Federal Aviation Administration Twentieth Edition
operator must not use the database to conduct the operation.
3.2 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 (e.g., aircraft flight manual and Advisory Circular material), the following systems qualify as a suitable RNAV system:
3.2.1 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
3.2.2 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:
http://www.faa.gov/about/office_org/ headquarters_offices/avs/offices/afs/ afs400/afs470/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.
3.3 Uses of Suitable RNAV Systems. Subject to the operating requirements, operators may use a suitable RNAV system in the following ways.
3.3.1 Determine aircraft position relative to, or distance from a VOR (see NOTE 5 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.
3.3.2 Navigate to or from a VOR, TACAN, NDB, or compass locator.
3.3.3 Hold over a VOR, TACAN, NDB, compass locator, or DME fix.
3.3.4 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 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.
For the purpose of paragraph NO TAG, “VOR” includes VOR, VOR/DME, and VORTAC facilities and “compass locator” includes locator outer marker and locator middle marker.

3.4 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 using TSO.C145/.C146 WAAS equipment. For further WAAS guidance see ENR 4.1 paragraph 19.

3.5 General Operational Requirements
3.5.1 Pilots must comply with the guidelines contained in their AFM, AFM supplement, operating manual, or pilot’s guide when operating their aircraft navigation system.
　
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