MIL-STD-411F
5.1.4.4 Presentation. The master caution signal shall have a steady "ON" light presentation unless a flashing presentation is approved by the acquiring activity (see 6.3.1). All other caution signals shall have a steady "ON" light presentation.
5.1.4.5 Master caution signal reset. The master caution signal shall have a push-to-reset or voice reset capability which deenergizes the master caution signal while the applicable caution signal remains "ON".
5.1.5 Advisory signals. The use of advisory signals in the cockpit area shall be minimized to avoid unnecessary distraction of the aircrew and to minimize those factors which deteriorate night vision capability of the crew. They shall not be used where other methods, such as, switch labeling and mechanical visual signals may be employed. Advisory signals may be either of the legend or nonlegend type. If a nonlegend signal is employed, a readily identifiable legend shall be provided adjacent to, and preferably above, the signal.
5.1.5.1 Color. Except where NVIS compatibility is required, the color of advisory signals in the cockpit shall be aviation green. In other crew stations, advisory signals may be aviation green, aviation blue, or aviation white. The use of blue or white advisory lights should be avoided wherever dark adaptation must be maintained. For NVIS compatibility, the color of advisory lights in all compartments shall be NVIS green A or NVIS green B, as specified in MIL-L-85762.
5.1.5.2 Legend. Legend type advisory signals installed in the crew station shall employ translucent legends on an opaque background as shown on figure 1. The character height of the legend shall subtend a viewing angle of no less than 20 minutes of arc when measured from the aft most point of the design eye line (see 3.7). Character proportions shall be in accordance with
MIL-M-18012. The minimum horizontal separation between two legends shall be two times the width of the widest character. The minimum vertical separation between two legends shall be two character heights. The minimum vertical separation between two lines in the same legend shall be one-half the height of a character.
5.1.5.3 Luminance. The luminance of the signals shall not be less than 150 fL when the signals are operated at rated voltage at the point of entry of the light source. In the crew station, advisory signals shall be dimmed to 1.0 0.50 fL when the pilot's primary interior light control is "ON". Advisory signals shall be capable of being dimmed to a luminance of 0.1 fL when NVIS compatibility is required. The design shall preclude inadvertent dimming during daylight conditions. In other crew stations, advisory signal luminance may be greater than 1.0 0.50 fL when ambient conditions so dictate. Except when NVIS are being used within a crew station, the signals shall be automatically reset to full bright when any of the following conditions exist:
a. Main aircraft power control is turned off. b. Primary interior light control is off.
c. High intensity lights are energized.
When an NVIS-compatible lighting mode is being used within a crew station, the lighting circuit logic shall preclude the system from obtaining a luminance level which will degrade external vision or NVIS performance.
5.1.5.4 Presentation. Advisory signal presentation shall be steady "ON", unless otherwise specified by the acquiring activity (see 6.3.1).
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