VOR/VORTAC/TACAN NAVAID's
Normal Usable Altitudes and Radius Distances Class
Altitude
Distance
(miles)

T
12,000 and below
25

L
Below 18,000
40

H
Below 14,500
40

H
14,500 - 17,999
100

H
18,000 - FL 450
130

H
Above FL 450
100


Altitude and distance limitations need not be applied when any of the
following conditions are met:

a. Routing is initiated by ATC or requested by the pilot and the following
is provided:

1. Radar monitoring.

2. As necessary, course guidance unless the aircraft is /E, /F, /G, or
/R equipped.

NOTE-
1. Para 4-4-1, Route Use, requires radar monitoring be provided at FL
450 and below to aircraft on random (impromptu) RNAV routes.
Para 5-5-1, Application, requires radar separation be provided for these
routes at FL 450 and below.

2. When a clearance is issued beyond the altitude and/or distance
limitations of a NAVAID, in addition to being responsible for maintaining
separation from other aircraft and airspace, the controller is responsible
for providing aircraft with information and advice related to significant
deviations from the expected flight path.