1_ The Navigation Display (ND) it provides the following
indications:
- weather radar image
- windshear events location for advisory, caution or warning
alert
- windshear failures.
2_ The Primary Flight Display (PFD) it provides all visual alerts
for caution or warning alert.
NOTE : The Flight Warning Computers (FWC) and the FDIU receive____
WR/PWS data through the DMCs. These data are used by
the FWCs to display windshear function failure and
windshear function de-activation.
The FDIU records the windshear alert and failure.
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(d)
Enhanced Ground Proximity Warning System (Enhanced GPWS) (optional) The Enhanced GPWS receives WR/PWS alerts from WXR1 Hazard bus and WXR2 Hazard bus (when the second transceiver is installed) to determine the alert priorities. Predictive Windshear alerts override a terrain display and revert to the WR display with the corresponding windshear data. The alert priorities between the WR/PWS and the Enhanced GPWS have been defined as follows: 1- WR/PWS Warning, 2- WR/PWS Caution, 3- Terrain Warning, 4- Terrain Caution, 5- WR/PWS advisory (no audio), 6- Terrain background (no audio).
(e)
Flight Data Interface and Management Unit (FDIMU) One ARINC 429 high speed bus (hazard) provides radar data to be recorded on FDIMU.
(f)
Windshear function enable signal This discrete input provided by the radar control box through AUTO/OFF switch enables the windshear function. This discrete signal is also transmitted to the DMCs which use it for the logic of windshear messages displayed.
(4)
Audio Inhibit Discrete Signals (if predictive windshear function is activated) These discretes are used to indicate whether the aural alert output has to be active or not:
-
predictive windshear aural alerts (audio inhibit discrete input) are inhibited by the Reactive Windshear System and stall warning.
-
predictive windshear audio inhibit discrete output is used to inhibit other aural alerts generated by systems such as: Traffic Alert and Collision Avoidance System (TCAS) or Ground Proximity Warning System (GPWS) or other FWC warnings. This inhibition occurs each time there is a PWS aural alert.
(5)
Pin Programming (if predictive windshear function is activated)
-audio level program pins set the audio output level of the
synthetic voice for windshear aural alert.
-SDI (Source Destination Identification Encoder) program pins encode the location of the WR/PWS unit on the aircraft when two transceivers are installed.
-qualifier polarity program pins: for both qualifiers, this pin program indicates the validity of the signal.
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-CFDIU interface program pins: when the second WR/PWS is installed on the aircraft, this program pin is activated. The WR/PWS can communicate with the CFDIU.
-caution alert audio program: two program pins are provided to select the type of windshear caution aural alert. The MONITOR RADAR DISPLAY synthetic voice is generated instead of the chime.
-
windshear function enable program pins is used to activate the windshear function.
-
windshear function bite enable signal allows to send to CFDIU failure related to the predictive windshear function.
C. General Technical Characteristics The WR/PWS system is mainly used to detect and localize various types of atmospheric disturbances and windshear events in the area scanned by the antenna. The system shows the disturbance intensity through the use of colors which vary with the atmospheric precipitation rate. The disturbances are shown to the crew members on the NDs with different colors:
-black, green, yellow, red to quantify the precipitation rates
-magenta to represent the turbulence areas up to 40 NM.
The system can show the location of the windshear events via the NDs:
alternating black and red arcs depict the windshear event.
As the minimum display range is 10 NM, two yellow radials appear at the
edges and start beyond the windshear (W/S) event.
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4. Power Supply
____________
**ON A/C 001-049, 101-105, 151-199,
Energization of the system is through a 115VAC/400 Hz bus:
-1XP via the busbar 101 XP-C for transceiver 1
Energization of the weather radar control unit and of the WR antenna drive
is through the transceiver.
Consumption of the transceiver is 125 W nominal.
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