Repairs nearby stationary vehicles, buildings, and emplacements that are out of combat.
The Forward Repair Assembly is a UKF structure. In skirmishes it is exclusive to the British Armored Battlegroup. Once the appropriate battlegroup perk of the same name is attained, the Royal Engineer Section (aka Sappers) unit gains the ability to construct this structure. It can be built in any friendly territory, including outside the HQ territory.
Once construction is complete, the Forward Repair Assembly will spawn two unarmed and untargetable Sappers that will idle next to the structure. These two entities will move out within a certain range and repair any nearby damaged friendly vehicle or structures, including the repair assembly itself.
The repair rate of the Forward Repair Assembly is +8 health per second, which is the same as most default repair rates for various engineer units.