The following figure illustrates the multi-echelon inventory structure for repairable/rotable parts materials management.
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An inoperative part is removed at one of the depots, is declared unserviceable, and is sent to the Base for repair.
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A part from the local depot inventory is taken to replace the part that has been removed. If there is no part available
in the inventory, a backorder at the local depot is created, and remains open until a serviceable part arrives from the Base.
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A request is sent by the depot to the Base to ship a serviceable part from the on-hand Base inventory to the depot.
If there is no part available in the on-hand Base inventory, then a backorder is created at the Base level, and remains
open until a part becomes available in the on-hand Base inventory to fulfill that backorder.
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An unserviceable part shipped from the depot enters the repair cycle at the Base. Once the repair cycle is completed,
the part is added to the on-hand Base inventory.
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