Section 5. Area Navigation Routes
a. RNAV systems permit navigation via a selected course
to a predefined point without having to fly directly toward
or away from a navigational aid. Several different types of
airborne systems are capable of accurate navigation on an
b. RNAV aircraft are required to have the capability of
operating along and within the lateral confines of VOR
routes and airways. Therefore, current procedures and
separation criteria remain the same for all RNAV aircraft
cleared to operate along the conventional VOR route
c. One item to be considered between area navigation and
the present VOR/DME system is the effect of slant range
error on aircraft position. Aircraft operating along the
conventional VOR route structure are affected by DME slant
range error in a relative manner and are primarily affected
longitudinally since flightpaths are normally directly to or
from ground stations. RNAV aircraft may be affected
laterally as well as longitudinally since they do not have
the disadvantage of having to operate directly to or from
d. RNAV operations will use established and designated
routes, up to and including FL 450, unless air traffic
control radar is used to monitor navigation accuracy and
e. A user must demonstrate that the equipment complies
with accuracy criteria and must receive approval before the
equipment can be used in the ATC system.
20-5-2. WAYPOINT CRITERIA
a. In accordance with paragraph
3-3-4, of this
order, obtain five-letter pronounceable waypoint name/codes
approval from AIM.
b. All magnetic bearings, distances between waypoints,
and geographical coordinates of waypoints must be validated
c. Each waypoint must be defined by geographical
coordinates (e.g., degrees, minutes, seconds, hundredths of
d. RNAV waypoints are used not only for navigation
reference, but also for ATC operational fixes in much the
same manner as VOR/DME ground stations and intersections are
used in the conventional VOR structure. Waypoints are to be
established along RNAV routes at:
1. The end points of RNAV routes.
2. Route turn points.
3. All holding fixes.
4. At any other point of operational benefit, such as
route junction points where required for route clarity.
20-5-3. LATERAL PROTECTED AIRSPACE CRITERIA FOR RNAV EN
a. The criteria contained in this section are applicable
to all established or designated RNAV routes except those
portions of instrument departure procedures and Standard
Terminal Arrival Routes (STARs) appropriate to the
instrument departure procedures and STAR criteria. The
lateral extent of RNAV routes designated in part 71 is
coincident with the lateral protected airspace derived from
b. The basic width of an RNAV route is 8 NM (4 NM on
each side of the route centerline).
20-5-4. EN ROUTE TURN PROTECTION CRITERIA
Additional lateral airspace to be protected for course
changes along RNAV routes at and above FL 180 must be in
accordance with FAAO 7130.2, Airspace to Be Protected for
Course Changes at and Above Flight Level 180. The airspace
to be protected on the overflown side of the route
centerline during course changes of more than 15 degrees
along RNAV routes below FL 180 must be the lateral route
width or 4 NM, whichever is greater, applied until the pilot
reports on course. In effect, this means that the lateral
dimensions of reduced route widths do not constitute fully
protected airspace for aircraft during such course changes.