MIL-PRF-38169A
(Application for copies should be addressed to American Society for Testing and Materials, 100
Barr Harbor Dr., West Conshohocken, PA 19428-2959.)
RADIO TECHNICAL COMMISSION FOR AERONAUTICS (RTCA)
RTCA/DO-160
-
Environmental Conditions and Test Procedures for
Airborne Equipment
(Application for copies should be addressed to RTCA Inc., 1140 Connecticut Avenue, NW, Suite
1020, Washington, DC 20036-4001.)
2.4
Order of precedence. 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
Materials. All 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 or storage.
3.2
Design and construction. The visor and goggle lens shall be in accordance with the
applicable specifications or drawings. Figure 1 is an example of a typical lens showing test
reference point C and the location of critical and noncritical areas of vision. This figure is a guide
since visor and goggle lens configurations differ for different helmets. Noncritical areas of vision
shall meet the same criteria for optical characteristics as the critical areas of vision except where
otherwise specified.
3.3
Performance.
3.3.1 Prismatic deviation (see 6.3.1).
3.3.1.1 Vertical prismatic deviation. The vertical prismatic deviation between point C for the
right eye and point C for the left eye shall not be more than 0.18 diopters nor shall the vertical
prism at any point in the critical area of vision exceed 0.18 diopters.
3.3.1.2 Horizontal prismatic deviation. The algebraic sum of the horizontal prismatic deviation at
point C for the left eye and at point C for the right eye shall not exceed 0.75 diopters. The
algebraic difference between the horizontal deviation at point C for the left eye and at point C for
the right eye shall not exceed 0.18 diopters.
3.3.2 Refractive power. The refractive power of the visor and goggle lens shall not exceed, by
more than ± 0.06 diopters, the inherent power in a spherical lens with concentric surfaces having
3
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