*
Push the WXR button to apply power to the selected RT.
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Select TEST on the WXR control panel to start self-test.
Test Operation
These visual and aural annunciations show for a normal test:
*
Amber WINDSHEAR message on ND
*
Aural message -MONITOR RADAR DISPLAY
*
Aural message -GO AROUND, WINDSHEAR AHEAD, (pause) WINDSHEAR AHEAD, WINDSHEAR AHEAD
*
Red WINDSHEAR message on ND and PFD
*
Master warning lights on
*
WXR test pattern shows on the ND
*
EICAS advisory message WINDSHEAR SYS.
The WXR TEST pattern shows until you select another mode on the WXR panel or EFIS control panel. The TEST pattern shows without any alert annunciations if these conditions exist:
*
PWS is on
*
Airplane is in the air.
The PWS symbol never shows in the TEST pattern. If PWS detects a real windshear threat while in TEST mode, the test stops. PWS then shows the actual display data and alert annunciations.
Training Information Point
The maintenance manual and the fault isolation manual do not have tasks for the WXR FAIL messages on the ND.
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WXR SYSTEM -SELF-TEST
Many LRUs on the 777 are compatible with other model airplanes that do not have a central maintenance computing system (CMCS). For this reason, the WXR system shows fail messages on the ND. Maintenance personnel should use the MAT to do a test of the WXR system.
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777 AIRCRAFT MAINTENANCE MANUAL
WXR SYSTEM -SELF-TEST
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WXR SYSTEM -FRONT PANEL TEST
Front Panel Self-Test
To do a self-test, select the WXR system for the test with the left/ right system switch on the WXR control panel. Push the test switch on the left side of the front panel of the RT. The LCD maintenance display shows the test results.
Training Information Point
The maintenance manual and the fault isolation manual do not have a task for the maintenance technician to do a test from the front panel of the WXR RT. You must do all tests for the WXR RT from the MAT, PMAT, or from the WXR panel.
Many LRUs on the 777 are compatible with other model airplanes that do not have a central maintenance computing system (CMCS). For that reason, these LRUs have a front panel test feature.
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WXR SYSTEM -FRONT PANEL TEST
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WXR SYSTEM -LRU REPLACEMENT TEST
General
The WXR system LRU replacement test does an internal check of WXR RT operations. This test also makes sure the WXR RT connections are good. This test does not do a detailed check of the WXR RT data inputs.
These are the LRU replacement tests for the weather radar system:
*
Left WXR system
*
Right WXR system.
Training Information Point
WARNING: DO NOT OPERATE THE WEATHER RADAR WHILE FUEL IS ADDED OR REMOVED FROM THE AIRPLANE. DO NOT TRANSMIT RF ENERGY WHILE FUEL IS ADDED OR REMOVED IN AN AREA 300 FEET OR LESS FROM THE ANTENNA. THIS CAN CAUSE AN EXPLOSION.
WARNING: MAKE SURE NO PERSONS ARE IN THE AREA 15 FEET OR LESS FROM THE ANTENNA WHEN IT TRANSMITS RF ENERGY. RF ENERGY CAN CAUSE INJURIES TO PERSONS.
Do not do a WXR system test in a hangar. Make sure the nose of the airplane points away from buildings, other aircraft or large metal objects.
Test Start
Follow the instructions on the MAT to start a WXR LRU replacement test.
Test Operation
There are no WXR test display patterns or other flight deck effects (FDEs) for a WXR LRU replacement test.
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