777 AIRCRAFT MAINTENANCE MANUAL
DME SYSTEM -ND APPROACH MODE DISPLAY
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DME SYSTEM -MAP MODE DISPLAY
General
The DME distance shows in all ND modes except PLAN. With the EFIS control panel mode selector set to the MAP mode and the VOR/ADF switches in the VOR position, the ND shows slant range distance of the paired DME stations.
Distance Display
For DME distance less than 99.5 nm, the distance shows in tenths of an nm. For DME distances of 99.5 nautical miles (nm) or greater, the distance shows to the nearest 1 nm.
NCD or Invalid Displays.
Dashes replace digits when the DME distance data is NCD. A DME flag replaces the DME distance when DME fails.
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777 AIRCRAFT MAINTENANCE MANUAL
DME SYSTEM -MAP MODE DISPLAY
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DME SYSTEM -VOR MODE DISPLAY
DME Normal Displays
The VOR/DME data shows on the ND in center or expanded VOR modes. DME distance shows in the upper right corner of the VOR display when the onside DME is tuned to a paired VOR frequency, and the onside DME distance is valid.
When the VOR/ADF switches are in the VOR position the DME distance for a paired VOR station shows in the lower corners.
DME NCD or Failed Displays.
Dashes replace digits when the DME distance is NCD. If the DME fails, a DME flag replaces the DME distance.
DME distance shows only on the upper right corner of the onside VOR mode display. The left DME distance shows only on the captain VOR mode. The right DME distance shows only on the first officer VOR mode. If the left DME distance is NCD, dashes shows on the upper right corner captain VOR mode. If the left DME fails, a DME flag shows on the upper right corner of the captain VOR mode. The same occurs for the first officer VOR mode if the right DME is NCD or fails.
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777 AIRCRAFT MAINTENANCE MANUAL
DME SYSTEM -VOR MODE DISPLAY
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DME SYSTEM -TEST DISPLAYS
General
During a ground test or a self test, the onside PFD and ND show:
*
The DME fail condition for two seconds
*
The DME NCD condition for the next two seconds
*
The DME normal condition to end the test.
The DME normal condition is the distance that shows before the test starts.
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777 AIRCRAFT MAINTENANCE MANUAL
DME SYSTEM -TEST DISPLAYS
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DME SYSTEM -SIGNAL PROCESSING
CDU and AIMS Inputs
The right AIMS cabinet is the normal source for tune inputs. It supplies both manual tune inputs from the CDUs and autotune inputs from the FMCF.
The CDU sends a frequency source select discrete to the CPU when the CDU detects an AIMS tune output fail condition. When the CPU receives the discrete, it changes the input from the right AIMS cabinet to the CDU.
The CDU sends direct tune inputs when the CDU is in alternate tune mode.
The left AIMS cabinet sends data on the left CMCF bus. The CMCF data is for:
*
Test commands
*
Flight legs data.
Discrete Inputs
The source destination identifier (SDI) program pin inputs identify if the interrogator is in the left or right DME system.
The air/ground relay supplies a discrete to inhibit a DME test in the air. The discrete also supplies flight leg data if the left AIMS cabinet flight leg data fails.
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