1. What is Mean Time to Repair?

Mean Time to Repair (MTTR) is a maintenance metric that measures the average time required to troubleshoot and repair failed equipment or systems. It represents the average downtime experienced for each repair event.

2. How Does the Calculator Work?

The calculator uses the MTTR formula:

Where:

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

Explanation: This calculation provides the average time it takes to restore equipment to normal operation after a failure occurs.

3. Importance of MTTR Calculation

Details: MTTR is crucial for maintenance planning, resource allocation, and improving operational efficiency. Lower MTTR values indicate faster repair capabilities and reduced downtime.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is considered a good MTTR value?
A: Good MTTR values vary by industry and equipment type. Generally, lower values are better. Critical equipment should have MTTR under 4 hours, while non-critical equipment may have higher thresholds.

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, maintenance procedures, and equipment complexity all impact MTTR.

Q4: How can we reduce MTTR?
A: Improve training, maintain spare parts inventory, implement predictive maintenance, standardize procedures, and use better diagnostic equipment.

Q5: Should travel time be included in MTTR?
A: Yes, MTTR typically includes all time from failure detection to full restoration, including travel, diagnosis, repair, and testing time.