18.1 The alert management should provide:
- the means used to draw the attention of the bridge team
to the existence of abnormal situations,
- the means to enable the bridge team to identify and address that
condition,
- the means for the bridge team and pilot to assess the urgency
of different abnormal situations in cases where more than one abnormal
situation has to be handled,
- the means to enable the bridge team to handle alert announcements,
and
- the means to manage all alert related states in a distributed
system structure in consistent manner.
18.2 If practicable, there should be not more
than one alert for one situation that requires attention.
18.3 The alert management should as a minimum
be able to handle all alerts required by performance standards
adopted by the Organization for navigational equipment comprised by
the INS or connected to the INS. The alert management should have
the capability to handle all other alerts of navigational equipment
comprised by the INS or connected to the INS in identical
manner and should incorporate all alerts that are critical to the
safety of navigation.
18.4 The logical architecture of the alert
management and the handling concept for alerts should provide the
capability to minimize the number of alerts especially those on a
high priority level (e.g. using system knowledge from redundancy
concepts inside INS and evaluating inherent necessities for alerts
against navigational situations, operational modes or activated navigational
functions).
18.5 It should be possible to provide the
central alert management HMI at least on the navigating and
manoeuvring workstation and allowing the handling by the bridge team.
18.6 The audible announcement of alerts should
enhance the guidance of the bridge team to the task stations or
displays which are directly assigned to the function generating the
alert and presenting the cause of the announcement and related
information for decision support, e.g., dangerous target alarms
should appear and have to be acknowledged at the workstation where
the collision avoidance function is provided.
18.7 As alerts can be displayed at several locations,
the system should be consistent as far as practicable with respect
to how alerts are displayed, silenced and acknowledged at any one
task station of the INS.