787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Flight Instruments, Displays -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 10.10.11
Lateral and Vertical scales:
• outer white tic marks represent RNP. Center white tic mark represents
airplane position.
• the part of each bar extending from an outer tic mark toward the center tic
mark represents ANP
• area between bars indicates margin available to remain within RNP criteria
• if ANP value increases (navigation system performance decreases), the
bars become longer, extending toward the center white tic mark
• bars show on vertical scale only during FMC descent phase of flight
If ANP equals or exceeds RNP:
• the white bars meet in the middle
• after 5 seconds, the bars and scale turn amber indicating RNP operations
can no longer be maintained
• the NAV UNABLE RNP EICAS message is displayed
If pointer migrates into bar area for more than 5 seconds:
• scale and ANP bars turn amber
• pointer flashes for 10 seconds
3
Deviation Scales and Bars
August 14, 2009
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