Page 148 - Planning and Design of Airports

Air Traf fic Management 117

TVOR
250' Taxiway

500' 500'

Runway

Runway

FIGURE 3-12 TVOR location standards.

portion of its VOR facilities with the distance measuring components
of TACAN. These stations are known as VORTAC stations. If a station
has full TACAN equipment, both azimuth and distance measuring
equipment, and also VOR, it is designated as VORTAC.
NDB and VOR systems are often located on airport airfields. The
location of these systems on airport, known as TVORs, are significant
to airport planners and designers, as the location of other facilities,
such as large buildings, particularly constructed of metal, may
adversely affect the performance of the navaid.
As illustrated in Fig. 3-12, TVORs should be located at least 500 ft
from any runways and 250 ft from any taxiways. Any structures or
trees should be located at least 1000 ft from the TVOR antenna. There
should also be a clearance angle of at least 2.5° for any structures and
2.0° for any trees beyond 1000 ft, as illustrated in Fig. 3-13.

Tree
Clearance
Angle
2° Antenna Shelter

Counterpoise
Antenna
Height
2.5° 16"–17"
(5 M)
1.2°

1,000' Min 200' Min Radius Clearance Angles
(300 M) (80 M) 2.5° for Wooden Structures
1.2° for Metal Structures
Max Allowable Slope 4%
FIGURE 3-13 TVOR clearance requirements.