*
Transmits RF pulses
*
Processes the RF returns
*
Supplies the WXR display data.
Interfaces
The WXR system interfaces with these systems:
*
Warning electronic system (WES)
*
Ground proximity warning system (GPWS)
*
Traffic alert and collision avoidance system (TCAS)
*
Radio altimeter (RA) system
*
Overhead panel ARINC 629 system (OPAS).
The WXR system interfaces with these system components:
*
Air/ground relay
*
Landing gear control lever module.
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777 AIRCRAFT MAINTENANCE MANUAL
WXR SYSTEM -GENERAL DESCRIPTION
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WXR SYSTEM -COMPONENT LOCATIONS -FLIGHT DECK
WXR System Components
The WXR system component on the flight deck is the weather radar panel.
WXR System Interface Components
The components that interface with the WXR system are:
*
Left EFIS control panel
*
Right EFIS control panel
*
Left control display unit (CDU)
*
Right CDU
*
Left navigation display (ND)
*
Right ND
*
Left primary flight display (PFD)
*
Right PFD
*
Master warning lights
*
Aural warning speakers
*
Landing gear control lever module.
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WXR SYSTEM -COMPONENT LOCATIONS -FLIGHT DECK
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WXR SYSTEM -COMPONENT LOCATIONS -FORWARD EQUIPMENT CENTER AND NOSE RADOME
General
The WXR antenna assembly is in the nose radome.
The WXR system components in the forward equipment center are the:
*
Left WXR RT
*
Waveguide switch
*
Right WXR RT.
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WXR SYSTEM -COMPONENT LOCATIONS -FORWARD EQUIPMENT CENTER AND NOSE RADOME
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WXR SYSTEM -INTERFACE -POWER, INTERLOCKS, ENABLES AND RF TRANSMISSION
System Power
The left WXR RT gets 115v ac through the left WXR circuit breaker from the left ac transfer bus (L AC XFR).
The right WXR RT gets 115v ac through the right WXR circuit breaker from the right ac secondary 2 bus (R AC SEC 2).
WARNING: MAKE SURE YOU OPEN THESE CIRCUIT BREAKERS FOR THE WEATHER RADAR SYSTEM BEFORE YOU RUN THE ENGINE. IF YOU DO NOT, YOU CAN CAUSE INJURY OR DEATH TO PERSONS AND DAMAGE TO EQUIPMENT.
The left and right WXR RTs send 28v dc to the onside power supply in the WXR panel.
Interlocks, Enables and RF Transmission
The left and right AIMS cabinets receives WXR on/off discrete inputs from the left and right EFIS CP or left, center, and right CDUs and sends the discrete to the WXR panel.
The WXR panel sends the ON/OFF discrete to the left and right RTs. This discrete permits the selected RT to operate.
The RTs send 28v dc to the WXR control panel for the power interlock (INTRLK) and RT ENABLE. The WXR CP RT ENABLE goes to the WXR RT to enable operation.
The RT ENABLE also causes the waveguide switch to connect the antenna to the selected RT. When the selected RT operates, it sends 28v to the WXR panel power supply to make the WXR panel operate.
The WXR antenna assembly gets 115v ac power from the WXR RTs.
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WXR SYSTEM -INTERFACE -POWER, INTERLOCKS, ENABLES AND RF TRANSMISSION
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WXR SYSTEM -PREDICTIVE WINDSHEAR INTERFACES
General Description
The predictive windshear (PWS) part of the weather radar (WXR) system interfaces with other airplane systems and components.
Radio Altimeter
The radio altimeter (RA) provides radio altitude data to PWS. PWS uses this data to do these functions:
*
Turn PWS on and off
*
Enable/disable display and alert functions.
Ground Proximity Warning Computer
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