MIL-HDBK-1024/1
Section 3:
AIR NAVIGATION AIDS/AIRCRAFT LANDING SYSTEMS
3.1
Air Navigation Aids
3.1.1
Function. Air navigation aid facilities are for fixed ground
station electronic equipment which transmits bearing, identification, and
distance information to properly equipped aircraft. Air navigation aid
facilities consist of the following:
3.1.1.1
Very High Frequency (VHF) Omni-Directional Range (VOR). The VOR
facility is a VHF, fixed ground-based station which continuously transmits
bearing, identification, and with proper equipment, distance information to
properly equipped aircraft. See Facility Plate 133-25 (Sheets 1 through 4 of
4).
3.1.1.2
Tactical Air Navigation (TACAN). The TACAN facility is an ultra
high frequency (UHF) ground-based station which continuously transmits
bearing, identification, and distance information to properly equipped
aircraft when interrogated. See Facility Plate 133-25 (Sheets 1 through 4 of
4).
3.1.1.3
Very High Frequency (VHF) Omni-Directional Range/Tactical Air
Navigation (VORTAC). The VORTAC facility is a VHF/UHF fixed ground-based
station which continuously transmits bearing, identification, and distance
information to properly equipped aircraft when distance measuring equipment
(DME) is installed. See Facility Plate 133-25 (Sheets 1 through 4 of 4).
3.1.2
Location. Locate the air navigation aid facility, if possible, in
an area adjacent to the intersection of the primary runways. Locate the
facility a minimum of 750 feet from the centerline of runways, and a minimum
of 250 feet from centerline taxiways. When the facility is located off the
airfield, consider selecting a site with one or more flight path courses
providing an approach to the primary runway. Refer to FAA AC 150/5300-13,
Airport Design, and FAA Order 6820.10, VOR, VOR/DME, and VORTAC Siting
Criteria.
3.1.3
Architectural and Structural Requirements.
Provide the following:
a)
Adequate space for equipment and equipment maintenance.
b)
Clear ceiling height of 10 feet.
c)
Work bench.
d)
Restroom (refer to par. 2.4.8).
3.1.3.1
Structure. Provide sufficient roof area to accommodate VOR and
VORTAC roof mounted antenna counterpoise. Consider an extended roof overhang
or an antenna tower to accommodate a large antenna counterpoise.
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