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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.
2.2.1.3Depiction of Standard RNP Levels.The
applicable RNP level will be depicted on affected
charts and procedures.
TBL ENR 1.12−1
U.S. Standard RNP Levels
RNP Level Typical Application Primary Route Width (NM) −
Centerline to Boundary
0.1 to 1.0 RNP SAAAR 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
NOTE−
1.The performance" of navigation in RNP refers not only to the level of accuracy of a particular sensor or aircraft
navigation system, but also to the degree of precision with which the aircraft will be flown.
2.Specific required flight procedures may vary for different RNP levels.
AIP ENR 1.18−5
United States of America 15 MAR 07
Federal Aviation Administration Nineteenth Edition
TBL ENR 1.12−2
RNP Levels Supported for International Operations
RNP Level Typical Application
4 Projected for oceanic/remote areas where 30 NM horizontal separation is applied
10 Oceanic/remote areas where 50 NM lateral separation is applied
2.3 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 TBL ENR 1.12−2.)
2.4 Aircraft and Airborne Equipment Eligibility
for RNP Operations. Aircraft meeting RNP criteria
will have an appropriate entry including special
conditions and limitations in its Aircraft Flight
Manual (AFM), or supplement. Operators of aircraft
not having specific AFM−RNP certification may be
issued operational approval including special conditions
and limitations for specific RNP levels.
NOTE−
Some airborne systems use Estimated Position
Uncertainty (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).
3. Use of Suitable Area Navigation (RNAV)
Systems on Conventional Procedures and
Routes
3.1 Discussion. This paragraph sets forth policy
concerning the operational use of RNAV systems for
the following applications within the U.S. National
Airspace System (NAS):
3.1.1 When a very−high frequency omni−directional
range (VOR), DME, tactical air navigation
(TACAN), VORTAC, VOR/DME, nondirectional
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 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. This
category of use is referred to as “substitute means of
navigation.”
3.1.2 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 RNAV equipment but not monitor the VOR.
This category of use is referred to as “alternate means
of navigation.”
NOTE−
1. Additional information and associated requirements
are available via a 90−series Advisory Circular 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.
3.2 Types of RNAV Systems that Qualify as a
Suitable RNAV System. When installed in accordance
with appropriate airworthiness installation
requirements and operated in accordance with
applicable operational guidance (e.g., aircraft flight
manual and Advisory Circular material), the
following systems qualify as a suitable RNAV
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