4.2.6.3-5 Reminder Audible Signals

If the tone associated with an unacknowledged alarm automatically turns off after an interval of time, a reminder tone should be presented to alert the user to the continued presence of an unacknowledged alarm.

Additional Information:
The same principle holds for alarms that may have had the auditory code suppressed because of high alarm conditions or the presence of more important alarms. When the more important alarms have been addressed, the alarm system should remind the operator, via visual or auditory signals, of the presence of the unacknowledged alarms.