UFC 3-535-01
17 November 2005
well as condition of each system or subsystem. The colors selected should correlate
with the lighting system being represented.
13-16.6.2.3 Event Recording Devices
Event recording devices (storage, printer) for time and sequence of alarms and status
information. In the event of failure, the system must ensure that the status of the
subsystem will not change automatically to a dangerous or undesirable condition. For
most airfield lighting systems, the actual intensity level selected at the time of a failure
should be maintained in order to preserve the operational state. Systems which protect
safety related zones on the airfield, such as a runway, should be switched on or off, as
appropriate for the operational requirements.
13-16.6.2.4 Interface
Interface to regulators and other units for control and status indications, and for
monitoring.
13-16.6.2.5 Optional Other Interfaces
E.g., field sensors, meteorological systems, or SMGCS
13-16.6.3
Power Considerations
13-16.6.3.1 If secondary power supply for the airfield systems is provided, the
control/monitoring system should be switched to the secondary supply along with
lighting systems in the event of a failure or initiated transfer. During switch-over, the
control/monitoring system must maintain any relevant information and commands.
13-16.6.3.2 If control/monitoring system, or any subsystems, are not tolerant of power
interruption, all sensitive components should be furnished with their own uninterruptible
power supply (UPS). The capacity of the UPS should ensure operation for a period of at
least 20 times the maximum switch-over time to the secondary power supply.
13-16.6.4
System Response Time
The response time of a computerized control system may vary. It is therefore
recommended that minimum response times be considered when selecting a system.
The response times in Table 13-3 are recommended in specifying a computerized
airfield ground lighting (AGL) control system.
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