1. What is Mean Time To Repair (MTTR)?

Mean Time To Repair (MTTR) is a maintenance metric that measures the average time required to repair a failed component or system. It represents the average duration between the start of a repair and the moment the system returns to operational status.

2. How Does the Calculator Work?

The calculator uses the MTTR formula:

Where:

• \( \text{Total Repair Time} \) — Sum of all repair durations in hours
• \( \text{Number of Repairs} \) — Total count of repair incidents

Explanation: This formula calculates the average repair time by dividing the total time spent on repairs by the number of repair events during a specific period.

3. Importance of MTTR Calculation

Details: MTTR is crucial for maintenance planning, resource allocation, and service level agreements. A lower MTTR indicates more efficient repair processes and better system availability.

4. Using the Calculator

Tips: Enter total repair time in hours and the number of repairs as a whole number. Both values must be positive (repair time > 0, number of repairs ≥ 1).

5. Frequently Asked Questions (FAQ)

Q1: What is considered a good MTTR value?
A: A good MTTR depends on the industry and system complexity. Generally, lower values are better. Critical systems should aim for MTTR under 4 hours.

Q2: How does MTTR differ from MTBF?
A: MTTR measures repair time, while MTBF (Mean Time Between Failures) measures reliability between failures. Both are important maintenance metrics.

Q3: What factors affect MTTR?
A: Technician skill, spare parts availability, diagnostic tools, and repair procedures all impact MTTR.

Q4: Should travel time be included in MTTR?
A: Yes, MTTR typically includes all time from failure detection to system restoration, including travel and diagnosis time.

Q5: How can we reduce MTTR?
A: Improve technician training, maintain spare parts inventory, enhance diagnostic capabilities, and streamline repair procedures.