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AIM

10/12/17

1−2−6

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

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−

service NDB.

2. Use of a suitable RNAV system as an

Alternate Means of Navigation when  a VOR, DME,

VORTAC, VOR/DME, TACAN, NDB, or compass

locator facility including locator outer marker and

locator middle marker is operational and the

respective aircraft is equipped with operational

navigation equipment that is compatible with

conventional navaids. For example, if equipped with

a suitable RNAV system, a pilot may fly a procedure

or route based on operational VOR using that RNAV

system without monitoring the VOR.

NOTE−

1. Additional information and associated requirements

are available in Advisory Circular 90-108 titled “Use of

Suitable RNAV Systems on Conventional Routes and

Procedures.”
2. Good planning and knowledge of your RNAV system are
critical for safe and successful operations.
3. Pilots planning to use their RNAV system as a substitute
means of navigation guidance in lieu of an out−of−service

NAVAID

 may need to advise ATC of this intent and

capability.
4. The navigation database should be current for the
duration of the flight. If the AIRAC cycle will change
during flight, operators and pilots should establish
procedures to ensure the accuracy of navigation data,
including suitability of navigation facilities used to define
the routes and procedures for flight.  To facilitate validating
database currency, the FAA has developed procedures for
publishing the amendment date that instrument approach
procedures were last revised. The amendment date follows
the amendment number, e.g., Amdt 4 14Jan10. Currency of
graphic departure procedures and STARs may be
ascertained by the numerical designation in the procedure
title. If an amended chart is published for the procedure, or
the procedure amendment date shown on the chart is on or
after the expiration date of the database, the operator must
not use the database to conduct the operation.

b. Types of RNAV Systems that Qualify as a

Suitable RNAV System. When installed in accord-

ance with appropriate airworthiness installation

requirements and operated in accordance with

applicable operational guidance (for example,

aircraft flight manual and Advisory Circular