(3)
WR Antenna Drive The WR antenna drive is the interface of the transceiver to control and monitor the azimuth and elevation of the antenna.
(4)
Weather Radar Antenna The antenna is used for transmitting and receiving radar radio frequency signals.
R 1EFF : 001-049, 101-149, 151-199, 201-299, 1 34-41-00Page 15 1301-399, 401-499, 1Config-3 Aug 01/05 1 1 1CES 1 1EFF : ALL 1 34-41-00Page 16 1 1 Config-3 May 01/05 1 1 1CES 1 1EFF : ALL 1 34-41-00Page 17 1 1 Config-3 May 01/05 1 1 1CES 1 B. Peripherals
(5) Transceiver Mounting Tray with a Wave Guide
It allows to install the transceiver on the aircraft rack and
connects the transceiver to the wave guide.
R **ON A/C 051-099,
R A. General
R The weather radar system, which complies with ARINC Characteristics 708A,
R consists of:
R - two transceivers 1SQ1, 1SQ2,
R - a dual control unit 3SQ,
R - a dual antenna drive 7SQ,
R - an antenna plate 11SQ,
R - a transceiver dual mounting tray 9SQ with a wave guide switch.
R (1) Weather Radar Transceiver
R The receiver-transmitter is the heart of the WR/PWS system, the
R additional necessary wiring and interfaces enable the weather radar
R transceiver to operate as a PWS (WR/PWS).
R The receiver-transmitter ensures the following functions:
R - generation of the very short intense pulses of microwave energy via
R an X-band wave guide to the antenna, and the processing of their
R echoes (radio frequency signals) to obtain the desired information,
R - the receiver signal is formatted into 1600-bit ARINC 453 words and
R sent to the Display Management Computers (DMCs),
R - acquisition of data from Radio Altimeters (RA1 and RA2) and other
R specific interfaces,
R - windshear event detection and generation of the appropriate signal,
R - BITE function of the system.
R (2) Weather Radar Control Unit
R The control unit generates a 32-bit (label 270) serial control word
R which describes the selected operating modes (system activation,
R weather radar modes, activation of the predictive windshear
R function).
R The transceiver receives one ARINC 429 bus coming from the control
R unit.
R Moreover, the predictive windshear function can be de-activated if
R the PWS does not operate correctly.
R (3) WR Antenna Drive
R The WR antenna drive is the interface of the transceiver to control
R and monitor the azimuth and elevation of the antenna.
R R R (4) Weather Radar Antenna The antenna is used for transmitting and receiving radar radio frequency signals.
R R (5) Transceiver Dual Mounting Tray with a Wave Guide It allows to install each transceiver on the aircraft rack and
R R R R R connects the activated transceiver to the wave guide. The wave guide switch is integral with the mounting tray. It ensures switching of the RF signal from the antenna to each transceiver. Moreover, control circuits recopy the wave guide switch position to avoid transmission on a closed wave guide.
R **ON A/C ALL
NOTE : The weather radar and windshear detection image (if the____ predictive windshear function is activated) is shown on the Captain and First Officer Navigation Displays (ND) and the windshear warning is shown on Captain and First Officer Primary Flight Displays (PFD) and on the upper ECAM DU. The NDs and PFDs are connected to the three Display Management Computers (DMC) and to the Captain and First Officer EFIS control sections of the FCU.
NOTE : If the Enhanced GPWS is operative, the WR image is replaced by____ the terrain image, on the Captain and First Officer NDs, during a terrain alert or a crew action. More explanations are given in 34-48.
NOTE : The ADIRUs give to the weather radar system:____ - the altitude and the true airspeed (TAS) information (Ref. 34-13-00), - the attitude, ground speed, magnetic heading, true heading, E/W velocity, N/S velocity, track angle and drift angle (Ref. 34-14-00). These data ensure the radar antenna stabilization and the
corrections of the Doppler mode (turbulence).
(1) Digital serial data inputs
The transceiver receives digital serial data inputs from the
following components:
(a)
Radio Altimeter The Radio Altimeter provides altitude information over two ARINC 429 bus inputs to the WR/PWS (label 164). This data is used for automatic activation of the windshear function. The second bus is for redundancy.
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