连续下降最终进近 Continuous Descent Final Approach (CDFA)(4)

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of LNAV capabilities of earliest FMCs – early 1980s
● For Boeing airplanes, RNAV capability is provided by the FMC:
f
– Airplane position and performance calculations
– Multi-sensor updating capability (GPS, DME, VOR, LOC)
– Inertial back up provided when no radio or GPS updating is available
– Ability to provide LNAV guidance for the autopilot and
flight director

Airplane Equipment Supports RNAV

Continuous Descent Final Approach
The - Improvements
Future Technology ● RNAV - Concept
● RNAV (GPS)
● RNAV (RNP)
● IAN
● GLS
● SAAAR / AR

The Future – RNAV (GPS)
● Question
– Are Boeing airplanes capable to fly GPS approaches?
● Answer
– approaches FMC can fly stand alone GPS approaches, if they are in the
navigation data base
– All RNAV (GPS) approaches can be flown using RNP

GPS
Stand Alone

RNAV (GPS)

RNAV (GPS)
● GPS approaches can be flown with RNP-capable FMCs
d i i i d
● GPS updating is required
● RNP 0.3 must be verified or manually entered prior to
commencing the approach
y p

Continuous Descent Final Approach
The - Improvements
Future Technology ● RNAV - Concept
● RNAV (GPS)
● RNAV (RNP)
● IAN
● GLS
● SAAAR / AR

The Future – RNAV (RNP)
● RNP – Required Navigation Performance
– Specified navigation accuracy for a route or departure/
approach procedure in NM units
● ANP – Actual Navigation p g y p
Performance
– The FMC-calculated certainty of the airplane’s
position in NM units

RNP is Being Added to RNAV
The airspace system is transitioning from ground-based RNAV
(DME-DME, etc.) to satellite-based RNAV using GPS
● RNP is being added to RNAV procedures to address varying
multi-sensor capabilities of RNAV systems
● Ability to tailor procedures to varied capabilities
(performance-based)
● Increased traffic capacity en-route
SIDs ● SIDs, STARs and approaches

Why RNP?
● Required Navigation Performance, or RNP, was developed as a method for certifying the navigation capability for RNAV
h l i l VOR DME GPS )
systems that can use multiple sensors (VOR, DME, GPS, etc.)
for position updating
● RNP is used as a criteria for design of terminal area
procedures and en-route segments
● RNP relates to obstacle clearance and/or traffic separation
criteria
BOEING is a trademark of Boeing Management Company.
Copyright © 2007 Boeing. All rights reserved. CDFA.53
Typical minimum Demonstrated RNP
Values (With GPS Update)
LNAV + A/P LNAV + F/D Map, No F/D
　
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