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ICAO Medium Intensity Type B or Type C Obstruction Light
Universal AC & Universal DC Models
Lantern Status
The AV-OL-IMB-12/UM lanterns are fitted with two status LEDs and provide the operator with an
indication of the lantern status.
There is one red and one yellow status LED. The red status LED is used to indicate the health of the
Lantern’s power system. The yellow status LED is used to indicate the operational status of the lantern.
These indicator LED’s can be viewed at the base of the lens.
Once the Flat Battery cutoff condition is in effect, the lantern will not turn back on until it sees day light
and the battery voltage is above 12.5V for at least one minute.
If the lantern is not fitted with GPS Synchronisation Option, then the following conditions are not
possible: 1 Quick Flash, and Slow Flashing.
The LEDs are located on the side of the lantern.
Red Status LED Lantern Status
Lantern Condition
Steady
Flat Battery cut off is in effect
OFF
Battery voltage is less than 10.0V
Slow
High Voltage
Battery voltage is above 13.5V
Off
Optimal Voltage
Battery Voltage is between 12.5V – 13.5V
1 Quick
OK Voltage
Battery Voltage is between 12.0V – 12.5V
2 Quick
Low Voltage
Battery Voltage is between 11.5V – 12.0V
3 Quick
Poor Voltage
Battery Voltage is between 10.0V – 11.5V
4 Quick
Flat Voltage
Battery voltage is less than 10.0V
Yellow Status
LED
Lantern Status
Lantern Condition
Off
Daylight, Standby
OFF
Lantern is in Daylight and in Dusk till Dawn
mode or in Standby Mode
Quick Flashing
0.15s on, 0.15s off
Day to night transition
OFF
Light is activating and will turn on after
detecting 30 seconds of continuous
darkness.
2 Quick Flashes
every 2s
Night Operation, Not
Synchronized
ON
Lantern is in Normal operating condition.
It is not connected to any GPS
synchronisation
1 Quick Flashes
every 2s
Night Operation, Sync in
Progress
ON
Lantern is ‘re-syncing’ with GPS.
The lantern re-sync’s with the GPS every
15 minutes.
Slow Flashing
1.5s on, 1.5s off
Night Operation, Synchronized
ON
Normal operating condition. Lantern is
synchronised to GPS-enabled lanterns
2 Quick flashes
every 11s
Night Operation, Synchronized
ON
Lantern is a Hard Wire Synchronisation
Slave.
