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* Attitude Data
* Heading data
* Air data.
Ground Proximity Warning Computer
PWS sends windshear alert data to the ground proximity
warning computer (GPWC) on the ARINC 708A hazard bus. The
GPWC uses this data to prioritizes alerts. If there is a higher
priority alert, the GPWC sends an inhibit discrete to the WXR.
This discrete inhibits the PWS alert output.
Landing Gear Control Lever Module
The landing gear control lever module sends an analog
discrete to PWS. PWS uses this discrete in its takeoff/
approach alert logic.
Radio Altimeter
The radio altimeter (RA) provides radio altitude data to PWS.
PWS uses radio altitude data to do these functions:
* Turn PWS on and off
* Enable/disable display and alert functions.
Remote Electronic Unit
The WXR sends the PWS aural alerts to the remote electronic
unit (REU).
Autothrottle Microswitch Pack
The left and right autothrottle microswitch packs send a discrete
to the PWS. The PWS uses this discrete to determine the throttle
lever position for the automatic turn on.
Display Electronic Unit
The WXR sends the following discretes to the display electronic
units:
* PWS warning
* PWS caution
* PWS fail.
WXR SYSTEM - PWS INTERFACES
EFFECTIVITY
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Traffic Alert and Collision Avoidance System
WXR sends an inhibit discrete to the traffic alert and collision
avoidance system (TCAS) computer when there is a PWS alert.
This discrete does these functions:
* Changes resolution advisories (RAs) to traffic advisories
(TAs)
* Inhibits all TCAS audio alerts.
WXR SYSTEM - PWS INTERFACES
EFFECTIVITY
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WXR SYSTEM - PWS INTERFACES
WXR SYSTEM - PWS INTERFACES
EFFECTIVITY
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Antenna Tilt
The WXR panel supplies antenna tilt control signals to the WXR
R/T.
Attitude Sources
The WXR R/T uses ADIRU attitude data to stabilize the antenna.
The left ADIRU signals connect to the on-side attitude input of
the WXR R/T. The right ADIRU signals connect to the off-side
attitude input of the WXR R/T.
Attitude Source Select Discrete
Use the IRS select switch to choose the ADIRU source to the
WXR R/T. Set the switch to NORMAL or BOTH ON L to use the
left ADIRU input. Set the switch to BOTH ON R to use the right
ADIRU input.
WXR R/T Antenna Control
The WXR R/T sends signals to the WXR antenna assembly to
control it and make it stable.
Antenna Position Monitoring
The WXR antenna sends antenna position data to the WXR R/T
for scan and elevation feedback.
WXR SYSTEM - ANTENNA CONTROL INTERFACE
EFFECTIVITY
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WXR SYSTEM - ANTENNA CONTROL INTERFACE
WXR SYSTEM - ANTENNA CONTROL INTERFACE
EFFECTIVITY
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General
The weather radar (WXR) control panel has these functions:
* Mode selection
* Tilt control
* Gain control.
Mode Selector
SHZ 001-003
The control panel has these mode switches:
* TEST - starts a self-test of the R/T and shows the test results
on the NDs
* WX - R/T shows the weather mode
* WX+T - R/T shows weather and turbulence data on the NDs.
The turbulence range is up to a maximum of 40 nautical
miles (NM). If a range more than 40 NM is set on the EFIS
control panel, the NDs show weather data only.
* MAP - R/T shows ground and terrain features on the NDs
* IDNT - starts ground clutter suppression
* STAB - push the stab switch to start stabilization of the
antenna. Stabilization corrects the antenna for aircraft
attitude changes.
SHZ 009-999
The control panel has these mode switches:
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