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Size & Metering Plate Configurations
ARINC 600 Size Configurations
ARINC 600 avionics equipment is based on the installation concept designated Modular Concept Unit (MCU), which has a fixed height and length. Unlike ARINC 404 standards, ARINC 600 avionics equipment only comes in the short box size and is designated in multiples of 1 MCU (e.g. 2 MCU, 3 MCU, 4 MCU, etc.). MCU length is the approximate equivalent to an ATR short. To meet ARINC 600 standards, tray proportions comply with the same system. As a result, a 4 MCU equipment box would use a 4 MCU tray.
To accomplish the successful installation of ARINC 600 avionics equipment on an ARINC 404 compatible rack, or where 404 ATR boxes are to be installed on aircraft that contains ARINC 600 equipment, ARINC 600 trays come in short/short and short/long size configurations (as illustrated below).
When specifying ARINC 600 mounting trays, it is not only important to know the equipment size, but installation requirements as well. A review of the following pages will help you to determine the specific tray for your needs.
Metering Plates
ARINC 600 trays that are mounted on forced air cooling shelves will require a special metering plate to regulate the movement of air. Metering plates are mounted in a deformation in the tray bottom, sealed with a special gasket, and equipped with metering plugs to regulate air flow as needed.
Inlet holes for ECS metering plates run 0.38" in diameter for 2 MCU ARINC 600 trays and 0.81" in diameter for all other ARINC 600 tray sizes.
Illustrated above are typical ARINC cutouts and metering plate sizes. Contact the ECS Customer Service department if you need additional size or cooling information for putting together a design analysis.