©1999 Navia Aviation AS 21833-3.4 Tower Equipment
OPERATING MANUALNORMARC 7013
INSTRUMENT LANDING SYSTEM
4-5
4.2.2 Pushbuttons
ON/OFF
Used to:
• Toggle the ILS on/off.
Valid when:
• The LOCAL/REMOTE switch must be in REMOTE position, and
• The interlock signal is not active if the ILS is configured for interlock.
SILENCE
Used to:
• Turn off the audio alarm on the slave panel (generated by remote control). Also used for
lamp test (all lamps are illuminated when this push-button is held down).
Valid when:
•Always.
4.2.3 System Status Indications
ALARM
Used to:
• Indicate that the ILS has detected an alarm condition.
Activated by:
• One or more alarms present on the ILS, or
• Communication failure with ILS.
WARNING
Used to:
• Indicate that the ILS has detected one or more warning conditions.
Activated by:
• Warning condition(s) detected by RMS.
NORMAL
Used to:
• Indicate that no alarm conditions are detected by the ILS.
Activated by:
• No alarms present, and
• Communication with ILS is OK.
4.3 Interlock Switch Operation
The interlock function is used when mutual exclusive operation on different ILS systems is
required. An active interlock for a station shall prevent transmission of ILS signals. The inter-
lock signal is connected to the remote control RC1241 and transmitted to the ILS through the
remote control connection.
The interlock function on the ILS is enabled/disabled from configuration settings on the
TC1216A. The rest of this chapter describes an ILS configured for interlock.
When an active ILS receives an active interlock signal, the ILS performs a shutdown. If the
interlock signal is deactivated, the ILS will automatically be turned on after a 20 second delay
period.
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