Alarm Requirements. As a minimum, alarms shall be provided to
indicate loss of power, loss of air conditioning, and fire.
a) Cable vault. Cables shall enter the control tower through a
cable vault. This area shall be devoted to organizing and routing cables
prior to their entry into the cable shaft.
b) Cable shaft. Power and communication cables from the adjacent
building shall pass through a utility duct and enter the cable vault below
grade. From the cable vault, the cables shall pass through a vertical tunnel
called a cable shaft. Shaft access off a tower stair landing shall be
provided at least every 15 feet (4.6 m).
c) Junction room. The junction room is the primary access area to
the control cab floor. The control consoles shall open into this space.
Power and control cables pertinent to the control cab's function shall
converge here and be terminated or rerouted, and the communication, control,
and power feeder ducts shall branch here.
d) Interior wiring. Cable shall be run in the spaces provided by
standard cellular floor construction.
Communications. The quantity and type of communication equipment
will be set forth in the BESEP. As a minimum, a normal system and an
emergency system will be required.
Normal Communication System. This system consists of HF and
VHF/UHF radio equipment as required by the operational mission of the air
station. This includes any communication control console equipment, ancillary
equipment, and any standby or backup equipment.
a) Standby equipment. Standby radio equipment is tuned to the
frequency of the primary equipment, and any filaments are kept hot, so it can
be put into operation with no warm-up period. Upon failure of the primary
equipment, transfer to the standby equipment is effected instantly by pressing
a button on a console.
(b) Backup equipment. Backup equipment may be of the same type as
the primary and standby equipment, but it is not necessarily tuned to the same
frequency, and it is not kept hot.
Emergency Communication System. A minimum capability system, used
only when the normal system is inoperative, keeps the station in limited
operation by diverting air traffic, landing only aircraft that cannot be
diverted to another airfield. This system shall be completely independent of
the normal system. Control of the emergency communication system shall be
completely independent of normal console control facilities.
Grounding. Criteria for transmitter and receiver facilities shall