Social Support Network Introduction People in a patient's social support network include family members, spouses, children and friends.
Examine wiring and perform continuity test. Ashoggi; 16 March Ashoggi; 14 March Usually, failure analysis teams list each hypothesized failure cause as likely, unlikely, or unknown. This ties back to our earlier discussion in which we advised against tearing a system apart immediately after a failure without knowing what to look for.
These analysis tools reveal to the analysts what to look for when disassembling the system, as well as when conducting other activities to evaluate the likelihood of each potential failure cause.
The assignment column is also used for general comments describing progress in evaluating each event, significant findings, and other information. A review of this column should provide a general indication of an ongoing failure analysis' status.
Most word processing packages include a tables feature, and if possible, a computer should be used during the meeting to update the failure analysis status in real time. Each of these are discussed below. The basic premise of this analysis is that the system has been performing satisfactorily until the failure occurred; therefore, something must have changed to induce the failure.
Potential changes include system design, manufacturing processes, suppliers, operators, hardware lots, and perhaps other factors. One has to do this in a systematic manner.
Changes are always being introduced, and when a change is discovered, it doesn't necessarily mean that it caused the failure. Design changes can be identified by talking to the engineers assigned to the system.
Procurement specialists should be asked to talk to suppliers, as changes may have occurred in procured components or subassemblies. We've found that it also makes sense to talk to the people responsible for maintaining the engineering drawings this function is normally called configuration management or document control.
The people responsible for maintaining the engineering design package normally keep records of all design changes, and they can frequently identify changes the design engineers may not remember.
Manufacturing process changes are sometimes more difficult to identify. Assembly technicians, their supervisors, and inspectors may be able to provide information on process changes.
The manufacturing engineers and quality engineers assigned to the system may have information on process changes. Most companies have written work instructions, and sometimes records are kept when these documents are changed, so the work instruction history should also be researched.
Tooling changes can be similarly identified. Companies often keep tooling release records, so these, too, should be reviewed.
Look around the work area for tools not identified in the assembly instructions or otherwise authorized. Sometimes manufacturing personnel use their own tools, and these might be changed without any documentation. If the system in which the failure occurred was manufactured in a facility that uses statistical process control, process changes may be more readily available.
Ordinarily, process changes are noted on statistical process control charts.
Another area to search for potential changes is in the system operating environment. Sometimes a subtle environment change is enough to induce a failure. It makes sense to evaluate the environment in which the failed system operated against the environmental capabilities of the system.
Even though the system may have been operating in its specified environment when the failure occurred, it is not unusual to discover that as a result of a design oversight, one or more of the system's components or subassemblies are being asked to operate outside of their rated environment.
For example, power supplies in enclosed electronic cabinets may be operating in temperatures higher than the designer intended. Before leaving the "what's different? Recall that at the beginning of this discussion we identified a basic premise, which was that a change occurred to induce the failure.
This may not be the case. Sometimes nothing has changed and the failure resulted from normal statistical variation. There's another possibility, and that is that the failure may have been occurring all along, but it was not previously detected. Due to normal quality assurance and other record keeping requirements, most companies have a fairly extensive paper trail.
Pedigree analysis involves studying this paperwork to determine if it shows that the components and subassemblies identified in the fault tree meet requirements.3 Hours Ago. The Maldives, famous for its luxury resorts on palm-fringed islands, is the latest in a number of small countries where China has invested millions of dollars building highways and.
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