Do not provide windows.
Premanufactured Building. Consider the use of a premanufactured
building as described in par. 2.3.12.
Electrical Requirements. To avoid potential interference with radar
transmissions locate power, communications, and control cables underground
within 1,000 feet from the facility. Ensure electrical systems do not
interfere with radar transmissions.
Emergency Electrical Power. Provide an emergency generator with
automatic starting and switching capability as described in par. 2.5.7.
Provide emergency power to the entire facility.
Security. VOR, TACAN, and VORTAC facilities are normally located
within the airfield restricted area. This siting typically meets the minimum
security measures for external security. When the facility is located within
a restricted area of a lower level of security or is located remote and
outside of an established restricted area, provide additional measures to meet
the minimum security requirements for the level of security assigned to the
facility. The level of security and the designer's responsibility for
particular security elements will be designated in the IDSEP. Refer to par.
Additional Design Criteria.
Refer to Section 2 for facility design
requirements not addressed above.
Aircraft Landing Systems
Microwave Landing System (MLS)/Instrument Landing System (ILS)
Function. The MLS and ILS buildings are facilities that contain
electronic equipment used in precision instrument approaches.
Microwave Landing System (MLS). The MLS provides azimuth, distance,
elevation, and guide path position to aircraft on a precision approach to the
MLS instrumented runway. The MLS operates in a narrow band microwave
frequency. See Facility Plate 134-40 (Sheets 1 through 4 of 4).
Instrument Landing System (ILS). The ILS provides azimuth,
distance, elevation, and glide path position to aircraft on a precision
approach to the ILS instrumented runway. The ILS operates in the VHF and UHF
radio bands. See Facility Plate 134-40 (Sheets 1 through 6 of 6).
Location - MLS Transmitters. Locate azimuth transmitter on the
extended runway centerline, 700 to 1,200 feet from the end of runway. Locate
elevation transmitter 600 to 900 feet set back from runway approach threshold,
offset 250 to 600 feet from runway centerline on the runway side opposite of