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3.1.4.1Most 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random/unpublished route navigation.
3.1.4.2A 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; even though these altitudes may lie within
the designated SSV.
AIP
United States of America
GEN 3.4−2
15 MAR 07
Nineteenth Edition Federal Aviation Administration
NOTE−
Refer to Federal Aviation Regulations (14 CFR
Section91.177) for minimum altitudes for IFR operations.
Service volume restrictions are first published in the
Notices to Airman (NOTAMs) and then with the
alphabetical listing of the NAVAIDs in the Airport/Facility
Directory.
3.1.4.3Standard service volume limitations do not
apply to published IFR routes or procedures.
3.1.4.4VOR/DME/TACAN Standard Service
Volumes (SSV):
a)SSVs are graphically shown in
FIG GEN 3.4−1, FIG GEN 3.4−2, FIG GEN 3.4−3,
FIG GEN 3.4−4, and FIG GEN 3.4−5. 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.
b)Within 25 NM, the bottom of the T service
volume is defined by the curve in FIG GEN 3.4−4.
Within 40 NM, the bottoms of the L and H service
volumes are defined by the curve in FIG GEN 3.4−5.
FIG GEN 3.4−1
Standard High Altitude Service Volume
(See FIG GEN 3.4−5 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 GEN 3.4−2
Standard Low Altitude Service Volume
(See FIG GEN 3.4−5 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 GEN 3.4−3
Standard Terminal Service Volume
(See FIG GEN 3.4−4 for altitudes below 1,000 feet)
25 NM
12,000 ft.
1,000 ft.
AIP
United States of America
GEN 3.4−3
15 MAR 07
Federal Aviation Administration Nineteenth Edition
3.1.4.5Nondirectional Radio Beacon (NDB)
a)NDBs are classified according to their intended
use.
b)The ranges of NDB service volumes are shown
in TBL GEN 3.4−2. The distances (radius) are the
same at all altitudes.
TBL GEN 3.4−1
VOR/DME/TACAN Standard Service Volumes
SSV Class Designator Altitude and Range Boundaries
T (Terminal) . . . . . . . . . . . .
From 1,000 feet above ground level (AGL) up to and including 12,000 feet AGL at radial
distances out to 25 NM.
L (Low Altitude) . . . . . . . .
From 1,000 feet AGL up to and including 18,000 feet AGL at radial distances out to 40
NM.
H (High Altitude)
From 1,000 feet AGL up to and including 14,500 feet AGL at radial distances out to 40
NM. From 14,500 AGL up to and including 60,000 feet at radial distances out to 100 NM.
From 18,000 feet AGL up to and including 45,000 feet AGL at radial distances out to 130
NM.
TBL GEN 3.4−2
NDB Service Volumes
Class Distance (Radius)
Compass Locator 15 NM
MH 25 NM
H 50 NM*
HH 75 NM
* Service ranges of individual facilities may be less than 50 nautical
miles (NM). Restrictions to service volumes are first published as a
Notice to Airmen and then with the alphabetical listing of the NAVAID
in the A/FD.
FIG GEN 3.4−4
Service Volume Lower Edge Terminal
1000
500
0
0 5 10 15 20 25
DISTANCE TO THE STATION IN NM
ALTITUDE IN FEET
AIP
United States of America
GEN 3.4−4
15 MAR 07
Nineteenth Edition Federal Aviation Administration
FIG GEN 3.4−5
Service Volume Lower Edge
Standard High and Low
1000
500
0
0 10 20 30 40
DISTANCE TO THE STATION IN NM
ALTITUDE IN FEET
5 15 25 35
3.1.5NAVAIDs with Voice
3.1.5.1Voice equipped en route radio navigational
aids are under the operational control of either an
FAA Automated Flight Service Station (AFSS) or an
approach control facility. The voice communication
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