MIL-STD-411F
immediate action and shall only be used to complement red warning or other critical visual signals. The verbal warning signals shall be presented at levels that will ensure operator reception under noise conditions in the specific aircraft. There shall be provision for overriding and resetting the signals. The signal, when activated, shall always start at the beginning of the message and shall continue to be presented until either:
a. The causative condition is corrected.
b. A warning of higher priority is presented.
c. The signal is silenced by manual actuation of the override switch. The structure for verbal warnings shall be:
a. General heading, such as, the system or service involved. b. Specific subsystem or location.
c. Nature of emergency.
Verbal warning signals shall be as specified in MIL-STD-1472.
5.3.7 Other verbal audio signals. Where applicable, the specific requirements in 5.3.6 shall apply to other verbal audio signal assemblies.
5.4 Mechanical visual signals. The criticality of the mechanical visual signal and the informational requirements of the aircrew shall be used to determine if the onset of the mechanical signal will activate the master warning/master caution signal. When mechanical visual signals are used, the signal shall be in accordance with MIL-STD-1472 for a given type of signal device.
5.4.1 Color. Mechanical visual signals shall have white markings on a black background or as specified by the acquiring activity (see 6.3.1).
5.4.2 Markings. Mechanical visual signals shall be marked with a legend or symbol that is descriptive of the information being given.
5.4.3 Luminance.
5.4.3.1 Flags. The markings on flags shall be as luminous as the markings on the indicator or display in which it is mounted.
5.4.3.2 Indicators. Indicator luminance for lighted instruments shall be in accordance with
MIL-L-25467.
5.5 Tactile signals. If tactile signals are used, they should be of such amplitude as to be detected by the part of the body being stimulated, and should be delivered by an apparatus that will always be in contact with the body. Tactile signals shall also be coded such that they could not be misconstrued as a normal vibration of the equipment or crew station. Any use of tactile signals in aircrew stations must have prior approval by the acquiring activity (see 6.3.1).
6. NOTES
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