MIL-STD-411F
4.1.3.8 Cancellation of master warning/caution signal. The master warning signal and master caution signal shall remain "ON" until it is cancelled by the crewman or cancelled automatically when the problem has been corrected. Audio portions of alerting signals shall be automatically cancelled within ten seconds if not previously cancelled by a crewmember. Upon cancellation, the master warning/caution signal shall be reset automatically to be able to annunciate new alerting situations.
4.1.4 NVIS lighting compatibility.
4.1.4.1 Alerting system. When NVIS lighting compatibility is a requirement, the alerting system shall be in accordance with MIL-L-85762. Compensatory means of attention getting, such as auditory or flashing, may be required to augment the visual signal.
5. DETAILED REQUIREMENTS
5.1 Dedicated signal assemblies.
5.1.1 Signal perception. The legend on light signals, when energized, shall be readable in a
10,000 fc environment with the source illumination striking the face of the display at an angle of
incidence of 90 degrees. When not energized, the legend shall not be perceptible in the presence
of high ambient illumination.
5.1.1.1 Light signal luminance. The luminance level of dedicated transilluminated signals and legends shall be measured by averaging the readings within small sub-areas of the signal or legend. Readings on an illuminated letter which is a portion of a word or legend, may be averaged if a minimum of three readings taken on separate locations on each letter make up the average luminance. Warning light signal utilizing opaque letters and a translucent background may be divided into a minimum of five approximately equal subareas for determination of luminance compliance. Each subarea (containing at least three separate readings, which may be averaged) shall individually meet the luminance requirements. All legends shall be capable of being read in bright sunlight. The average contrast ratio of any lighted legend to the background
shall be 2.0 minimum when the display is subjected to ambient illumination of 10,000 fc at 5,000 ±
500 degrees Kelvin color temperature. The contrast ratio of any unlighted legend to the
background shall be less than 0.1 for any legends, which are slightly visible.
5.1.2 Location and arrangement of signals. The location and arrangement of dedicated warning, caution and advisorty signals shall be in accordance with MIL-STD-203 or as specified by the acquiring activity (see 6.3.1). Warning signals shall be installed within the pilot's 30 degree (total included angle) forward cone of vision. When space is limited or the required number of warning signals is excessive, warning signals may be grouped outside of the pilot's 30 degree forward cone of vision, provided a master warning signal is installed within the pilot's 30 degree forward cone of vision. Additionally, the master caution signal shall be located within the pilot's
30 degree forward cone of vision.
5.1.3 Warning signals. When required, legend warning and master warning signals shall be used in all aircrew stations. A master warning signal, when required, shall be energized simultaneously with any individual warning signal.
5.1.3.1 Color. Except where NVIS compatibility is required, the color of the warning signals shall be aviation red. Where NVIS compatibility is required, the color of the warning signals shall be in accordance with MIL-L-85762.
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