Page 17 - Jan25

Radio Class Designations
VOR/DME/TACAN Standard Service Volume (SSV) Classifications
Radio Class Designations
VOR/DME/TACAN Standard Service Volume (SSV) Classifications
SSV Class
(T) Terminal
(L) Low Altitude (H) High Altitude
Altitudes
1,000’ to 12,000’ 1,000’ to 18,000’ 1,000’ to 14,500’
14,500’ to 18,000’
18,000’ to 45,000’
45,000’ to 60,000’
Distance (NM)
25 40 40
100
130
100
SSV Class
(T) Terminal
(L) Low Altitude (H) High Altitude
(VL) VOR Low
(VH) VOR High
Altitudes
1,000’ to 12,000’ 1,000’ to 18,000’ 1,000’ to 14,500’
14,500’ to 18,000’
18,000’ to 45,000’
45,000’ to 60,000’ 1,000’ to 5,000’
5,000’ to 18,000’ 1,000’ to 5,000’
5,000’ to 14,500’
14,500’ to 18,000’
18,000’ to 45,000’
45,000’ to 60,000’
12,900’ to 18,000’ 12,900’ to 45,000’
45,000’ to 60,000’
Distance (NM)
25 40 40
100
130
100 40
70 40
70
100
130
100
130 130
100
Figure 1: previous standard service volumes
See Figure 1 for the previous standard service volumes and Figure 2 for the current list of SSV classifications. NAVAIDs with a single component SSV (VOR, DME, TACAN, NDB, NDB/DME) classification depict the name of the NAVAID first then the classification of the SSV in parentheses next on the IFR low-altitude en route charts, as shown in Figure 3. NAVAIDs with two component SSV (VOR/DME, VORTAC) classifications depict the name of the NAVAID first then the classification of the two SSVs in parentheses for each component on the IFR low chart. Figure 4 shows the VOR SSV in the first set of parentheses followed by the DME or TACAN SSV in the second set of parentheses.
(DL) DME Low (DH) DME High
(DL) DME Low & (DH) DME High*
1,000’ to 12,900’
40 increasing to 130
*Between 1,000’ to 12,900’, DME service volume follows a parabolic curve used by flight management computers.
Figure 3: NAVAIDs with a single component SSV
Figure 2: current SSV classifications
Figure 4: NAVAIDs with a two component SSV
JANUARY 2025
KING AIR MAGAZINE • 15