ARINC 404 specifies the mechanical dimensions of line replaceable units (LRUs) and their installation systems at different locations on the aircraft. LRUs are installed on specially designed trays, providing mechanical support, but also offering shock absorption, cooling, and insertion functions.
ATR is increasingly deployed in wheeled and tracked ground vehicles, and is also used for onboard applications. Each application is affected by a series of harsh environmental factors, including impact, vibration, temperature, moisture, and salt, which need to be considered. Today, ATR has been introduced into applications that were never imagined before, including surveillance, data collection, storage, and weapon control. Convection and conduction cooling ATR (Air Transport Rack) cabinets provide standardized and cost-effective solutions for applications based on PCI, VME, VME64x, VXS, cPCI, and VPX. Provide 1/2, 3/4, 1, and 1 1/2 ATR high length or high short formats according to ARINC 404A, ARINC 600, and IEEE 1101.10 specifications
Usually, ATR is made of stamped aluminum plates and milled or brazed aluminum plates. The detachable front panel allows for I/O customization to meet specific application requirements and increase configurability. The ATR casing uses electrostatic dust filters, honeycomb EMI filters, and narrow screw spacing to seal each external seam to ensure compliance with MIL-STD-461. The sturdy design meets the requirements of MIL-STD-810, MIL-STD-167, and MIL-STD-901D for impact, vibration, and structural integrity.
Related standards:
MIL-STD-5400: General Standard for Aerospace Electronic Equipment
MIL-STD-810: Environmental Testing Methods and Engineering Guidelines
MIL-STD-46I: EMI Emission and Sensitivity Control Requirements
MIL-STD-704: Aircraft Electrical Characteristics
MIL-STD-1275: Characteristics of 28 VDC Electrical Systems in Military Vehicles