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SAE ARP4822
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SAE ARP4822 Revision A, August 2017 Night Vision Imaging System (NVIS) Compatible Illuminated Pushbutton Switches and Indicators
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Description / Abstract:
This SAE Aerospace Recommended Practice (ARP) reviews the basics of NVIS compatibility and discusses the specific illuminated pushbutton switch and indicator requirements for sunlight readability, color, luminance, and NVIS radiance when used in NVIS compatible cockpits.
The recommendations and special considerations set forth in this document are made to give the design engineer a better understanding of MIL-L-85762A and MIL-STD-3009 NVIS compatibility requirements and to provide information on the visual characteristics of NVIS compatible pushbutton switch and indicators. The recommendations are primarly for military aircraft since civilian aircraft FAR requirements typically do not cover NVIS applications with the exception of those covered by RTCA/DO-275.
Purpose
The purpose of this document is to recommend the design requirements and considerations which the design engineer should observe when selecting and using NVIS compatible illuminated pushbutton switches and indicators.
NVIS compatible lighting is defined as any lighting whose spectral radiance has been selectively filtered to meet the NVIS radiance and chromaticity requirements of MIL-L-85762A or MIL-STD-3009 when dimmed to the specified luminance value. With the introduction of LEDs as a lighting technology, the use of filtering for NVIS compatibillity is lessened or not required. In addition, LEDs now allow NVIS radiance limits to be achieved with more saturated chromaticity coordinates thereby allowing color selections that are closer to or within the original Aviation colors requirements. For example, using LEDs would allow warning lights that can meet the Aviation Red requirements but not the NVIS Red requirements since the chromaticity coordinates are now outside the 1976 CIE circle limits but still meet the NVIS requirements. Since the original NVIS requirements were based on filtered incandscent lamps, they had to allow changes in the Chromaticity limits to achieve pushbutton switches that would not impact the visual acuity of the Night Vision Goggle (NVG).
The recommendations and special considerations set forth in this document are made to give the design engineer a better understanding of MIL-L-85762A and MIL-STD-3009 NVIS compatibility requirements and to provide information on the visual characteristics of NVIS compatible pushbutton switch and indicators. The recommendations are primarly for military aircraft since civilian aircraft FAR requirements typically do not cover NVIS applications with the exception of those covered by RTCA/DO-275.
Purpose
The purpose of this document is to recommend the design requirements and considerations which the design engineer should observe when selecting and using NVIS compatible illuminated pushbutton switches and indicators.
NVIS compatible lighting is defined as any lighting whose spectral radiance has been selectively filtered to meet the NVIS radiance and chromaticity requirements of MIL-L-85762A or MIL-STD-3009 when dimmed to the specified luminance value. With the introduction of LEDs as a lighting technology, the use of filtering for NVIS compatibillity is lessened or not required. In addition, LEDs now allow NVIS radiance limits to be achieved with more saturated chromaticity coordinates thereby allowing color selections that are closer to or within the original Aviation colors requirements. For example, using LEDs would allow warning lights that can meet the Aviation Red requirements but not the NVIS Red requirements since the chromaticity coordinates are now outside the 1976 CIE circle limits but still meet the NVIS requirements. Since the original NVIS requirements were based on filtered incandscent lamps, they had to allow changes in the Chromaticity limits to achieve pushbutton switches that would not impact the visual acuity of the Night Vision Goggle (NVG).