Reliability Centered Maintenance by F. Stanley Nowlon, et al PDF

By F. Stanley Nowlon, et al

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Ay increased not only the number of items that can fail, but the types of failure that can occur. t is essentially an attempt to make earlier designs technologically obsolete, with the usual measure of improvement being potential operating capability (including operating costs). In other words, this is the operating capabiliry expected in the absence of any failures that might change the circumstances. The basis for evaluating new aircraft designs usually includes performancr factors such as the following.

A MODEL OF THE FAILURE PROCFSS So far we have discussed a reduction in failure resistance that is evidenced by some visible condition. 5. The measure of exposure may be calendar time, total operating hours, or number of flight or landing cycles, depending on the item. Because the measurable events occur over time, it is common to refer to total exposure as the age of an item. Possible measures for the stress scale are even more varied. Stresses may include temperature and atmospheric conditions, vibration, abrasion, peak loads, or some combination of these factors.

By the same token, differences between the testing environment and the field environment SECTION 2 -2 23 will sometimes result in unverified failures for items that are actually suffering functional failures in the field. Units removed from equipment either as potential failures or because of malfunctions are termed premature removals. This term came into use when most equipment items had a fixed operating-age limit. A unit removed when it reached this limit was “time-expired,” whereas one removed because it had failed (or was suspected of having failed) before this age limit was a “premature” removal.

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Reliability Centered Maintenance by F. Stanley Nowlon, et al


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