VI. Maintainability and Availability
B. Maintenance and testing analysis
1. Preventive maintenance (PM) analysis (Apply)
Define and use PM tasks, optimum PM intervals, and other elements of this analysis, and identify situations in which PM analysis is not appropriate.
Preventing downtime or system failures is useful and often can be improved saving time and money.
Additional References
Data to Collect to Optimize Maintenance (article)
Preventive Maintenance or PM Goals and Activities (article)
Quick Quiz
1-112. Consider the planned cost of preventive maintenance (CPM) and the cost of corrective maintenance (CCM) for a critical complex system. What should be the ideal relationship between CPM and CCM?
(A) CCM > CPM
(B) CCM >> CPM
(C) CPM > CCM
(D) CPM >> CCM
(B) CCM >> CPM
The investment in preventative maintenance permits the avoidance of unplanned failures. If the cost of prevention case as much or more than the cost of a failure, then it is not a good investment. Ideally, we could cost effectively prevent failures from occurring.
1-120. Which of the following would be considered a best practice for sustaining high system reliability in the field?
(A) Fully analyze all failures.
(B) Compile detailed reports on all major failure modes.
(C) Optimize the maintenance team scheduling and spare stocking systems.
(D) Follow a preventive maintenance program with scheduled diagnostic checks.
(D) Follow a preventive maintenance program with scheduled diagnostic checks.
Avoiding the occurrence or identifying early signals of impending failure allow the team to prepare and execute repairs with minimal unscheduled downtime.
1-121. Identify which of the following would be a primer characteristic of a preventive maintenance program.
I. the replacement of items just before they fail
II. a planned program of tests, inspections, and replacements
III. the replacement of failed items as they are found in normal service use
(A) I only
(B) II only
(C) I and III only
(D) II and III only
(B) II only
The idea of preventive maintenance is to avoid failures by properly maintaining and repairing equipment.
Predictive maintenance uses monitoring or time to failure estimates to replace items before failure. Corrective maintenance is the approach that finds and repairs existing failures.
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