What is BS EN 4705 about?
BS EN 4705 is a European standard that has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN), that discusses light and lighting of aircraft cabins.
BS EN 4705 describes the measurement method for the lifetime behaviour of aircraft cabin light units in a standardized aircraft-related environment.
Who is BS EN 4705 for?
BS EN 4705 on measurement methods of lifetime behaviour of light units is relevant to:
- Aerospace industry
- Aircraft cabin light manufacturers
- Aeronautical engineers
- Product design engineers
- Quality control and testing personnel
- Maintenance authorities
Why should you use BS EN 4705?
The light output of all light sources decreases over time and the chromaticity coordinates may change. Because of a longer lifetime of modern light sources, like LEDs, a brightness decrease, or a chromaticity locus shift can be expected more often than a complete failure of the light source.
BS EN 4705 is applicable to all kinds of aircraft cabin light sources including those with means for ageing compensation.
Light units provide illumination for both exterior and interior use. Lights on the exterior provide illumination for such operations as landing at night, an inspection of icing conditions, and safety from a mid-air collision. Interior lighting provides illumination for instruments, cockpits, cabins, and other sections occupied by crewmembers and passengers. Certain special lights, such as indicator and warning lights, indicate the operation status of equipment. In this regard, BS EN 4705 guides you in the various aspects and parameters set for measuring and inspecting the behaviour of light units.
If you are a design engineer or manufacturer of light units, adopting best industry guidance recommended by BS EN 4705 for the measurement of lifetime behaviour of light units, can help ensure operational efficiency and high-performance of the aircraft. With the accurate and timely identification of failure modes, risks arising from the failure of light units and low brightness can be effectively mitigated. Installation guidelines in accordance to BS EN 4705 can also avoid light units from vibration and shock.
