SAE ARP 6253A:2017 pdf free

SAE ARP 6253A:2017 pdf free.LEDs and Aircraft Applications
The purpose of this SAE Aerospace Recommended Practice (ARP) is to recommend minimum design criteria which will lead to adequate performance standards for LED products in and on aircraft. This document recommends design and performance criteria for developing products subject to CFR Parts 23, 25, 27, and 29 certification that use light emitting diodes (LED) as their primary source of light for luminance and iluminance applications. It is intended as guidance for the certifying authority and lighting design engineers. This document includes, but is not limited to commercial aircraft.
The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and 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.
The optical performance of a Lighting Assembly can be significantly affected by the LED selection and how this device affects the fundamental performance and architecture of the overall lighting system. It should be understood that these aspects of LED lighting and their design from the component level on through to the system design have significant impact on the electronic circuit design and complexity; the mechanical, environmental and thermal design, choice and implementation of the optical design and a variety of performance considerations, including long term intensity, color performance, and lifetime. The electrical drive circuit must be designed to consider the LED’s operating limitations. Electrical overstress can reduce life. The LED drive current has a direct relationship to the LED junction temperature, as the junction temperature increases the life of the LED decreases. Some examples of these impacts are identified in 3.1.1 and 3.1.2.SAE ARP 6253A pdf free download.