If the total elapsed time for corrective maintenance is 1,200 hours and there are 60 maintenance actions completed, what is the Mean Time to Repair (MTTR)?

To calculate the Mean Time to Repair (MTTR), you divide the total elapsed time for corrective maintenance by the number of maintenance actions completed. In this scenario, the total elapsed time is 1,200 hours, and there are 60 maintenance actions.

The formula for MTTR is as follows:

[ \text{MTTR} = \frac{\text{Total Elapsed Time}}{\text{Number of Maintenance Actions}} ]

Using the provided numbers:

[ \text{MTTR} = \frac{1,200 \text{ hours}}{60} = 20 \text{ hours} ]

This calculation shows that, on average, each maintenance action took 20 hours to complete. Therefore, the value of 20 hours accurately reflects the mean time required for repairs, making it the correct answer. Understanding MTTR is crucial in systems acquisition management because it directly impacts the efficiency of maintenance operations and the overall performance of a system.