25 May 2005
Controls. Airfield operational safety requires that air traffic controllers be
able to energize, de-energize, change brightness, and switch the various aviation
lighting circuits quickly as required by the operational conditions. Older lighting control
systems included a primary control panel consisting of switches and relays located in
the air traffic control tower (ATCT). A secondary control panel is located in the airfield
lighting vault (ALV).
More recent airfield lighting control systems have used programmable logic controllers
(PLC) or personal computers (PC) instead of the traditional switch/relay control panel.
These systems may also use coaxial cable, fiber optic cable, or radio telemetry for
communicating control signals from the ATCT to the ALV, and status or alarm signals
from the vault back to the ATCT.
Status Monitoring. Most NAVAIDS require remote status monitoring of
NAVAID electrical circuits at the ATCT. The status monitoring system should show
on/off status as well as brightness control when applicable. Some NAVAID systems
require alarm signals at the ATCT in the event of power failure.
Summary. Table 3-6 summarizes the power and control requirements for