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from the antenna through the waveguide to the R/T.
WXR SYSTEM - POWER AND ANALOG INTERFACES
EFFECTIVITY
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EFFECTIVITY
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Digital Inputs
The WXR R/T receives data from these systems:
* Air data inertial reference system (ADIRS)
* Radio altimeter (RA) system
* Common display system (CDS).
Air Data Inertial Reference System
The ADIRS sends this inertial reference (IR) data to the WXR R/
T on a high-speed ARINC 429 data bus:
* Pitch angle
* Roll angle
* Groundspeed
* True heading
* Magnetic heading
* Drift angle
* Discretes.
The WXR R/T uses the IR data for windshear calculation,
sensitivity time control (STC), and stabilization.
The ADIRS sends this air data (AD) to the WXR R/T on a lowspeed
ARINC 429 data bus:
* Uncorrected baro altitude
* Corrected baro altitude
* True airspeed
* Computed airspeed.
The WXR R/T uses altitude and airspeed data for windshear
calculation. The WXR R/T also uses altitude data for sensitivity
time control calculations.
Radio Altimeter System
The radio altimeters send radio altitude on a low-speed ARINC
429 data bus to the WXR R/T for the predictive windshear (PWS)
function. The PWS uses this data to do these functions:
* Turn PWS on and off
* Enable/disable display and alert functions.
Common Display System
The EFIS control panels send range data and the WXR on/off
discrete to the display electronic units (DEUs) on an ARINC 429
data bus.
The DEUs send range data from the EFIS control panel to the
WXR R/T on ARINC 429 data buses. The DEUs send the WXR
on/off discrete to the WXR control panel on a discrete wire.
Control Inputs
The WXR control panel supplies this data to the WXR R/T:
* Transmit mode
* Tilt
* Gain control
* On/off discrete.
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EFFECTIVITY
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WXR Output Data and Display
The WXR R/T sends display data on an ARINC 453 data bus to
the terrain weather relays. The display data goes from the
terrain weather relays to the DEUs to show on the navigation
displays. The terrain/weather radar relays are controlled by the
ground proximity warning computer (GPWC).
The WXR R/T sends windshear alert data on an ARINC 708A
hazard bus to the ground proximity warning system (GPWS).
The GPWS uses this data to prioritize alert callouts. If a higher
GPWS alert exists, the GPWC switches the terrain weather
relays and terrain data is shown on the NDs.
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EFFECTIVITY
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General Description
The predictive windshear (PWS) part of the weather radar
(WXR) system interfaces with other airplane systems and
components.
Air Data Inertial Reference System
The air data inertial reference system (ADIRS) sends this data
to PWS:
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