MIL-STD-411F
3.13.3 Caution signal. A visual signal which indicates the existence of a condition requiring immediate attention but not immediate action.
3.13.4 Legend signal. A visual signal containing alphanumeric characters or symbols.
3.13.5 Master caution signal. A visual signal which indicates that one or more caution signals have been energized.
3.13.6 Master warning signal. A visual signal which indicates that one or more warning signals have been energized.
3.13.7 Nonlegend signal. A visual signal which has no alphanumeric characters or signals arranged categorically or functionally.
3.13.8 Warning signal. A visual signal which indicates the existence of a hazardous condition requiring immediate action to prevent loss of life, equipment damage, or abortion of the mission.
4. GENERAL REQUIREMENTS
4.1 Aircrew station alerting system.
4.1.1 Functional requirements. The following requirements are considered requisites in the design of an effective alerting system:
a. Should not give audible and visible caution and warning alerts when all systems are operating normally.
b. Should reduce aircrew information assimilation and memory demands.
c. Should minimize the time required for the aircrew to detect and to assess failure conditions and to initiate corrective actions.
d. Should provide visual alerts which can be detected and understood easily under high altitude, high ambient light and critical conditions; such as, high-G, high workload, high stress, low light level.
e. Should be standardized to maximize recognizability.
f. Should provide for alerting system growth capability in a form that does not necessitate additional system components.
4.1.2 Selection and presentation of signals.
4.1.2.1 Luminance contrast and levels. Visual signals shall be presented and located to provide a perceptible luminance contrast to minimize the effects of excessive ambient light. At any location, the signals shall have a luminance and contrast that is fully readable and easily recognizable in a 10,000 fc lighting environment.
4.1.2.2 Selection of signals. The selection of signals, visual versus audio, shall be in accordance with MIL-STD-1472. Specific signals shall be provided to furnish the
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