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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-43-00-023
WXR SYSTEM - SELF-TEST START
WXR SYSTEM - SELF-TEST START
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-43-00-023
Training Information Point
During a test, the weather radar (WXR) system transmits a few
pulses to let the BITE monitor the operation. Do not do a test of
the WXR system in a hanger. Make sure the nose of the
airplane points away from buildings and other aircraft or large
metal objects.
Test Preparation
On the WXR control panel, select these functions:
* Set the mode selector to the WXR position
* Set the tilt control to 0 degrees
* Set the gain control to the AUTO position.
On the EFIS control panel, select these functions:
* Set the range selector to 40 NM
* Set the mode selector to the correct ND mode (expanded
APP, expanded VOR, expanded MAP or centered MAP).
Also, adjust the inner ND brightness control to the middle
position.
Test Start
On the EFIS control panel, push the WXR switch to apply power
to the WXR R/T. On the WXR control panel, set the mode
selector to the TEST position to start the test.
NOTE: If the WXR mode selector is in the TEST position before
you apply power to the WXR R/T, you must set the
mode selector to another mode and then set the mode
selector to TEST to start the test.
Test Operation
During the test, these things happen:
* R/T transmits a few pulses to let the BITE monitor for correct
operation
* R/T makes a test pattern and sends it to the DEU to show on
the NDs
* R/T sends test messages and mode, gain, and tilt
information to the DEUs to show on the NDs
* WXR test pattern shows on ND.
The PWS symbol shows in the TEST pattern. If PWS finds a
windshear threat while in TEST mode, the test stops. PWS then
shows the actual display data and alert annunications.
The test pattern shows until you select another mode on the
WXR panel or EFIS control panel.
WXR SYSTEM - SELF-TEST
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-43-00-020
Test Pass
For a valid WXR self-test, CDS shows these displays:
* WXR test pattern
* Amber WINDSHEAR message on ND
* Aural message - MONITOR RADAR DISPLAY
* Red WINDSHEAR message on ND and PFD
* Aural message - GO AROUND, WINDSHEAR AHEAD,
(pause) WINDSHEAR AHEAD, WINDSHEAR AHEAD
* WXR on alert message line one
* TEST on alert message line two.
Test Fail
For a test that fails, these are the indications on the ND:
* WXR test pattern does not show
* WXR shows on alert message on line one
* FAIL shows on alert message on line two
* Line three shows all of the failures.
These are the messages that can show on line three:
* R/T - receiver/transmitter fault
* ANT - antenna fault
* CONT - control panel fault
* ATT - attitude input fault
* WEAK - calibration fault.
* External Fault Tilt Code
Attitude - Left -1
Attitude - Right +1
Radio Altitude - Left -2
Radio Altitutde - Right +2
DADC - Left -3
DADC - Right +3
EIFIS - Left -4
EIFIS - Right +4
Qualifier Reasonableness -5
Pitch/Roll Reasonableness -6
Air/Ground Reasonableness -7
W/S Inhibit Input -8
There is no Aural output from WXR if the test fails.
Training Information Point
There are bite instructions to do a manual test of the weather
radar in the CDS DEU BITE menu. This test is WXR INTERFACE
TEST and shows three pages of instructions. This test is for the
CDS/WXR interface.
WXR SYSTEM - SELF-TEST
EFFECTIVITY
SHZ ALL 34-43-00
Page 66
D633A101-SHZ1 Jun 10/2007
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-43-00-020
WXR SYSTEM - SELF-TEST
WXR SYSTEM - SELF-TEST
EFFECTIVITY
SHZ ALL 34-43-00
Page 67
D633A101-SHZ1 Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-43-00-020
General
This page is for reference.
WXR SYSTEM - SYSTEM SUMMARY
EFFECTIVITY
SHZ ALL 34-43-00
Page 68
D633A101-SHZ1 Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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