777 AIRCRAFT MAINTENANCE MANUAL
DME SYSTEM -TUNING
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777 AIRCRAFT MAINTENANCE MANUAL
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DME SYSTEM -AUDIO CONTROL PANEL
General
The audio control panels supply control inputs to the audio management unit. This lets the crew hear audio signals on the speakers and headsets in the flight deck.
DME Audio Pairing
The flight management computing function (FMCF) of AIMS can pair the DME station identifier audio with VOR station identifier audio, or with ILS station identifier audio.
The flight crew uses the EFIS control panels or the EFIS CONTROL page on the CDU to determine how to pair the DME audio. The flight crew selections go to the FMCF. The FMCF sends the DME pairing signal to the audio management unit (AMU). The AMU uses the pairing signal to pair the DME audio with ILS or VOR audio.
When the captain selects the approach (APP) ND mode on the left EFIS control panel or on the left CDU EFIS CONTROL page, the AMU pairs the left DME interrogator audio with the left multi-mode receiver (MMR) audio. When the captain selects the VOR, MAP, or PLAN mode, the AMU pairs the left DME interrogator audio with the left VOR receiver audio.
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When the first officer selects the approach (APP) ND mode on the right EFIS control panel or on the right CDU EFIS CONTROL page, the AMU pairs the right DME interrogator audio with the right MMR audio. When the first officer selects the VOR, MAP, or PLAN mode, the AMU pairs the right DME interrogator audio with the right VOR receiver audio.
Description
These are the controls on the audio control panel that let you hear DME audio:
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VOR/ADF receiver selector
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VOR/ADF receiver volume control
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NAV filter selector.
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Approach receiver volume control
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Approach receiver selector.
VOR/ADF Receiver Selector
The VOR/ADF receiver selector lets you select VOR or ADF as the source of audio. When the selector is in the VOR positions, you hear DME station identifier audio and VOR station 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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DME SYSTEM -AUDIO CONTROL PANEL
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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 volume control makes the audio come on and controls the volume for the approach (APP) selector.
Approach Receiver Selector
The approach receiver selector lets you select ILS or marker beacon as the source of audio.
When the selector is in the left (L) position, you hear audio from the left DME interrogator. The DME audio you hear is the DME station identifier audio that is paired with the multi-mode receiver (MMR) audio.
When the selector is in the right (R) position, you hear audio from the right DME interrogator. The DME audio you hear is the DME station identifier audio that is paired with the right MMR audio.
When the selector is in the center (C) position, you do not hear any DME audio. You only hear ILS station identifier audio from the center MMR.
Operation
Do this to hear DME or VOR/DME audio:
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Set the VOR/ADF receiver selector to the left (L) or right (R) VOR position
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Push the VOR/ADF receiver volume control to make the VOR audio come on (turn the control to adjust the volume)
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Set the NAV filter selector to the both (B) or range (R) position.
Do this to hear ILS/DME audio:
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Set the approach receiver selector to the left (L) or right (R) position
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Push the approach receiver volume control to make the ILS audio come on (turn the control to adjust the volume).
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