Commercial in confidence
85-909
PLB service manual
Issue 4
Page 4
1.5. False alarms
Every care must be taken to avoid the generation of false alarms.
For test purposes the PLB may be operated in the following ways
without
generating a false
alarm:
1. Self test mode (but avoid repetitive self tests)
2. Live mode for less than 120 seconds (after 120 s a live transmission is made)
3. Live mode in a screened enclosure
If for any reason the PLB is activated outside a screened enclosure (other than as a self test
and for less than 120 seconds), it must be assumed that a false alarm has been generated. It
is not sufficient to de-activate the PLB immediately – once the transmission has been made
the alert has been generated.
The rescue services must be informed immediately that there has been a false alarm. Use
any means available to contact the nearest Rescue Coordination Centre (RCC); state that
there has probably been a false alarm, identify the location of the PLB and if possible give
the PLB ID.
De-activating a live PLB
Press and hold the OFF/Test button; wait for the red LED to extinguish.
If the LED does not extinguish, remove the battery (refer to section 3.8) and return the PLB to
McMurdo for investigation.
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