following systems qualify as a suitable RNAV
system:

1. An RNAV system with TSO-C129/
-C145/-C146 equipment, installed in accordance
with AC 20-138, Airworthiness Approval of Global
Positioning System (GPS) Navigation Equipment for
Use as a VFR and IFR Supplemental Navigation
System, or AC 20-130A, Airworthiness Approval of
Navigation or Flight Management Systems Integrat-

ing Multiple Navigation Sensors, and authorized for

instrument flight rules (IFR) en route and terminal

operations (including those systems previously
qualified for "GPS in lieu of ADF or DME"
operations), or

2. An RNAV system with DME/DME/IRU
inputs that is compliant with the equipment
provisions of AC 90-100A, U.S. Terminal and
En Route Area Navigation (RNAV) Operations, for
RNAV routes. A table of compliant equipment is
available at the following website:
h t t p : / / w w w. f a a . g o v / a b o u t / o f f i c

headquarters_offices/avs/offices/afs/afs400/afs47

0/policy_guidance/

NOTE-
Approved RNAV systems using DME/DME/IRU, without
GPS/WAAS position input, may only be used as a substitute

means of navigation when specifically authorized by a

Notice to Airmen (NOTAM) or other FAA guidance for a

specific procedure. The NOTAM or other FAA guidance

authorizing the use of DME/DME/IRU systems will also
identify any required DME facilities based on an FAA
assessment of the DME navigation infrastructure.

c. Uses of Suitable RNAV Systems. Subject to

the operating requirements, operators may use a
suitable RNAV system in the following ways.

1. Determine aircraft position relative to, or
distance from a VOR (see NOTE 6 below), TACAN,
NDB, compass locator, DME fix; or a named fix
defined by a VOR radial, TACAN course, NDB
bearing, or compass locator bearing intersecting a
VOR or localizer course.

2. Navigate to or from a VOR, TACAN, NDB,

or compass locator.

3. Hold over a VOR, TACAN, NDB, compass
locator, or DME fix.

4. Fly an arc based upon DME.

NOTE-
1. The allowances described in this section apply even
when a facility is identified as required on a procedure (for
example, "Note ADF required").
2. These operations do not include lateral navigation on
localizer-based courses (including localizer back-course
guidance) without reference to raw localizer data.

3. Unless otherwise specified, a suitable RNAV system
cannot be used for navigation on procedures that are
identified as not authorized ("NA") without exception by

a NOTAM. For example, an operator may not use a RNAV

system to navigate on a procedure affected by an expired or
unsatisfactory flight inspection, or a procedure that is
based upon a recently decommissioned NAVAID.

4. Pilots may not substitute for the NAVAID (for example,
a VOR or NDB) providing lateral guidance for the final
approach segment. This restriction does not refer to
instrument approach procedures with "or GPS" in the title
when using GPS or WAAS. These allowances do not apply
to procedures that are identified as not authorized (NA)
without exception by a NOTAM, as other conditions may
e _ o r g / still exist and result in a procedure not being available. For
example, these allowances do not apply to a procedure

associated with an expired or unsatisfactory flight

inspection, or is based upon a recently decommissioned
NAVAID.
5. Use of a suitable RNAV system as a means to navigate

on the final approach segment of an instrument approach

procedure based on a VOR, TACAN or NDB signal, is

allowable. The underlying NAVAID must be operational

and the NAVAID monitored for final segment course

alignment.
6. For the purpose of paragraph c, "VOR" includes VOR,
VOR/DME, and VORTAC facilities and "compass

locator" includes locator outer marker and locator middle
marker.

d. Alternate Airport Considerations. For the
purposes of flight planning, any required alternate
airport must have an available instrument approach
procedure that does not require the use of GPS. This
restriction includes conducting a conventional
approach at the alternate airport using a substitute
means of navigation that is based upon the use of
GPS. For example, these restrictions would apply

when planning to use GPS equipment as a substitute

means of navigation for an out-of-service VOR that
supports an ILS missed approach procedure at an
alternate airport. In this case, some other approach
not reliant upon the use of GPS must be available.
This restriction does not apply to RNAV systems