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AIM

10/12/17

1

−2−7

Performance

−Based Navigation (PBN) and Area Navigation (RNAV)

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

−2−1

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

1

Terminal and En Route

1.0

2

En Route

2.0

4

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

1

−2−3. 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.

2/28/19

AIM