The Origins of Predictive Maintenance

The Origins of Predictive Maintenance

Excerpts taken from Mariner's The Origins of Predictive Maintenance.
Original author: Peter Darragh, VP of Delivery at Mariner

The origins of predictive maintenance (PdM) begin with the practice of condition-based maintenance, which many attribute to CH Waddington.

Waddington, along with two Nobel laureates, four Fellows of the Royal Society and a Fellow of the National Academy of Sciences Australia, investigated the "intolerably bread-and-butter affair" of organizing maintenance of the Royal Air Force Coastal Command 502 Squadron.

Previous to Waddington's maintenance recommendations, the squadron was inspecting aircrafts based on planned maintenance schedules as determined by the manufacturer. Some steps required dis-assembling parts of the aircraft so they could be inspected.

After a five-month trial applying their maintenance recommendations, one of the most unexpected findings was, "The rate of failure or repair is highest just after an inspection and thereafter falls, becoming constant after about 40-50 flying hours."  

Waddington and team concluded, "The inspection tends to increase breakdowns, and this can only be because it is doing positive harm by disturbing a reasonably satisfactory state of affairs."

 

Predictive Maintenance Thwarts Waddington Effect

The planned preventative maintenance, the purpose of which was to prevent unplanned failures, was actually creating unplanned failures. This behavior was termed, "The Waddington Effect."

Their advice was to change the maintenance process to be in-tune with the actual condition of the equipment and its actual usage patterns. It was the beginning of conditioned-based maintenance. It was also the beginning of using economic and probabilistic information to determine inspection cycle strategies, which becomes the foundation for predictive maintenance.

If you find yourself fixing the same things on the same equipment over and over again, you may be stuck in The Waddington Effect and need to move to a maintenance approach that is more condition-based and predictive.

Register for our upcoming webcast to learn more about predictive maintenance and how to gather the critical data needed to make your maintenance programs more accurate and efficient.

 

Excerpts taken from Mariner's The Origins of Predictive Maintenance.

Original author: Peter Darragh, VP of Delivery at Mariner