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EXAMPLE−
1. ALB J37 BUMPY J14 BHM
Spelled out: from Albany, New York, via Jet Route 37
transitioning to Jet Route 14 at BUMPY intersection,
thence via Jet Route 14 to Birmingham, Alabama.
2. ALB J37 ENO J14 BHM
Spelled out: from Albany, New York, via Jet Route 37
transitioning to Jet Route 14 at Smyrna VORTAC (ENO)
thence via Jet Route 14 to Birmingham, Alabama.
3. The route of flight may also be described by
naming the reporting points or NAVAIDs over which
the flight will pass, provided the points named are
established for use at the altitude or flight level
planned.
EXAMPLE−
BWI V44 SWANN V433 DQO
Spelled out: from Baltimore-Washington International, via
Victor 44 to Swann intersection, transitioning to Victor 433
at Swann, thence via Victor 433 to Dupont.
4. When the route of flight is defined by named
reporting points, whether alone or in combination
with airways or jet routes, and the navigational aids
(VOR, VORTAC, TACAN, NDB) to be used for the
flight are a combination of different types of aids,
enough information should be included to clearly
indicate the route requested.
EXAMPLE−
LAX J5 LKV J3 GEG YXC FL 330 J500 VLR J515 YWG
Spelled out: from Los Angeles International via Jet Route 5
Lakeview, Jet Route 3 Spokane, direct Cranbrook, British
Columbia VOR/DME, Flight Level 330 Jet Route 500 to
Langruth, Manitoba VORTAC, Jet Route 515 to Winnepeg,
Manitoba.
5. When filing IFR, it is to the pilot’s advantage
to file a preferred route.
REFERENCE−
Preferred IFR Routes are described and tabulated in the Airport/Facility
Directory.
6. ATC may issue a DP or a STAR, as
appropriate.
REFERENCE−
AIM, Instrument Departures, Paragraph 5−2−6.
AIM, Standard Terminal Arrival (STAR), Area Navigation (RNAV) STAR,
and Flight Management System Procedures (FMSP) for Arrivals,
Paragraph 5−4−1.
NOTE−
Pilots not desiring a DP or STAR should so indicate in the
remarks section of the flight plan as “no DP” or “no
STAR.”
c. Direct Flights
1. All or any portions of the route which will not
be flown on the radials or courses of established
airways or routes, such as direct route flights, must be
defined by indicating the radio fixes over which the
flight will pass. Fixes selected to define the route shall
be those over which the position of the aircraft can be
accurately determined. Such fixes automatically
become compulsory reporting points for the flight,
unless advised otherwise by ATC. Only those
navigational aids established for use in a particular
structure; i.e., in the low or high structures, may be
used to define the en route phase of a direct flight
within that altitude structure.
2. The azimuth feature of VOR aids and that
azimuth and distance (DME) features of VORTAC
and TACAN aids are assigned certain frequency
protected areas of airspace which are intended for
application to established airway and route use, and
to provide guidance for planning flights outside of
established airways or routes. These areas of airspace
are expressed in terms of cylindrical service volumes
of specified dimensions called “class limits” or
“categories.”
REFERENCE−
AIM, Navigational Aid (NAVAID) Service Volumes, Paragraph 1−1−8.
3. An operational service volume has been
established for each class in which adequate signal
2/17/05 AIM
Preflight 5−1−13
coverage and frequency protection can be assured. To
facilitate use of VOR, VORTAC, or TACAN aids,
consistent with their operational service volume
limits, pilot use of such aids for defining a direct route
of flight in controlled airspace should not exceed the
following:
(a) Operations above FL 450 − Use aids not
more than 200 NM apart. These aids are depicted on
enroute high altitude charts.
(b) Operation off established routes from
18,000 feet MSL to FL 450 − Use aids not more than
260 NM apart. These aids are depicted on enroute
high altitude charts.
(c) Operation off established airways below
18,000 feet MSL − Use aids not more than 80 NM
apart. These aids are depicted on enroute low altitude
charts.
(d) Operation off established airways between
14,500 feet MSL and 17,999 feet MSL in the
conterminous U.S. − (H) facilities not more than
200 NM apart may be used.
4. Increasing use of self-contained airborne
navigational systems which do not rely on the
　
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