777 AIRCRAFT MAINTENANCE MANUAL
ILS -TUNING
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ILS -AUDIO CONTROL PANEL ILS AUDIO CONTROLS
General
The audio control panels (ACPs) supply control inputs to the audio management unit. This lets the crew hear audio signals on the speakers and headsets in the flight deck.
Description
These are the controls on the audio control panel that let you hear ILS audio:
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NAV filter selector
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Approach receiver volume control
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Approach receiver selector.
NAV Filter Selector
The NAV filter selector lets you select one of these:
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Voice (V) audio
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Both (B) voice and range audio.
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Range (R) audio
Approach Receiver Volume Control
The approach receiver volume control turns on the audio and controls the volume.
Approach Receiver Selector
The approach receiver selector lets you select ILS or marker beacon as the source of audio.
Operation
To hear ILS audio, do this:
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Set the approach receiver selector to the left (L), center (C) or right (R) APP position
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Push the approach receiver volume control to turn on the ILS audio (turn the control to adjust the volume)
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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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ILS -AUDIO CONTROL PANEL ILS AUDIO CONTROLS
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ILS -CDU ILS TUNING
General
The CDUs supply manual tune inputs during normal operation and alternate tune inputs when the AIMS tune functions fail.
Operation
To see ILS tune frequencies, push the NAV RAD key on the CDU. The NAV RADIO page shows data for the ILS systems.
To manually tune the multi-mode receiver (MMR), enter a valid ILS frequency or identifier and course into the CDU scratch pad and push line select key 4L.
You can enter the frequency and course together or separately. When you enter the course separately, a diagonal slash must be entered first followed by the course.
The PARK display can show on the CDU when the FMCF of AIMS autotunes the receivers. PARK shows for these conditions:
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PARK shows when the ILS is part of the active flight plan and not tuned, and the airplane is more than 200 nm from top of descent, or less than halfway to the destination.
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The frequency and PARK shows when the ILS is part of the active flight plan and not tuned, and the airplane is less than 200 nm from top of descent, or greater than halfway to the destination.
When the FMCF tunes the frequency, only the frequency shows. The PARK display goes out of view when less than 50 nm from top of descent, greater than 150 nm from the runway threshold, or the FMC is in the descent mode.
To delete the frequency and course, push the delete (DEL) key on the CDU. The delete function shows in the CDU scratchpad. Next, push the line select key next to the ILS data line to delete the frequency and course.
Alternate Tune
The ALTN NAV RADIO page is available only when the tune inputs from the AIMS cabinets fail.
To get to 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 the left NAV radio systems. Normally, the left CDU ALTN NAV RADIO page controls the left NAV receivers. The right CDU NAV RADIO page controls the right NAV radio receivers. However, for ILS in alternate tune, the left CDU tunes the left and center MMRs. The right CDU tunes the right MMR.
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777 AIRCRAFT MAINTENANCE MANUAL
ILS -CDU ILS TUNING
EFFECTIVITY BEJ ALL 34-31-00
Page 43
D633W101-BEJ Jan 05/2002
ILS -EFIS ILS CONTROLS
General
To show ILS data on the ND, turn the mode selector to the APP position. The switch has a CTR push on, push off switch in the center. This switch changes the display format from the expanded format to the centered format.
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