Definitions and assumptions 5
Calculating spares requirements
Replaceable items and their associated failure rates are listed in this
document. Quantities of spares required to stock a depot for the one-year
sparing interval can be calculated by following the procedures. Table 1
translates the NPT values to the number of spares required for that item.
The following values are used:
N-The number of a spares item in use.
F-The failure rate for a particular spares item.
T-The turnaround time for repairing a failed spares item in hours.
Procedure 1 explains how to calculate the quantities of spares required to
stock a depot for the one-year sparing interval:
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:
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Spares planning 553-3001-l 53