MIL-STD-411F
aircrew all information for operation and maintenance functions as required by the acquiring activity (see 6.3.1). Conditions which fall into the warning, caution, or advisory category shall be based on the aircraft's subsystems, its roles and missions, and the aircrew's information requirements.
4.1.2.3 Presentation of signals. Presentation of signals shall be as specified by the acquiring activity (see6.3.1). Signals shall not be actuated by transient, erroneous, or random sensor signals.
4.1.3 Signal displays.
4.1.3.1 Legends. Legends shall be in accordance with MIL-STD-783.
4.1.3.2 Color. Unless otherwise specified in the contract or purchase order, all colors specified herein shall be in accordance with MIL-C-25050, aviation colors. Color coding of electronic displays shall be used as a coding method. For electronic color displays, chromaticity shall be in accordance with the system specification and shall ensure discriminability of the alert message.
4.1.3.3 Luminance and contrast.
4.1.3.3.1 Transilluminated displays. The luminance level of dedicated transilluminated signals and legends shall be compatible with the expected surrounding luminance and operating conditions and shall have a discernible contrast to ensure that alert messages can be perceived by the crewmember under all expected lighting conditions.
4.1.3.3.2 Electronic displays. The luminance and contrast of electronic displays shall have a discernible contrast to ensure that alert messages can be perceived by the crewmember under all expected lighting conditions.
4.1.3.4 Lettering. All characters shall be upper case except on integrated displays, on which lower case characters may be used. All letters and numbers on dedicated signal assemblies shall be in accordance with MIL-M-18012. Letters and numbers on electronic displays should be in conformance with the labeling requirements of MIL-STD-1472. Character dimensions shall be as specified in 5.2.9.
4.1.3.5 Visual signal flash rate. Flashing presentations should be avoided; however, where they are required for their alerting value, they shall have a flash rate between three to five Hz. The "ON" time shall be approximately equal to the "OFF" time. No more than two flash rates shall be used. Where two flash rates are used, the second rate shall be one to two Hz. Flashing presentations which could be simultaneoulsy active should have synchronized flashes.
4.1.3.6 Test systems. A single test switch shall be provided for testing all dedicated displays and, where possible, all subsystem circuitry within a given crew station. A test switch is not necessary if the function is automated within an integrated alert display. Blank signals, provided for a growth capability on the annunciator assembly shall also be included as part of the test circuitry.
4.1.3.7 Alerting signals. The system should be designed to minimize the effects of undetected, false, or nuisance alerts, or any condition which would cause a crewman to perceive an alert signal to be energized when it is not.
5
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business