-T03 LEVEL 3
EFFECTIVITY 34-41-00 Page 6
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 224
ALL
TMUWPWC01-P03 LEVEL 3
WR/PWS DESCRIPTION/OPERATION - INDICATING
EFFECTIVITY 34-41-00 Page 7
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 225
ALL
SELF EXAMINATION
Which component controls antenna stabilization?
A - ADIRU.
B - Transceiver.
C - Antenna.
Which data is used for antenna stabilization?
A - Pitch and roll.
B - Selected tilt angle, antenna azimuth
angle and elevation angle.
C - A and B.
When is the Windshear function automatically
activated?
A - Below 2300ft and one of the two
qualifier inputs, of both qualifiers A
and B, is valid.
B - Always when a windshear event is
encountered.
C - When the AUTO/ON/STBY selector on the
ATC/TCAS Control Unit is in STBY
position.
The Predictive Windshear discrete output is used to:
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