How to Reverse the Preventive/Corrective Maintenance Ratio Without Major Investment?

Your preventive plans exist inthe CMMS, but tasks keep slipping week after week. The dashboard shows apreventive/corrective ratio that stagnates or even declines.
The issue isn'talways a lack of plans — it's often that the plans in place don't generate tasks at the right time, that those tasks aren't completed on schedule, or that noone is measuring the gap between what was planned and what was done.

On the ground, maintenance managers who try to optimize their preventive plans based on real breakdown history run into the same obstacle: corrective maintenance consumes the timeavailable for preventive work, and without reliable data, it's hard to know where to focus first.

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Why Corrective Maintenance Feeds Itself

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A reactive maintenance teamproduces less intervention documentation. Without a reliable history, it'simpossible to identify equipment that breaks down regularly and assign anappropriate maintenance plan to it. Urgency takes over, data accumulates poorly,and existing plans slip for lack of time to execute them.

The cycle is mechanical: if yourtechnicians spend most of their time on unplanned interventions, the remainingtime for preventive tasks is insufficient. The ratio degrades on its own.

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Execute Existing Plans Before Creating New Ones

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The first lever isn't to multiply maintenance plans — it's to execute the ones that already exist. On many sites, a significant share of scheduled preventive tasks is not completed on time. The reasons are recurring: corrective overload, spare parts unavailable at the time of the intervention, or production-driven reprioritization that pushes preventive tasks to the following week.

To act, you first need to measure. A dashboard filterable by equipment or period lets you visualize the ratio of completed tasks to scheduled tasks without rebuilding a report every week. Mobility Work's analytics module exposes this indicator directly.

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Choose the Right Trigger Mode
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Not all equipment is suited to the same type of scheduling. A fixed-date maintenance plan works for regulatory inspections or constant-frequency maintenance. But for equipment whose workload varies by month, triggering a task based on an hour, cycle, or volume counter is more relevant: you intervene at the right time — not too early, not too late.

Here's how it works in practice: a maintenance manager configures a maintenance plan on a critical piece of equipment, selecting a counter-based trigger with a threshold of 500 operating hours. When the reading reaches the threshold, a task is automatically generated and assigned to the responsible technician, with the intervention description, required spare parts, and the associated quality checklist. The technician completes the task, logs the activity and counter readings, then closes it. The next threshold is immediately recalculated and the cycle resumes— no manual entry, no risk of oversight.

For interventions where the interval should run from the last actual completion, a third mode exists: the task-closure trigger. The next task date is automatically recalculated from the date of the last recorded activity, not from a fixed calendar date.

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Identify Equipment That Concentrates Corrective Work

Not all equipment contributes equally to the corrective workload. Ranking corrective interventions by equipment, failure type, and frequency often reveals that a minority of machines generates the majority of unplanned breakdowns. These are the priority candidates for strengthening or creating preventive plans.

The intervention history in the CMMS, if well maintained, directly provides this analysis base.

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What Changes Over Time?

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Behind the preventive/corrective ratio lies a concrete financial issue: equipment lifespan. Primarily reactive maintenance accelerates wear and moves up replacement timelines. Every year gained on the lifespan of a critical piece of equipment represents real savings on the capital budget — an argument often more compelling to management than simply reducing the number of breakdowns.
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Where to Start?

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Three actions to begin the transition:

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1. Measure your current ratio: classify your interventions from the last three months as planned /unplanned. This number is your starting point.

2. Identify the 5 most corrective pieces of equipment: build their history and evaluate whether a fixed-date or counter-triggered preventive plan could anticipate recurring failures.

3. Track the completion rate of your existing plans: if preventive tasks are regularly slipping, understand why before creating new ones.