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AIM 

6/17/21 

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

4

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

 

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 

1

2

Performance

Based Navigation (PBN) and Area Navigation (RNAV)