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6/17/21 

AIM 

navigation solution, any additional or advanced 
functional requirements, the minimum RNP value, 
and any amplifying remarks. Items listed in this PBN 
box are REQUIRED to fly the procedure’s PBN 
elements. For example, an ILS with an RNAV missed 
approach would require a specific capability to fly the 
missed approach portion of the procedure. That 
required capability will be listed in the PBN box. The 
separate Equipment Requirements box will list 
ground

based equipment and/or airport specific 

requirements. On procedures with both PBN 
elements and ground

based equipment require-

ments, the PBN requirements box will be listed first. 
(See FIG 5

4

1.) 

c.  Other RNP Applications Outside the U.S. 

The FAA and ICAO member states have led 
initiatives in implementing the RNP concept to 
oceanic operations. For example, RNP

10 routes 

have been established in the northern Pacific 
(NOPAC) which has increased capacity and 
efficiency by reducing the distance between tracks 
to 50 NM. (See paragraph 4

7

1.) 

d.  Aircraft and Airborne Equipment Eligibility 

for RNP Operations.

 Aircraft eligible for RNP 

operations will have an appropriate entry including 
special conditions and limitations in its AFM, 
avionics manual, or a supplement. Operators of 
aircraft not having specific RNP eligibility state-
ments in the AFM or avionics documents may be 
issued operational approval including special condi-
tions and limitations for specific RNP eligibilities. 

NOTE

 

Some airborne systems use Estimated Position Uncertain-
ty (EPU) as a measure of the current estimated 
navigational performance. EPU may also be referred to as 
Actual Navigation Performance (ANP) or Estimated 
Position Error (EPE). 

TBL 1

2

U.S. Standard RNP Levels 

RNP Level 

Typical Application 

Primary Route 

Width (NM) 

 

Centerline to 

Boundary 

0.1 to 1.0 

RNP AR Approach Segments 

0.1 to 1.0 

0.3 to 1.0 

RNP Approach Segments 

0.3 to 1.0 

Terminal and En Route 

1.0 

En Route 

2.0 

Projected for oceanic/remote areas where 30 NM horizontal 

separation is applied. 

4.0 

10 

Oceanic/remote areas where 50 NM lateral separation is 

applied. 

10.0 

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3.  Use of Suitable Area Navigation 

(RNAV) Systems on Conventional 
Procedures and Routes 

a.  Discussion. 

This paragraph sets forth policy, 

while providing operational and airworthiness 
guidance regarding the suitability and use of RNAV 
systems when operating on, or transitioning to, 
conventional, non

RNAV routes and procedures 

within the U.S. National Airspace System (NAS): 

1. 

Use of a suitable RNAV system as a 

Substitute Means of Navigation when a Very

High 

Frequency (VHF) Omni

directional Range (VOR), 

Distance Measuring Equipment (DME), Tactical Air 
Navigation (TACAN), VOR/TACAN (VORTAC), 
VOR/DME, Non

directional Beacon (NDB), or 

compass locator facility including locator outer 
marker and locator middle marker is out

of

service 

(that is, the navigation aid (NAVAID) information is 
not available); an aircraft is not equipped with an 
Automatic Direction Finder (ADF) or DME; or the 
installed ADF or DME on an aircraft is not 
operational. For example, if equipped with a suitable 
RNAV system, a pilot may hold over an out

of

ser-

vice NDB. 

Performance

Based Navigation (PBN) and Area Navigation (RNAV) 

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