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e. Due to the limited number of available
frequencies, assignment of paired frequencies is
required for certain military noncollocated VOR and
TACAN facilities which serve the same area but
which may be separated by distances up to a few
miles.
f. VOR/DME, VORTAC, ILS/DME, and LOC/
DME facilities are identified by synchronized
identifications which are transmitted on a time share
basis. The VOR or localizer portion of the facility is
identified by a coded tone modulated at 1020 Hz or
a combination of code and voice. The TACAN or
DME is identified by a coded tone modulated at
1350_Hz. The DME or TACAN coded identification
is transmitted one time for each three or four times
that the VOR or localizer coded identification is
transmitted. When either the VOR or the DME is
inoperative, it is important to recognize which
identifier is retained for the operative facility. A
single coded identification with a repetition interval
of approximately 30 seconds indicates that the DME
is operative.
g. Aircraft equipment which provides for
automatic DME selection assures reception of
azimuth and distance information from a common
source when designated VOR/DME, VORTAC and
ILS/DME navigation facilities are selected. Pilots are
cautioned to disregard any distance displays from
automatically selected DME equipment when VOR
or ILS facilities, which do not have the DME feature
installed, are being used for position determination.
1-1-8. Navigational Aid (NAVAID) Service
Volumes
a. Most air navigation radio aids which provide
positive course guidance have a designated standard
service volume (SSV). The SSV defines the reception
limits of unrestricted NAVAIDs which are usable for
random/unpublished route navigation.
b. A NAVAID will be classified as restricted if it
does not conform to flight inspection signal strength
and course quality standards throughout the
published SSV. However, the NAVAID should not be
considered usable at altitudes below that which could
be flown while operating under random route IFR
conditions (14_CFR Section 91.177), even though
these altitudes may lie within the designated SSV.
Service volume restrictions are first published in
Notices to Airmen (NOTAMs) and then with the
alphabetical listing of the NAVAIDs in the A/FD.
c. Standard Service Volume limitations do not
apply to published IFR routes or procedures.
d. VOR/DME/TACAN Standard Service
Volumes (SSV).
1. Standard service volumes (SSVs) are graphi-
cally shown in FIG 1-1-1, FIG 1-1-2, FIG 1-1-3,
FIG 1-1-4, and FIG 1-1-5. The SSV of a station is
indicated by using the class designator as a prefix to
the station type designation.
EXAMPLE-
TVOR, LDME, and HVORTAC.
AIM 2/14/08
1-1-5
Navigation Aids
FIG 1-1-1
Standard High Altitude Service Volume
(See FIG 1-1-5 for altitudes below 1,000 feet).
60,000 ft.
100 NM
130 NM
45,000 ft.
18,000 ft.
14,500 ft.
1,000 ft. 40 NM
FIG 1-1-2
Standard Low Altitude Service Volume
(See FIG 1-1-5 for altitudes below 1,000 feet).
NOTE: All elevations shown are with respect
to the station's site elevation (AGL).
Coverage is not available in a cone of
airspace directly above the facility.
40 NM
18,000 ft.
1,000 ft.
FIG 1-1-3
Standard Terminal Service Volume
(See FIG 1-1-4 for altitudes below 1,000 feet).
25 NM
12,000 ft.
1,000 ft.
AIM 2/14/08
1-1-6 Navigation Aids
2. Within 25 NM, the bottom of the T service
volume is defined by the curve in FIG 1-1-4. Within
40 NM, the bottoms of the L and H service volumes
are defined by the curve in FIG 1-1-5. (See
TBL 1-1-1.) |
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