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Glossary:Field Replaceable Unit
(FRU) At field service, an FRU is the level of sub-assembly that would normally be exchanged to effect a repair, the FRU subsequently being returned to a service depot for repair. Equivalent terms, for the purposes of SJTAG discussions, may include LRU (Line Replaceable Unit) and SRI (Shop Replaceable Item).
Line Replaceable Unit, Shop Replaceable Item.