MIL-PRF-38039D
2.4 Order of precedence. Unless otherwise noted herein or in the contract in the event of a
conflict between the text of this document and the references cited herein, the text of this document
takes precedence. Nothing in this document, however, supersedes applicable laws and regulations
unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample shall be subjected to a first article
inspection in accordance with 4.2.
3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered,
or environmentally preferable materials should be used to the maximum extent possible,
provided that the material meets or exceeds the operational and maintenance requirements, and
promotes economically advantageous life cycle costs.
3.3 Materials. Al materials shall be suitably treated to resist corrosion due to electrolytic
decomposition, fungus, salt spray, and any other atmospheric condition that may be encountered
during operational use and storage.
3.3.1 Nonmagnetic materials. Nonmagnetic shall be used for all parts, except where
magnetic materials are essential.
3.3.2 Toxic chemicals, hazardous substances, and ozone depleting chemicals (ODCs).
The use of toxic chemicals, hazardous substances, or ODCs shall be avoided, whenever feasible.
3.4 Design. The design criteria, display, and presentation characteristics of the
indicators and their corresponding systems shall be in accordance with MIL-STD-411. All
components shall be readily accessible.
3.4.1 Indicator display.
3.4.1.1 Dimensions. The length of indicator displays shall not exceed 1.500 ± 0.015
inches. The minimum height of letters in the individual legends shall be as specified in SAE-
AS18012. The legend marking shall be a minimum of 0.140 inch high unless more than one line
is required in which case it shall be a minimum of 0.125 inch high.
3.4.1.2 Visibility and legibility. All legends shall be sharply defined and readable when
viewed from within an operational environment. When illuminated, the visibility of all legends
shall not be restricted by the periphery of the enclosure for the indicator display.
3.4.1.3 Lighting requirements.
3.4.1.3.1 High ambient lighting conditions. Legend visibility and legibility under high
ambient lighting conditions shall be provided. Contrast between the lighted and unlighted
portions of each indicator display, under ambient lighting conditions, shall be at least 1.0 when
energized at rated voltage (5V).
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