(b)
Air Data Reference
Two ARINC 429 low-speed buses provide:
-true airspeed data (label 210) used for velocity calculations
-altitude data (label 203) used for sensitivity time control (STC) calculations
-corrected altitude data (label 204) used only when label 203 is not available.
(c)
Inertial Reference
Two ARINC 429 high-speed buses provide:
-pitch (label 324) and roll (label 325) data for the stabilization and control of the antenna
-east/west velocity (label 367) and north/south velocity (label 366) used for velocity calculations
-ground speed (label 312) used for velocity calculations
-track angle (label 317) used for velocity calculations
-true heading (label 314)
-Magnetic heading (label 320)
-ADIRU align mode (label 270).
NOTE : The main air data and heading altitude data are provided
____ by the Air Data/Inertial Reference System (ADIRS).
(d)
Centralized Fault Display Interface Unit (CFDIU) The WR/PWS communicates with the CFDIU low-speed ARINC 429 buses.
(e)
EFIS Control Section Two ARINC 429 buses provide the CAPT and F/O range selection (label 271). The receiver/transmitter receives one bus from the CAPT EFIS control section and another one from the F/O EFIS control section.
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(2) Discrete inputs The transceiver receives the following discrete inputs:
(a)
Ground/flight signal and landing gear extended signal. These signals are provided by the Landing Gear Control and Interface Unit (LGCIU).
-Ground/flight signal is used to determine the identifying flight phase for BITE
-Landing gear extended signal is used to determine transition from landing mode to takeoff mode to identify a GO AROUND condition. In this case the appropriate aural message is generated.
(b)
Qualifiers A and B signals (if predictive windshear function is activated) Two types of qualifier inputs are required to prevent automatic activation of the windshear function.
-
qualifiers A: two qualifiers A inputs are used. These input signals are provided by the ATC/TCAS control unit. The qualifier A1 signal coming from J1 ATC/TCAS control unit is connected to the WR/PWS transceiver. The qualifier A2 signal coming from J2 ATC/TCAS control unit is connected to the WR/PWS transceiver. The qualifier A2 is for redundancy. This qualifier A is considered valid when one ATC transponder is selected in operative mode on the ATC/TCAS control unit.
-
qualifiers B: two qualifiers B inputs are also used. These input signals are provided by the engine oil pressure sensors indicating when there is normal operating pressure. The qualifier B1 is connected to engine 1 and the qualifier B2 is connected to engine 2. Qualifiers B1 and B2 are connected to the transceiver. This qualifier B is considered valid when the engine is running (high oil pressure).
In order to activate automatically the windshear function, one of each qualifier A and one of each qualifier B have to be valid.
(c) Windshear function enable signal (if predictive windshear function is activated) This discrete input provided by the weather radar control unit through the windshear AUTO/OFF switch activates the windshear function. This discrete signal is also transmitted to the DMCs which use it for the logic of windshear messages displayed.
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(d) Windshear BITE enable signal (if predictive windshear function is activated) This discrete input allows the WR/PWS to manage the BITE windshear failures sent to the CFDIU.
(3) Outputs The transceiver provides the following outputs:
(a)
Displays The WR/PWS is connected to the DMCs by an ARINC 453 bus to transmit the weather radar data and windshear data (if predictive windshear function is activated) on the data word of label 055. All the weather and windshear data received by the DMCs are processed to display weather radar image and windshear events by the Electronic Instrument System (EIS).
(b)
Centralized Fault Display System (CFDS) The WR/PWS is connected to the CFDS to transmit the following words:
-
label 354: LRU identification P/N and S/N (coded in ISO5)
-
label 356: fault message (coded in ISO5)
-
label 377: equipment identification.
(c)
Audio Mixing Box (if predictive windshear function is activated) An analog audio output allows to transmit the aural alert windshear (synthetic voice message) to an audio mixing box connected to loud speakers.
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