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WXR SYSTEM - SELF-TEST 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 TEST 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 Push the WXR switch on the EFIS control panel to apply power to the WXR R/T. Test Operation During the test, these things happen:
737-700 MAINTENANCE TRAINING MANUAL
-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 does not show 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 annuciations.
The test pattern shows until you select another mode on the WXR panel or EFIS control panel.
Test Pass
For a valid WXR self-test, CDS shows these displays:
-WXR test pattern -Amber WINDSHEAR message on ND -Aural - TWO TONE CHIME -Red WINDSHEAR message on ND and ADI -Aural message - GO AROUND, WINDSHEAR AHEAD, (pause)
WINDSHEAR AHEAD, WINDSHEAR AHEAD
-WXR on alert message line one
-TEST on alert message line two.

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737-700 MAINTENANCE TRAINING MANUAL

WXR SYSTEM - SELF-TEST 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
-CON - control panel fault
-STAB -attitude input fault
-CAL - calibration fault.

NOTE: There is no aural output from the 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.
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737-700 MAINTENANCE TRAINING MANUAL

TEST PASS DISPLAY
PWS FAIL ON ND
WINDSHEAR
ALERT (RED)

WINDSHEAR ALERT MSG (AMBER OR
RED)
MAGENTA
RED
YELLOW
GREEN
TEST PASS MESSAGE (AMBER)
AMBER WINDSHEAR ON ND
(AURAL) TWO TONE CHIME
TEST FAIL DISPLAY
(AURAL) WINDSHEAR AHEAD, WINDSHEAR AHEAD

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WXR SYSTEM - SELF-TEST

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A34-43-00-021.fm
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL

WXR SYSTEM - R/T SELF-TEST
R/T Self-Test
Push the left self-test switch to start a test of the weather radar system. The system operates six seconds and the display shows TEST IN PROGRESS. After the test, the display shows one of these three displays:
　
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