This section provides guidelines and a procedure to determine the number of spares needed at each location. The number of spares for each field replaceable unit (FRU) must be determined and maintained separately, based on that FRU's in-service population at each given location.
Lead time, or turnaround time is the elapsed time between a known FRU failure at a given service location and the arrival of a repaired (or new) FRU at the location where spare circuit packs are stocked to maintain a spare FRU level consistent with the population in service.
Important!
The number of spares for each code must be determined and maintained separately, based on the in-service population of the code at each location.
Lead time should not be confused with mean time to repair, which is the elapsed time between discovery of the failure of an in-service FRU and when a replacement is put into service.
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