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SPDA
Also from: Secondary power distribution assembly
This is an electrical loads management and power distribution device. It distributes power from the ICCs to aircraft systems. One SPDA is in the forward e-bay, one is in the mid e-bay. Each SPDA has slots where different electronic modules are connected (similar to PCI slots in a PC). Each module has a function providing communication, data processing, and power distribution.
The SPDAs have built-in test functionality.
Electronic remote CBs are in the SPDAs.