MIL-STD-1911A
4.1.5 Fail-safe design. To the greatest extent feasible, the HEO shall incorporate design features that render the HEO incapable of attaining or maintaining an armed state and of functioning upon the failure, improper assembly, omission, or out-of-sequence operation of components.
4.1.6 Human factors engineering. HEO design shall emphasize human factors engineering to eliminate or control the hazards associated with manual operations.
4.1.6.1 Design simplicity. HEO design shall be as simple as possible to minimize operator error.
4.1.6.2 Design ruggedness. The design of the HEO shall be rugged enough to permit exposure of the HEO to the environments and handling stresses anticipated in its life cycle with no deterioration or degradation of its safety system.
4.1.6.3 HEO assembly and setting. The HEO shall be designed so that it cannot be assembled in the armed condition or in a condition that compromises the intended level of safety. If the state of the HEO is to be checked or set after assembly of the HEO, such checking or setting shall be positive and unambiguous, and shall not degrade safety.
4.1.6.4 Manually operated safety features. Manually operable safety features critical to system safety shall be designed to minimize inadvertent or unintended operation. Unless otherwise specified in the requirements document, operation of these features shall be reversible.
4.1.6.5 Operational status indicator. The HEO safety system shall provide the user a positive indication of its operational status, compatible with the intended environments where the HEO will be handled. The HEO safety system shall discriminate between safe and unsafe operational conditions and shall provide the user with clear warning consistent with the specific HEO design.
4.1.6.5.1 Non-armed and armed condition indicator. HEO shall provide a positive, unambiguous indication of the non-armed and armed conditions. Indicator failure shall not result in a false non-armed condition indication.
4.1.6.5.1.1 Visual indication. If visual indication of the non-armed or armed condition is employed in the HEO, visible indicators shall be designed to provide a positive, unambiguous indication of condition. If color coding is used to represent condition, the colors and coding shall be as follows:
a. Non-armed condition. Fluorescent green background with the letter S or word
SAFE superimposed thereon in white. Colors shall be nonspecular.
b. Armed condition. Fluorescent red or fluorescent orange background with the letter A
or the word ARMED superimposed thereon in black. Colors shall be nonspecular.
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