777 AIRCRAFT MAINTENANCE MANUAL
WXR SYSTEM -LRU REPLACEMENT TEST
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WXR SYSTEM -SYSTEM TEST
Training Information Point
The weather radar (WXR) system transmits some pulses to let BITE monitor for correct operation. Do not do a test of the WXR system in a hangar. Make sure the nose of the airplane points away from buildings and other aircraft or large metal objects.
Test Preparation
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.
Test Start
Follow the instructions on the MAT to start a WXR system test.
Test Operation
These visual and aural annunciations show for a normal test:
*
Amber WINDSHEAR message on ND
*
Aural message -MONITOR RADAR DISPLAY
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Aural message -GO AROUND, WINDSHEAR AHEAD, (pause) WINDSHEAR AHEAD, WINDSHEAR AHEAD
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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.
Test Pass
For a valid self-test, PASSED must show adjacent to TEST CONDITION on the MAT. You must also see and hear all visual and aural annunciations.
Test Fail
For a self-test that fails, FAILED shows next to TEST CONDITION on the MAT. The test also fails if you do not see and hear all visual and aural annunciations.
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WXR SYSTEM -SYSTEM TEST
Training Information Point
The maintenance manual and the fault isolation manual do not have tasks for the WXR FAIL messages on the ND.
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. Use the MAT to do a test of the WXR system.
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777 AIRCRAFT MAINTENANCE MANUAL
WXR SYSTEM -SYSTEM TEST
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TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM -INTRODUCTION
General * WEU -warning electronic unit
* WXR -weather radar The traffic alert and collision avoidance system (TCAS) helps the flight crew and air traffic control maintain safe air traffic separation. TCAS is an airborne system. TCAS uses an air traffic control radar beacon system (ATCRBS) transponder or an ATC/Mode S transponder to track other airplanes. TCAS also coordinates maneuvers with other airplanes that have TCAS.
TCAS supplies a traffic display and visual and aural vertical commands to the flight crew. All commercial airlines and some general aviation airplanes have TCAS.
Abbreviations and Acronyms
*
ABS -absolute
*
ABV -above
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AIMS -airplane information management system
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ATC -air traffic control
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ATCRBS -air traffic control radar beacon system
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BITE -built-in-test equipment
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BLW -below
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CMCS -central maintenance computer system
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CPA -closest point of approach
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GPWC -ground proximity warning computer
*
PSEU -proximity switch electronics unit
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