MIL-STD-411F
3.5.2 Audio warning/master warning signal. An audible signal which indicates the existence of a particular hazardous condition requiring immediate corrective action.
3.5.3 Tone. A sound with definable regularity of oscillation or no oscillation (steady tone).
3.5.4 Voice message. An audio signal with a verbal communication format.
3.6 Contrast and contrast ratio. For the purposes of this standard, contrast (C) is defined as:
L(T)-L(B) C = L(B)
where L(T) is the total luminance (image plus background) and L(B) is the luminance of the background portion. Contrast ratio defined as L(T)/L(B) and is one more than the contrast.
3.7 Design eye line. The design eye line is a segment of the over the nose vision line connecting two points which represents the predicted eye positions of the extremes of the aircrew population.
3.8 Design eye position. The design eye position is the midpoint of the design eye line from which all crewstation dimensions are related and referenced.
3.9 Display. A device which presents information to one or more aircrew members via one or more of the senses.
3.9.1 Dedicated alert display. A display whose sole purpose is to present alert signals.
3.9.2 Integrated display. A display which can operate in several modes or functions, one of which is the presentation of alert signals.
3.9.3 Transilluminated display. A display in which the light passes from behind the display surface through translucent portions.
3.10 Flag. A visual mechanical or electromechanical device used to show a change in the status of an indicator, instrument, or its associated system.
3.11 Indicator. A display device, usually mechanical or electromechanical, which indicates discrete conditions or status of a system.
3.12 Tactial signal. A signal which is felt rather than seen or heard.
3.13 Visual signal. A signal which is seen rather than heard or felt.
3.13.1 Advisory signal. A visual signal which indicates a safe or normal configuration, condition of performance or operation of essential equipment, or attracts attention and imparts information for routine action purposes.
3.13.2 Annunciator assembly. A grouped assembly of two or more warning, caution, or advisory legend signals arranged categorically or functionally.
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