MIL-STD-411F
5.2 Integrated alert displays.
5.2.1 Benefit. The benefit of an integrated display for the presentation of warning, caution and advisory messages is that it allows a single location for message presentation. It can present a concise alphanumeric message for each alerting situation, information about the alert urgency level, recommended corrective actions, and feedback to the crew when faults are corrected.
5.2.2 Display type. Display types may include cathode ray tube, plasma, thin film electroluminescent, liquid crystal, or a medium approved by the acquiring activity (see 6.3.1). The requirements herein apply to any type display. The presentation medium used for the
information display is left to the discretion of the airframe manufacturer and the acquiring activity
(see 6.3.1).
5.2.3 Number and location of displays. The number of displays shall be based upon the informational requirements of the aircrew and the reliability of the displays. Unless otherwise specified, all warning, caution and advisory messages shall be presented within the operator's
30 degree (total included angle) forward cone of vision, on a single display surface. If more than one display is present at a crew station, the display farthest to the left should display all warning, caution and advisory messages. Warning, caution and advisory messages may be presented on a head-up display only with acquiring activity approval (see 6.3.1). The location of the display(s) and the viewing angle(s) should be such that the readability is not degraded, even in illumination up to 10,000 fc through the aircraft windows. If interactive control functions are included with the display, they shall be within the anthropometric reach of the operator using them, as constrained by the crew station installation for the particular air vehicle involved. The requirements for control and display integration and for the specific display under consideration shall be as specified in MIL-STD-1472.
5.2.4 Message presentation. The presentation of warning, caution, and advisory messages shall be as specified herein. Alternate means of communicating warning, caution, or advisory messages that take advantage of integrated interactive technologies may be used when approved by the acquiring activity (see 6.3.1).
5.2.4.1 Warning messages. The presentation of warning messages shall have precedence over caution and advisory messages and routine display information. What constitutes routine display information will be dependent on the aircraft's role, mission and flight phase and shall be approved by the acquiring activity (see 6.3.1). Whenever one or more warning conditions are present, the message(s) shall appear in a location dedicated for the presentation of warning messages. The dedicated location may be at the top or bottom of the display. The warning message location may blank out any display symbology or video, except that which has been determined to be flight critical, when presenting a message. Only the appropriate active warning message(s) shall appear; however, the location for presenting the warning messages shall be large enough to present as many messages as there are warnings within the system. Warning messages shall remain presented until the causative condition has been corrected.
5.2.4.2 Caution messages. The presentation of caution messages shall have precedence over advisory messages and routine display information. Caution messages shall remain presented until either the causative condition has been corrected or the operator takes an action to store the message in overflow memory (see 5.2.5.3) for later recall.
5.2.4.3 Advisory messages. The presentation of advisory messages shall have precedence over routine display information. Advisory messages shall be presented until either the causative
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