AIM
8/15/19
1
−
2
−
6
Performance
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Based Navigation (PBN) and Area Navigation (RNAV)
target level of safety. RNP AR DP has lateral
accuracy values that can scale to no lower than RNP
0.3 in the initial departure flight path. Before
conducting these procedures, operators should refer
to the latest AC 90
−
101, Approval Guidance for RNP
Procedures with AR. (See paragraph 5
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4
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18.)
(4) Advanced RNP (A
−
RNP).
Advanced
RNP is a NavSpec with a minimum set of mandatory
functions enabled in the aircraft’s avionics suite. In
the U.S., these minimum functions include capability
to calculate and perform RF turns, scalable RNP, and
parallel offset flight path generation. Higher
continuity (such as dual systems) may be required for
certain oceanic and remote continental airspace.
Other “advanced” options for use in the en route
environment (such as fixed radius transitions and
Time of Arrival Control) are optional in the U.S.
Typically, an aircraft eligible for A
−
RNP will also be
eligible for operations comprising: RNP APCH,
RNP/RNAV 1, RNP/RNAV 2, RNP 4, and
RNP/RNAV 10. A
−
RNP allows for scalable RNP
lateral navigation values (either 1.0 or 0.3) in the
terminal environment. Use of these reduced lateral
accuracies will normally require use of the aircraft’s
autopilot and/or flight director. See the latest AC
90
−
105 for more information on A
−
RNP, including
NavSpec bundling options, eligibility determina-
tions, and operations approvals.
NOTE
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A
−
RNP eligible aircraft are NOT automatically eligible for
RNP AR APCH or RNP AR DP operations, as RNP AR
eligibility requires a separate determination process and
special FAA authorization.
(5) RNP 1.
RNP 1 requires a lateral
accuracy value of 1 for arrival and departure in the
terminal area, and the initial and intermediate
approach phase when used on conventional proce-
dures with PBN segments (for example, an ILS with
a PBN feeder, IAF, or missed approach). RF turn
capability is optional in RNP 1 eligibility. This means
that your aircraft may be eligible for RNP 1
operations, but you may not fly an RF turn unless RF
turns are also specifically listed as a feature of your
avionics suite.
(6) RNP 2.
RNP 2 will apply to both
domestic and oceanic/remote operations with a
lateral accuracy value of 2.
(7) RNP 4.
RNP 4 will apply to oceanic and
remote operations only with a lateral accuracy value
of 4. RNP 4 eligibility will automatically confer
RNP 10 eligibility.
(8) RNP 10.
The RNP 10 NavSpec applies
to certain oceanic and remote operations with a lateral
accuracy of 10. In such airspace, the RNAV 10
NavSpec will be applied, so any aircraft eligible for
RNP 10 will be deemed eligible for RNAV 10
operations. Further, any aircraft eligible for RNP 4
operations is automatically qualified for RNP 10/
RNAV 10 operations. (See also the latest AC 91
−
70,
Oceanic and Remote Continental Airspace Opera-
tions, for more information on oceanic RNP/RNAV
operations.)
(9) RNP 0.3.
The RNP 0.3 NavSpec
requires a lateral accuracy value of 0.3 for all
authorized phases of flight. RNP 0.3 is not authorized
for oceanic, remote, or the final approach segment.
Use of RNP 0.3 by slow
−
flying fixed
−
wing aircraft is
under consideration, but the RNP 0.3 NavSpec
initially will apply only to rotorcraft operations. RF
turn capability is optional in RNP 0.3 eligibility. This
means that your aircraft may be eligible for RNP 0.3
operations, but you may not fly an RF turn unless RF
turns are also specifically listed as a feature of your
avionics suite.
NOTE
−
On terminal procedures or en route charts, do not confuse
a charted RNP value of 0.30, or any standard final
approach course segment width of 0.30, with the NavSpec
title “RNP 0.3.” Charted RNP values of 0.30 or below
should contain two decimal places (for example, RNP 0.15,
or 0.10, or 0.30) whereas the NavSpec title will only state
“RNP 0.3.”
(b) Application of Standard Lateral Accu-
racy Values.
U.S. standard lateral accuracy values
typically used for various routes and procedures
supporting RNAV operations may be based on use of
a specific navigational system or sensor such as GPS,
or on multi
−
sensor RNAV systems having suitable
performance.
(c) Depiction of PBN Requirements.
In the
U.S., PBN requirements like Lateral Accuracy
Values or NavSpecs applicable to a procedure will be
depicted on affected charts and procedures. In the
U.S., a specific procedure’s Performance
−
Based
Navigation (PBN) requirements will be prominently
displayed in separate, standardized notes boxes. For
procedures with PBN elements, the “PBN box” will
contain the procedure’s NavSpec(s); and, if required:
specific sensors or infrastructure needed for the