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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-43-00-012
WXR SYSTEM - EFIS CONTROL PANEL - OPERATION
WXR SYSTEM - EFIS CONTROL PANEL - OPERATION
EFFECTIVITY
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System Select
The receiver transmitter (R/T) gets 115v ac from XFR bus 2. The
keep alive power supply makes unregulated and regulated 28v
dc. The unregulated 28v dc power goes to the power relay in the
R/T and also provides the interlock (INTRLK) signal through the
WXR control panel to switch S1. S1 is held closed.
System On
To make the WXR system operate, push the WXR switch on one
of the EFIS control panels.
When you push the WXR switch, the on-side display electronics
unit (DEU) supplies a ground through the WXR control panel.
The ground then goes through switch S1 of the R/T. This ground
lets the unregulated 28v dc power from the power supply
energize the relay to close switches S2 and S3. The keep-alive
power supply sends regulated 28v dc power through switch S2
to energize the WXR CP power supply. The 115v ac goes
through switch S3 to energize these things:
* R/T low voltage power supply
* WXR antenna drive
* WXR cooling fan.
Certain conditions cause the predictive windshear (PWS)
function to turn the WXR system on automatically. When this
happens, the ground signal comes from the PWS card in the R/T
instead of the DEUs.
System Off
To make the WXR system go OFF, push the WXR switch on the
EFIS control panel to OFF. This removes the ON discrete from
the DEU. If more than one WXR switch is on, push all of the
switches to OFF.
WXR SYSTEM - SYSTEM SELECT AND SYSTEM ON/OFF
EFFECTIVITY
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WXR SYSTEM - SYSTEM SELECT AND SYSTEM ON/OFF
WXR SYSTEM - SYSTEM SELECT AND SYSTEM ON/OFF
EFFECTIVITY
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Display Modes
The navigation display (ND) shows WXR system data in these
modes:
* Expanded approach
* Expanded VOR
* Center MAP
* Expanded MAP.
WXR System Display Data
The ND shows these displays:
* WXR data
* WXR system messages
* WXR alert messages.
WXR Displays
The WXR data on the ND shows the weather or the terrain in
front of the airplane. Colors show the strength of the RF return
signals from the weather or the terrain. These are the four
colors for the WXR displays:
* Green - light weather
* Yellow - medium weather
* Red - heavy weather
* Magenta - turbulence.
The WXR system calculates and shows turbulence only to 40
NM.
WXR System Messages
This weather radar data shows on three lines in the bottom left
of the navigation display:
* Mode
* Antenna tilt
* Gain.
Line 1 shows mode. Mode shows this data:
* WXR
* MAP
* WX+T
* TEST.
Line 2 shows the antenna tilt value set on the WXR panel.
Antenna tilt shows 0.0 to + 15 or - 15 degrees.
Line 3 shows gain. Gain shows this data:
* VAR - R/T has gain set by gain switch
* Blank - normal operation (gain switch in AUTO).
All WXR system messages show cyan. There is no annunciation
for the standby mode.
WXR SYSTEM - NORMAL DISPLAYS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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WXR SYSTEM - NORMAL DISPLAYS
WXR SYSTEM - NORMAL DISPLAYS
EFFECTIVITY
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WXR SYSTEM - NORMAL DISPLAYS
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General Description
If the PWS detects a windshear threat, it makes an alert. The
alert may be a warning or a caution. The alert the crew receives
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