Attachment 14
the aircraft, it shall not significantly alter the path or flight trajectory, nor prevent the aircraft
from completing a successful takeoff or landing. The group of elements may incorporate climb
to service devices such as ladders provided they comply with applicable safety criteria.
A14.2.3. Visual Air Navigational Facilities. This term identifies, as a type of facility, all lights, signs
and other devices located on, and in the vicinity of, an airfield that provide a visual reference to pilots
for guidance when operating aircraft in the air and on the ground. These facilities supplement guidance
provided by electronic aids, such as tactical air navigation (TACAN), and precision approach radar
(PAR). When constructed and sited in accordance with USAF standards promulgated after 17 Sep 79,
these components and systems are frangible. Systems and components not designed and constructed in
accordance with USAF standards must be programmed for replacement. For detailed construction and
siting criteria, see AFI 32-1044 and AFMAN 32-1076.
A14.2.4. Radar Facilities. These facilities provide air traffic controllers information on aircraft
alignment, rate of descent, and relative position in the approach. These facilities include:
A14.2.4.1. Precision Approach Radar (PAR) (Non Frangible).
A14.2.4.2. Mobile Ground Control Approach (GCA) Facility (Non Frangible).
A14.2.4.3. Mobile Radar Approach Control (RAPCON) Facility (Non Frangible). See A14.1.3 for
fixed airport surveillance radar (ASR) siting guidance.
A14.2.4.3.1. These units may be sited not less than 152.4 meters [500 feet] from the centerline of a
runway to the near edge of the equipment. When it becomes necessary, place units between
parallel runways that have insufficient distance to allow a 152.4 meters [500 feet] clearance to the
centerline of the primary instrument runway and the lesser clearance to the centerline of the other
runway. As a rule, these units are not sited between runways that have a separation of less than
304.8 meters [1,000 feet] between centerlines.
A14.2.4.3.2. While it is desirable, from a safety standpoint, to keep these units as low as possible,
the final elevation will be determined by the appropriate support agency. The elevation is
dependent on the necessary lines of site between the unit and calibration reflectors and the
touchdown areas of the runways. If it is necessary to change the existing ground elevation to
provide a proper height for these units, follow grading requirements discussed in Chapter 3.
A14.2.5. Emergency Generators, Maintenance and Personnel Facilities (Non Frangible). These
facilities may be collocated with GCA facilities and mobile RAPCON vans as follows:
A14.2.5.1. Trailers of standard mobile home construction or pre-engineered construction may be
used for maintenance and personnel facilities. (Non Frangible.)
A14.2.5.2. The entire GCA or RAPCON complex consisting of radar vans, emergency generators,
maintenance and personnel trailers must be confined to a site not to exceed 45.7 meters long by
30.5 meters wide [150 feet by 100 feet], with the long side perpendicular to the main runway. The
elevation of antennas and other projections will be held to the minimum essential for proper
operation. Make every effort to keep the site as small as possible and to maintain the greatest
possible distance from the runway. The perimeter of the site must be clearly marked and all future
requirements contained within the area. Integral fuel tanks should be used for necessary mobile
emergency power generator sets. If additional fuel storage tanks are required, they should be
placed below grade.
A14.2.6. Remote Microwave Link (Non Frangible). This equipment provides remote operation and
control of PAR and GCA facilities and must be sited adjacent to them. In siting the antenna, make sure
A14-4
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