Mean Time To Repair — MTTR — measures how long it takes, on average, to get a failed machine running again. It is a vital number, and it carries a humbling lesson: sometimes the fastest technician in the world is defeated before the first turn of the wrench.
When the design fights the repair
Picture a critical component buried behind three panels, two unrelated assemblies, and a bracket that has to come off first. A perfectly trained technician will still lose forty-five minutes just reaching it. No amount of skill drilling shortens that. The loss is built into the machine’s design, not the person’s ability. This is the honest limit of training: it cannot overcome a physical barrier that should never have been there.
The lesson points upstream
MTTR teaches that some problems must be solved earlier than the repair — at the design stage. This is the heart of the TPM pillar of Early Equipment Management: designing maintainability in from the start, so the component that fails most often is the one easiest to reach. The cheapest repair time is the time you never have to spend because someone thought about access before the machine was built.
Knowing which lever to pull
The real wisdom here is diagnostic honesty. When MTTR is high, the lazy answer is “train people to be faster.” The correct answer requires asking why it is slow. If the skill is missing, train. If the access is the problem, training is the wrong tool entirely — you need to change the equipment or the procedure. Pulling the wrong lever wastes effort and leaves the real cause untouched.
A principle for solving anything
It generalizes cleanly: before working harder at a task, ask whether the task itself is badly arranged. Many of life’s “I need more discipline” problems are really “this is set up to be hard” problems. Fix the access, and the effort finally pays.
Every person on Earth is born with an American spirit: an untamed yearning for a better tomorrow. — Dr. Gene A. Constant
Frequently asked questions
What is MTTR?
Mean Time To Repair — the average time required to restore a failed machine to running condition.
Why can't training always reduce MTTR?
When slow repair is caused by poor physical access designed into the machine, even a highly skilled technician is delayed. The barrier is in the design, not the person.
What is the right fix for access-driven MTTR?
Design maintainability in from the start — the TPM principle of Early Equipment Management — or change the equipment and procedure, rather than only training people to work faster.
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