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range disagreement message on alert line 3.
These WXR range disagreement messages are possible:
* WXR RANGE DISAGREE; shows when there is a difference
between the EFIS CP range and the WXR R/T range
* MAP/WXR RANGE DISAGREE; shows when there is a
difference between the EFIS CP range, the WXR R/T range,
and the FMC range.
WXR RANGE DISAGREE will show in these modes:
* Expanded approach
* Expanded VOR
* Expanded map
* Centered map.
MAP/WXR RANGE DISAGREE will show in these modes:
* Expanded map
* Centered map.
This happens during a range disagreement:
* WXR display goes out of view
* mode, tilt, and gain messages show
* FMC range shows.
WXR SYSTEM - ND RANGE DISAGREEMENT
EFFECTIVITY
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WXR SYSTEM - ND RANGE DISAGREEMENT
WXR SYSTEM - ND RANGE DISAGREEMENT
EFFECTIVITY
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General
The WXR R/T makes RF pulses and sends them to the antenna.
The antenna transmits pulses and receives the return signals
and sends them to the WXR R/T. The R/T processes the return
signals to make display data that shows on the NDs. The WXR
data on the ND shows the weather patterns in front of the
airplane.
The WXR R/T also comes on automatically during take off and
approach to detect windshear events in front of the airplane. If a
windshear event is detected, the WXR sends cautions or
warnings to the flight compartment.
Control Inputs
The EFIS control panel (EFIS CP) sends the WXR system ON/
OFF discrete on a digital bus to the display electronics unit
(DEU). The DEU sends a discrete to the WXR R/T to turn ON the
weather radar. The discrete goes through the WXR control
panel to ensure the panel is in the airplane. The DEUs only send
the ON discrete if the navigation display is in the correct mode.
The EFIS CP sends range data to the WXR R/T.
The WXR control panel sends control data on a bus to the WXR
R/T. The WXR CP sends these signals:
* Gain
* Tilt
* Mode of operation.
Predictive Windshear Inputs
These are the inputs to the WXR R/T for predictive windshear
(PWS):
* Ground proximity warning system inhibit discrete
* Auto throttle 1 switch pack throttle position discrete
* Auto throttle 2 switch pack throttle position discrete
* Radio altimeter 1 and 2.
The GPWS determines the priority for the aural warnings and
cautions to the flight compartment. If the PWS CPU finds there is
a windshear condition, the WXR R/T sends the warning or
caution to the GPWS.
The auto throttle packs determine the position of the throttles.
When the airplane is on the ground and either throttle is moved
more than 53 degrees, the PWS comes on automatically.
The PWS CPU uses the radio altimeter input to turn the PWS on
or off. When the airplane goes below 2300 feet radio altitude on
approach, the PWS is turned on. When the altitude goes above
2300 feet during takeoff, the PWS is turned off.
WXR SYSTEM - WXR R/T FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Antenna Control
The WXR R/T gets attitude data for antenna stabilization from
the ADIRUs. When the IRS select switch on the navigation/
displays source select panel is in NORMAL or BOTH ON L, the
R/T uses the left ADIRU for stabilization. You put the IRS select
switch to BOTH ON R to change to the right ADIRU stabilization
data. The IRS select switch sends a ground discrete to the WXR
R/T.
WXR Central Processor Unit
The WXR central processor unit (CPU) uses the control data to
control the operation of the R/T and the antenna drive. The CPU
sends these control signals to the transmitter circuits:
* Range
* Gain
* Mode.
Also, the WXR CPU makes the scan and elevation signals from
the ADIRU attitude data. It sends these signals to the antenna
for antenna stabilization. The WXR CPU also gets antenna
position signals from the antenna assembly.
Predictive Windshear Central Processor Unit
The PWS CPU uses inputs from these systems to turn on the
WXR PWS function:
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