MIL-STD-411F
condition no longer exists or the operator takes an action to store the message in overflow memory (see 5.2.5.3) for later recall.
5.2.5 Message format.
5.2.5.1 Syntax. Warning, caution, and advisory messages shall concisely convey the nature of the problem and the specific subsystem or location. A standard syntax is desirable for all messages, but shall be subordinate to a clear statement of the problem if not appropriate.
5.2.5.2 Prioritization. Messages should be grouped by urgency level. Warnings shall be presented at the top of the annunciator area of the display (which may be at the top or bottom of the display), with cautions and advisories following in that order. The acquiring activity shall approve a scheme for ordering alert messages, such as in order of occurrence, in order of priority, within urgency levels (see 6.3.1).
5.2.5.3 Overflow memory. A system to display messages stored in overflow memory shall be used when the number of active messages exceeds the capacity of the display. If there are more messages than there is space to display them all, an indication shall be provided to the operator that additional alerts exist. Any overflow messages shall be stored and a capability shall be provided to recall/scroll through alerts so stored. If a new alert condition arises:
a. The new message shall be placed with messages of equal criticality.
b. If room does not exist on the display, a message of lower criticality shall be replaced. The replaced message shall be moved into overflow. If no lower criticality message exists, a message of equal criticality shall be moved into overflow.
c. Messages placed in overflow shall be grouped with messages of equal criticality.
5.2.5.4 Color coding. When color is used to provide a unique and easily distinguishable coding method for all three alerting categories, red shall be reserved for warning messages, yellow shall be reserved for caution messages and a third color (green preferred with blue and white as non-flight deck options) shall be used to represent advisory level messages. The chromaticity of the third color shall be significantly different from the chromaticities of the red and yellow signals. All three selected colors must be different enough from the background color so that symbols and words are easily readable.
5.2.5.5 Minimum message duration. It is possible for a warning or caution condition to exist for such a short period of time that a crew member may not have a chance to identify the condition, even though the condition has been cured or otherwise ended. Therefore, a minimum message display time of three seconds is required for all warning and caution messages.
5.2.6 Options and control.
5.2.6.1 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.
5.2.6.2 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
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