21.1 To ensure a consistent presentation
of alerts and the presentation of a reduced number of high priority
alerts within the INS:
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.1 the alerts released by navigational functions,
sensors, sources should be presented as far as practicable, after
evaluation with the system knowledge of the INS, to reduce
the number of high priority alerts;
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.2 the priority of the alert is to be defined
in compliance with the relevant paragraphs of this performance standards;
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.3 the priority of any alert should be assigned
and presented consistently for all parts of the INS;
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.4 the alert releasing sensor/source or function
(system) should provide the alert related information of
the alert message for explanation and decision support, including
information for user support in respect to the alert messages, as
far as possible;
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.5 if additional information regarding decision
support and user guidance is available with the system knowledge
of the INS, this information should be made available for the user;
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.6 HMI's presenting alert information should have
the capability to present the alert information, provided by the
alert releasing sensor/source or function (system) and the
information added with system knowledge of the INS.
21.2 The audible announcement of category A alerts
should occur at the task stations or displays which are directly
assigned to the function generating the alert.