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VOR/VORTAC/TACAN system has resulted in pilot
requests for direct routes which exceed NAVAID
service volume limits. These direct route requests
will be approved only in a radar environment, with
approval based on pilot responsibility for navigation
on the authorized direct route. Radar flight following
will be provided by ATC for ATC purposes.
5. At times, ATC will initiate a direct route in a
radar environment which exceeds NAVAID service
volume limits. In such cases ATC will provide radar
monitoring and navigational assistance as necessary.
6. Airway or jet route numbers, appropriate to
the stratum in which operation will be conducted,
may also be included to describe portions of the route
to be flown.
EXAMPLE−
MDW V262 BDF V10 BRL STJ SLN GCK
Spelled out: from Chicago Midway Airport via Victor 262
to Bradford, Victor 10 to Burlington, Iowa, direct
St. Joseph, Missouri, direct Salina, Kansas, direct
Garden City, Kansas.
NOTE−
When route of flight is described by radio fixes, the pilot
will be expected to fly a direct course between the points
named.
7. Pilots are reminded that they are responsible
for adhering to obstruction clearance requirements on
those segments of direct routes that are outside of
controlled airspace. The MEAs and other altitudes
shown on low altitude IFR enroute charts pertain to
those route segments within controlled airspace, and
those altitudes may not meet obstruction clearance
criteria when operating off those routes.
d. Area Navigation (RNAV)
1. Random RNAV routes can only be approved
in a radar environment. Factors that will be
considered by ATC in approving random RNAV
routes include the capability to provide radar
monitoring and compatibility with traffic volume and
flow. ATC will radar monitor each flight, however,
navigation on the random RNAV route is the
responsibility of the pilot.
2. Pilots of aircraft equipped with approved area
navigation equipment may file for RNAV routes
throughout the National Airspace System and may be
filed for in accordance with the following procedures.
(a) File airport-to-airport flight plans.
(b) File the appropriate RNAV capability
certification suffix in the flight plan.
(c) Plan the random route portion of the flight
plan to begin and end over appropriate arrival and
departure transition fixes or appropriate navigation
aids for the altitude stratum within which the flight
will be conducted. The use of normal preferred
departure and arrival routes (DP/STAR), where
established, is recommended.
(d) File route structure transitions to and from
the random route portion of the flight.
(e) Define the random route by waypoints.
File route description waypoints by using degree-distance
fixes based on navigational aids which are
appropriate for the altitude stratum.
(f) File a minimum of one route description
waypoint for each ARTCC through whose area the
random route will be flown. These waypoints must be
located within 200 NM of the preceding center’s
boundary.
(g) File an additional route description
waypoint for each turnpoint in the route.
AIM 2/17/05
5−1−14 Preflight
(h) Plan additional route description waypoints
as required to ensure accurate navigation via
the filed route of flight. Navigation is the pilot’s
responsibility unless ATC assistance is requested.
(i) Plan the route of flight so as to avoid
prohibited and restricted airspace by 3 NM unless
permission has been obtained to operate in that
airspace and the appropriate ATC facilities are
advised.
NOTE−
To be approved for use in the National Airspace System,
RNAV equipment must meet the appropriate system
availability, accuracy, and airworthiness standards. For
additional guidance on equipment requirements see
AC 20−130, Airworthiness Approval of Vertical
Navigation (VNAV) Systems for use in the U.S. NAS and
Alaska, or AC 20−138, Airworthiness Approval of Global
Positioning System (GPS) Navigation Equipment for Use
as a VFR and IFR Supplemental Navigation System. For
airborne navigation database, see AC 90−94, Guidelines
for Using GPS Equipment for IFR En Route and Terminal
Operations and for Nonprecision Instrument Approaches
in the U.S. National Airspace System, Section 2.
3. Pilots of aircraft equipped with latitude/longitude
coordinate navigation capability, independent
of VOR/TACAN references, may file for random
RNAV routes at and above FL 390 within the
conterminous U.S. using the following procedures.
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