777 AIRCRAFT MAINTENANCE MANUAL
WXR SYSTEM -ANTENNA CONTROL INTERFACE
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WXR SYSTEM -MAINTENANCE INTERFACES
RT Central Maintenance Computer System Interface
The central maintenance computer system (CMCS) of the left AIMS cabinets sends this data to the left and right WXR RTs:
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Flight legs for the RT nonvolatile memory (NVM)
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Ground test commands to start a WXR system test.
WXR System Maintenance Data
The WXR RTs send WXR system maintenance data to the CMCS in the left and right AIMS cabinets.
Air/Ground
The air/ground relay input does these functions:
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Inhibits PWS test alerts in the air
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Defines flight legs if the flight legs data from the CMCS fails.
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777 AIRCRAFT MAINTENANCE MANUAL
WXR SYSTEM -MAINTENANCE INTERFACES
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WXR SYSTEM -WEATHER RADAR PANEL
Purpose
The weather radar (WXR) panel has controls for WXR system operation.
Mode Selector
The mode selector has these positions:
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TEST -lets the flight crew do a self-test of the RT in operation and shows the test results on the ND. Line maintenance personnel should use the MAT to do a test of the WXR system.
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WX -selects the weather mode
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WX/TURB -selects the weather and turbulence mode (the RT processes turbulence returns for a maximum of 40 nm only)
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MAP -selects the ground map mode.
System Select Switch
/The system select switch has two positions that let you select the left (L) or right (R) WXR RT for operation.
Tilt Control
The tilt control lets you adjustment the antenna tilt angle from +15 degrees to -15 degrees.
Gain Control
The gain control adjusts the gain for the WXR RT signal returns. In the AUTO position, the gain is set to a calibrated level by the RT. When you rotate the gain adjust out of the AUTO position, you can manually adjust the gain.
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777 AIRCRAFT MAINTENANCE MANUAL
WXR SYSTEM -WEATHER RADAR PANEL
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WXR SYSTEM -RECEIVER-TRANSMITTER
Purpose
This is the purpose of the WXR receiver-transmitter (RT):
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Make and transmit RF pulses
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Process RF return signals
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Make display data
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Send display data to the AIMS
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Supply antenna stabilization
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Monitor and test system operation
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Send and record fault status and test results
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Make WXR display test patterns to show on the display units.
Physical Description
The WXR RT weighs 29.5 lb (13.4 kg). Forced air cools the RT.
Test Equipment Connectors
There is a shop test connector on the front panel of the RT. To get access to the test connector, remove the cover plate.
Front Panel
There is an LCD maintenance display on the front of the RT. The maintenance display shows WXR system test and fault information. You use the test switches on the front of the RT to start a test of the WXR RT.
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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