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• 737-3/4/500 FMC U7.1 or later
• 737-6/7/8/900/BBJ All
• 747-400 FANS (FMC Load 11 or later)
• 757/767 Pegasus
• 777 All
[All FMCs that show RNP/ANP]
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FMC-provided RNPs
• The FMC provides the RNP for the current route
segment or terminal area procedure from the navigation
data base if available
• If no RNP is available from the navigation data base, the
FMC provides a default value according to the current
phase of navigation:
– Approach 0.5 or 0.3 NM
– Terminal (below 15,000’) 1.0 NM
– En-route (domestic) 2.0 NM
– Oceanic 12.0 NM
• The operator may select different default values
• If no RNP is specified for a route segment or terminal
area procedure, the FMC default value is normally
acceptable
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Procedure or Route-Specific RNPs
are Indicated on Charts
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Procedure or Route-Specific RNPs
are Indicated on Charts
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RNP for GPS Approaches
• GPS approaches can be flown with RNP-capable
FMCs
• GPS updating may also be required
• RNP 0.3 must be used and is normally manually
entered prior to commencing the approach
• Some operators have selected RNP 0.3 as the
approach default value to eliminate the need to
make this entry
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More About RNP & ANP
• ANP does not relate to course tracking accuracy!
• When ANP exceeds RNP the airplane position accuracy is
in question
• Smaller RNPs require more accurate FMC updating sources
(DME-DME, GPS, etc)
• When ANP exceeds RNP, the airplane’s actual navigation
position does not meet the required accuracy and a crew
alert is provided
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Crew Alerting Occurs When ANP
Exceeds RNP
• 757/67/77/47 – Caution level EICAS alert message during
the approach phase, advisory level at other times
– 777: NAV UNABLE RNP
– 757/767: UNABLE RNP
– 747-400: UNABLE RNP
• 737: UNABLE REQD NAV PERF-RNP displayed on
Navigation Display during the approach phase, FMC
scratchpad message at other times
• 737: Loss of GPS updating may not result in an RNP alert
for some period of time since the ANP will change gradually.
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Course Tracking Accuracy
• Observe the relationship of the airplane symbol and track
line to the FMC course on the map display, and
• Observe the cross-track error on the FMC PROGRESS
page 2
• Use of the autopilot in LNAV is normally the best method
to ensure proper course tracking!
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Response to an UNABLE RNP Alert
• Verify position using radar or other available
navaids
• If on an RNP route segment or RNP terminal area
procedure:
– Notify ATC immediately
– Make an immediate missed approach if on an
RNP approach
– Request an amended (non-RNP) clearance
• If on the ground, a realignment is needed
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VERIFY RNP FMC Message
• This message occurs to alert the crew that the
manual RNP entry exceeds the default RNP or the
RNP from the navigation data base, if available
• The crew must confirm the RNP entry
• If required, delete the manually entered RNP to use
the FMC default value or the RNP from the
navigation data base, if available
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VNAV Approach Topics
• Types of approaches that are VNAV compatible
• Types of approaches that are not VNAV compatible
• Use of Decision Altitudes (DA(H)) versus Minimum
Descent Altitudes (MDA(H))
• VNAV-related changes to charted approaches and
navigation data bases
• FMC “on-approach” logic
• Flying the approach
• Other approach-related topics
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Types of Approaches that are
VNAV Compatible
• Non-ILS approach procedures such as RNAV, GPS,
VOR, NDB, LOC, LOC-BC, SDF, etc. that have one
or more of the following:
– An appropriate path that has a missed approach
point at or before the runway threshold
– There is a glide path (GP) angle indicated on the
chart and/or shown on the legs page
– Approaches with a published VNAV DA(H)
Note: Many approaches are coded with a GP angle
which the charted Jeppesen procedure does not
show
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