220.127.116.11 Message prioritization. As a minimum, messages
shall be prioritized by urgency level. A prioritization scheme that is
flight phase adaptive should be incorporated in the alerting system.
Aircraft configuration variations and exceptions shall be considered in
tailoring a scheme to specific aircraft.
18.104.22.168 Inhibit logic. An inhibit logic may be
incorporated in the alerting system. Depending on system specifics, "on
ground" conditions may inhibit certain caution messages as well as
inhibiting caution messages during an "ENGINE OUT" warning condition. The
inhibit scheme should be flight phase related, that is, non-critical
messages should be inhibited during critical phases of flight, during high
workload periods, and during multiple failure situations. Any specific
methodology for applying an inhibit logic shall be evaluated and approved by
the acquiring activity prior to implementation (see 6.3.1).
22.214.171.124 Storage and recall. If specified by the
acquiring activity, a capability shall be provided to enable the crew to
store and recall caution and advisory level messages. The display shall
provide an indication of the quantity and type of messages that are in
memory. Both selective and total storage and recall capabilities should be