777 AIRCRAFT MAINTENANCE MANUAL
VOR -TUNE INPUTS
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VOR -AUDIO CONTROLS
General
The audio control panels supply control inputs to the audio management unit. This lets the crew hear audio on the speakers and headsets in the flight deck.
Description
These are the controls on the audio control panel that let you hear VOR audio:
*
VOR/ADF receiver selector
*
VOR/ADF receiver volume control
*
NAV filter selector.
VOR/ADF Receiver Selector
The VOR/ADF receiver selector lets you select ADF or VOR as the source of audio.
VOR/ADF Receiver Volume Control
The VOR/ADF receiver volume control turns on the audio and controls the volume.
NAV Filter Selector
The NAV filter selector lets you select one of these:
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Voice (V) audio
*
Both (B) voice and range audio.
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Range (R) audio
Operation
To hear VOR audio, do this:
*
Set the VOR/ADF receiver selector to the left (L) or right (R) VOR position
*
Push the VOR/ADF receiver volume control to turn on the ADF audio (turn the control to adjust the volume)
*
Set the NAV filter selector to the voice (V) position.
To hear the station identifier, set the NAV filter selector to either the both (B) or the range (R) position.
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777 AIRCRAFT MAINTENANCE MANUAL
VOR -AUDIO CONTROLS
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VOR -CDU TUNING
General
The CDUs supply manual tune inputs during normal operation and alternate tune inputs when the AIMS tune functions fail.
Operation
To see VOR tune frequencies, push the NAV RAD key on the CDU. The NAV RADIO page shows data for the left and right VOR systems.
To manually tune a VOR receiver, enter a valid VOR frequency or identifier into the CDU scratch pad. Push line select key 1L or 1R to enter the frequency for the left or right VOR receiver.
When you manually enter a VOR frequency, the letter M shows after the frequency.
The letter A shows after the frequency when the FMCF of AIMS autotunes the receivers.
To enter the selected course, enter the course into the CDU scratchpad. Push line select key 2L or 2R to enter the course for the left or right VOR receiver.
To delete the frequency or course, push the delete (DEL) key on the CDU. The delete function shows in the CDU scratchpad. Next, push the line select key (LSK) next to the applicable VOR data line.
Alternate Tune
The ALTN NAV RADIO page is available only when the tune inputs from the AIMS cabinets fail.
To access the ALTN NAV RADIO page, push the NAV RAD key on the CDU.
The ALTN NAV RADIO page is different than the NAV RADIO page. The ALTN NAV RADIO page shows data for only the onside NAV radio systems. The left CDU ALTN NAV RADIO page controls the left VOR receiver. The right CDU ALTN NAV RADIO page controls the right VOR receiver.
You enter a VOR frequency and selected course the same as you do for normal manual tuning.
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777 AIRCRAFT MAINTENANCE MANUAL
VOR -CDU TUNING
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VOR -EFIS CONTROLS
General
The EFIS control panel has controls to select the display mode of the ND. These are the EFIS controls that cause VOR displays to show:
*
Navigation display mode selector
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