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RNP concept has continued to evolve outside ICAO
􀀴 RTCA/EUROCAE defined performance and functional
requirements
􀀴 Industry ‘s RNP requires performance monitoring and alerting
Conflict
􀀴 Current ICAO concept does not require performance and
alerting
􀀴 Now we have two RNP concepts.
7
Are we now going the right way?
RNP
B-RNAV
P-RNAV
US-RNAV
RNP10
RNP 4
P
RES
E
NT
RNP/RNAV
Boeing
Europe
US
Australia
Canada
South
America
China
Japan
Airbus
F
UT
URE
Not safe, not efficient, costly, confusing
8
ICAO Recognizes the problems
􀀴 Need for focal point in ICAO to address problems
experienced with RNP Concept (GNSSP/4
recommendation 1/1)
􀀴 ANC (163/9) approves establishment of Navigation Performance Special coordinating group
Required
operational
requirements Study Group (RNPSORSG) as
9
What needs to be
done
􀀴 Original RNP concept in principle good, however…
􀀴 Adjustment to the RNP concept required.
􀂾 Clear distinction between operations that require
performance monitoring and alerting and operations that
don’t require
􀂾 Harmonization of current RNAV and RNP operations
􀂾 Development of new navigation specification to meet
operational demand.
􀂾 Need for clear operational approval requirements
􀂾 Clear implementation guidance
10
Agreeing PBN
􀀴 PBN specifies RNAV system performance i.e. accuracy,
integrity, continuity, availability + functionality; - written
up in navigation specifications
RNP X specifications RNAV X specifications
Require on-board
performance monitoring
+ alerting
Do not require on-board
performance monitoring
+ alerting
This is different than the
RNP concept, which
stressed navigation
accuracy and ‘stopped’ at
required performance.
However, PBN is anchored
in detailed navigation
specifications, which
contain performance and
functionality requirements.
11
Harmonization of existing navigation
specifications
Area of
Application Nav
accuracy
Designation of
navigation standard:
Current situation
Designation of
navigation
specification:
PBN concept
(new)
Oceanic/
Remote
10 RNP 10 RNAV 10
(RNP 10 label)
4 RNP 4 RNP 4
EnRoute-
Continental 5
RNP 5
Basic RNAV RNAV 5
En Route -
Continental
and Terminal
2 USRNAV type A RNAV 2
Terminal 1
USRNAV type B and
P-RNAV RNAV 1
Simplification
results in lower
costs for
Operators and ANSP
12
Harmonization of RNAV operations not
covered by existing nav specs
Area of
Application
Nav
accuracy
(NM)
Designation of
navigation standard:
Current situation
Designation of
navigation
specification:
PBN concept
(new)
Terminal 1
Basic-GNSS
SBAS Basic-RNP 1
Approach 1-0.3 Basic-GNSS
(Baro-VNAV)
SBAS
RNP APCH
Approach
RNP SAAAR (US)
1-0.1 RNP AR APCH
13
Harmonization of existing RNAV
operations not covered by navigation
specifications
Area of
Application
Nav
accuracy
(NM)
Designation of
navigation standard:
Current situation
Designation of
navigation
specification:
PBN concept
(new)
Terminal 1
Basic-GNSS
SBAS Basic-RNP 1
Approach 1-0.3 Basic-GNSS
(Baro-VNAV)
SBAS
RNP APCH
Approach
RNP SAAAR (US)
1-0.1 RNP AR APCH
􀂾 RNP approach for lowest common
denominator
􀂾 Meets RNP0.3 in final segment
􀂾 Basic GNSS/SBAS
􀂾 Functionalities: VNAV optional
􀂾 No Special authorization required
14
Harmonization of existing RNAV
operations not covered by navigation
specifications
Area of
Application
Nav
accuracy
(NM)
Designation of
navigation standard:
Current situation
Designation of
navigation
specification:
PBN concept
(new)
Terminal 1
Basic-GNSS
SBAS Basic-RNP 1
Approach 1-0.3 Basic-GNSS
(Baro-VNAV)
SBAS
RNP APCH
Approach
RNP SAAAR (US)
1-0.1 RNP AR APCH
􀂾 RNP approach for lowest common
　
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