777 AIRCRAFT MAINTENANCE MANUAL
DME SYSTEM -AUDIO CONTROL PANEL
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DME SYSTEM -MANUAL AND ALTERNATE TUNING
General
The CDUs supply manual tune inputs during normal operation and alternate tune inputs when the AIMS tune inputs fail.
Since DME stations are normally paired with VOR or ILS stations, to tune the DME interrogators, you enter a VOR or ILS frequency. You can also tune DME stations that are not paired with VOR or ILS stations.
Operation
To see DME frequencies and DME/VOR or DME/ILS paired frequencies, push the NAV RAD key on the CDU. The NAV RADIO page shows data for the NAV radios.
To manually tune a DME interrogator, enter a valid VOR or ILS frequency or identifier into the scratch pad. Push the line select key to enter the frequency for the applicable data line. To tune an unpaired DME frequency, enter the VOR frequency into the VOR data line for the left or right VOR system.
When you manually enter a VOR frequency, the letter M shows after the frequency.
The letter A shows after the VOR frequency when the FMCF of AIMS autotunes the frequency.
To delete the frequency, push the delete (DEL) key on the CDU. The delete function shows in the CDU scratchpad. Next, line select the delete function to the applicable VOR data line.
Alternate Tuning
The ALTN NAV RADIO page is available only when the tune inputs from the AIMS cabinets fail.
To get access to the ALTN NAV RADIO page, push the NAV RAD key on the CDU.
The ALTN NAV RADIO page is different from the NAV RADIO page. The ALTN NAV RADIO page shows data for only the left or right NAV radios. The left CDU ALTN NAV RADIO page controls the left NAV receivers and the right CDU ALTN NAV RADIO page controls the right NAV receivers.
You enter a VOR or ILS frequency the same as you do for normal manual tuning.
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777 AIRCRAFT MAINTENANCE MANUAL
DME SYSTEM -MANUAL AND ALTERNATE TUNING
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DME SYSTEM -EFIS CONTROLS
General
The EFIS control panel has controls to select DME data to show on the navigation displays (NDs).
Navigation Display Mode Selector
You use the navigation display mode selector to select the display mode on the NDs. DME data shows in all modes except plan (PLN) mode.
Alternate or Backup EFIS Control Panel
The EFIS control page on the CDU supplies backup controls for the EFIS control panel. You can use the EFIS control page to select the display mode for the NDs.
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777 AIRCRAFT MAINTENANCE MANUAL
DME SYSTEM -EFIS CONTROLS
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DME SYSTEM -PRIMARY FLIGHT DISPLAY
Normal Display
The primary flight display (PFD) format shows the ILS/DME distance when you tune the onside DME to a paired ILS frequency and when the onside DME distance is valid.
The left PFD shows left DME data. The right PFD shows right DME data. The DME distance display shows in white letters and numbers.
DME NCD and Fail Displays
Dashes replace the DME distance when the DME distance data is no computed data (NCD). If the DME fails, the DME flag replaces the DME distance. Both the NCD and fail flag show in amber.
Only the onside DME distance shows on the PFDs. The left DME distance shows only on the captain’s PFD. The right DME distance shows only on the first officer’s PFD. If the left DME distance is NCD, dashes shows on the captain’s PFD. If the left DME fails, a DME flag shows on the captain’s PFD. The same occurs for the first officer’s PFD if the right DME is NCD or fails.
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777 AIRCRAFT MAINTENANCE MANUAL
DME SYSTEM -PRIMARY FLIGHT DISPLAY
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DME SYSTEM -ND APPROACH MODE DISPLAY
DME Normal Displays
The ILS/DME data shows on the ND in the centered and expanded approach (APP) modes. DME distance shows in the upper right corner of the ILS display when the onside DME is tuned to a paired ILS frequency, and the onside DME distance is valid.
DME NCD or Failed Displays.
Dashes replace digits when the DME distance is NCD. If the DME fails, an amber DME flag replaces the DME distance.
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