737 Flight Crew Operations Manual
Flight Instruments, Displays -
PFD/ND – Displays
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10.11.14 D6-27370-866-EGP
2 NPS Deviation Scale
• lateral NPS deviation scale represents current FMC lateral RNP
• vertical NPS deviation scale represents current FMC vertical RNP
• displayed if an approach mode is not engaged and either HDG SEL,
TO/GA, LNAV or any VNAV mode is engaged.
3 Anticipation Cues
• displayed if valid approach course deviation information is being
received while corresponding NPS deviation scale and pointer are
displayed
• an unfilled white diamond symbol.
• if engaged lateral mode subsequently transitions to LOC, lateral NPS
deviation indications will be removed, and normal ILS localizer
indications will be displayed
• if engaged vertical mode subsequently transitions to G/S, vertical NPS
deviation indications will be removed, and normal ILS G/S indications
will be displayed.
4 NPS Pointer
• a filled magenta symbol when it is not parked at deflection limit
• an unfilled pointer outline when at deflection limit
• indicates lateral/vertical paths relative to the airplane
• will flash for 10 seconds if deviation is within ANP bar limits for 5
continuous seconds.
5 Actual Navigation Performance (ANP) Bars
• lateral/vertical indication of available flight technical error remaining
based on total system error
• lateral ANP bars can be displayed in all phases of flight
• vertical ANP bars can be displayed only after reaching top-of-descent
• originate from outer scale and expand inward as a function of increasing
ANP relative to RNP
• will just touch at center of scale when ANP equals RNP
• turn from white to amber if current deviation is within the ANP bar
limits for 5 continuous seconds.
September 15, 2016
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