The waveguide switch has an electrical connection that enables the switch operation. A discrete signal from the WXR control panel causes the switch to operate.
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777 AIRCRAFT MAINTENANCE MANUAL

WXR SYSTEM -RF SWITCHING

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WXR SYSTEM -CONTROL -EFIS CONTROL PANEL

EFIS Control Panel
These are the functions of the EFIS control panel for WXR control:
*
Supplies the on and off control of the WXR RTs

*
Enables the NDs to show WXR data

*
Supplies the selection of different ND modes

*
Supplies the selection of different ranges for WXR data to show on the NDs.

WXR Map Switch
When you push the WXR map switch on the EFIS control panel:
*
The WXR RT selected on the WXR panel starts to operate

*
The WXR data shows on the onside ND.

To stop the operation of the WXR RT, the WXR switches on both EFIS control panels and the WXR selections on the CDUs must be off.
ND Mode Selector
Use the mode selector switch to select an ND mode. The ND modes that show a WXR display are:
*
Expanded APP (approach) mode

*
Expanded VOR mode

*
Expanded MAP mode

*
Centered MAP mode.

If the mode selector is not in a correct mode when you push the WXR map switch, the weather display arms. When armed, the weather display shows as soon as you change the ND selector to a correct mode. The weather display stays armed even if you push the WXR map switch again.
ND Range Selector
The EFIS control panel has a six position range selector. The range selections are 10, 20, 40, 80, 160, 320 and 640 NM. With the 640 NM range selection, the 640 NM range shows on the ND, but the WXR RT only shows weather displays out to its maximum range of 320 NM.
The MAP mode shows the range at all times. The APP and VOR modes show the range only when the WXR is on.
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777 AIRCRAFT MAINTENANCE MANUAL

WXR SYSTEM -CONTROL -EFIS CONTROL PANEL

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WXR SYSTEM -CDU SELECTIONS

Alternate or Backup EFIS Control Panel
The EFIS control page on the control display unit (CDU) permits alternate or backup controls for the WXR system.
If the EFIS CP fails or for alternate operation, use the EFIS control CDU pages on the onside CDU for:
*
On/off power control of the WXR system

*
On/off control of the onside WXR display

*
WXR range selection

*
ND mode selection.

When you select EFIS control to ON from the CDU page, the onside EFIS CP does not operate.
Access
To get the EFIS control CDU pages on the CDU:
*
Push the MENU line select key (LSK) on the CDU to make the MENU page come on

*
Push the EFIS CTL LSK on the MENU page and the EFIS prompt comes on

*
Push the LSK next to EFIS and the EFIS control page comes on

*
Select the ND modes and range From the EFIS CONTROL page

*
Push the OPTIONS LSK on the EFIS CONTROL page to go to the EFIS OPTIONS page

*
Push the WXR LSK on the EFIS OPTIONS page for ON/OFF control of the WXR system and to enable the WXR display for the onside ND.

*
Push the CONTROL LSK on the EFIS OPTIONS page to return to the EFIS CONTROL page.

You can use the EFIS CP CDU pages on the CDU at anytime, but normally the EFIS CP supplies the control for the WXR system.
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WXR SYSTEM -CDU SELECTIONS

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WXR SYSTEM -NORMAL DISPLAYS

Display Modes
The ND shows WXR system data in these modes:
*
Expanded approach mode

*
Expanded VOR mode

*
Centered MAP mode

*
Expanded MAP mode.

Each ND mode has a range selection for 10, 20, 40, 80, 160, 320, or 640 NM. Use the EFIS CP to select the mode and range for the ND.
WXR System Display Data
For the WXR system, the ND shows this information:
*
WXR displays

*
WXR system messages

*
WXR alert messages.

WXR Displays
The WXR displays on the ND show the weather in front of the airplane or the terrain below. The WXR display shows in four colors. These colors represent the strength of the RF return signals from the weather or the terrain. These are the four colors for the WXR displays:
　
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