Solutions to prevent galley Light-Emitting Diode (LED) discoloration

Effectivity: Global 6000 and Global 6500 aircraft

ATA: 33

By: Sebastien Desmitt—Technical Services  

As communicated in a previous article, Bombardier has issued modification drawings to improve the ventilation of the upper light and work light boxes in the galley, available in engineering package (RAZ-BM700-238). This package may be obtained free of charge via a Service Request for Product Support Action (SRPSA).

For the upper light on some Global 6000 and Global 6500 aircraft, the air temperature inside the light box was higher than expected because the hot air extraction holes were clogged by insulation bags touching the upper light box. For the work light on some configurations, the vent hole was not efficient in extracting hot air. This may result in LED light discoloration for both light boxes after many cycles. Once LED lights change color, they lose their original brightness.

On the upper light box, the modification consists of adding spacers to raise insulation bags on top of the box to evacuate the heat. To do so, spacers are bonded after removing the lens and the LED strip.

On the work light box, the modification consists of increasing the size of the actual hole and adding a new hole, both of which are behind the galley touch screen. These holes will facilitate the evacuation of heat generated by the LED.

Additionally, it is possible to adjust and store the brightness intensity value of each galley work/nights and overhead lights. This can be done by using the Goodrich Hella Aerospace Lighting Systems Maintenance Software to “dim” the upper and work/night lights as they contribute to reduce power dissipation (heat) of the individual wash lights.

All technical instructions are available in the Reference Information Letter RIL GX-0576 , which can be downloaded from the Customer Portal.