5.7.1 The operational status of information should
be indicated as follows:
| Status
|
Visual indication
|
Audible signal
|
| Alarm, not acknowledged
|
Red, flashing
|
Accompanied by an audible signal
|
Alarm, acknowledged
Invalid
Information
|
Red
|
Suppression of audible signal
|
Important
Indications
(Warnings)
(e.g. low
integrity)
|
Yellow
|
Silence unless otherwise specified by the
Organization
|
| Normal state
|
None required, optionally green
|
Silence
|
5.7.2 A list of alarms should be provided based
on the sequence of occurrence. Additional indication of priority,
as set by the user, should be provided on displays showing alarms
from multiple sources. Alarms that have been acknowledged and are
no longer relevant should be deleted from the list of alarms, but
may be retained in an alarm history list.
5.7.3 When a single display is used to present
information from multiple navigation systems and equipment, the presentation
of alarms and indications should be consistent for the display of
the time of alarm occurrence, the cause of the alarm, the source of
the alarm and the status of the alarm (e.g. acknowledged, not acknowledged).