LEVELS OF ESSENTIALITYA number of early failures in certain submarine andsurface ship systems were traced to use of the wrongmaterials. This led to a system of prevention thatinvolved levels of essentiality. A level of essentiality isa range of controls, in two broad categories, representinga certain high degree of confidence that procurementspecifications have been met. These categories arel verification of material, andl confirmation of satisfactory completion of testand inspections required by the ordering data.Levels of essentiality are codes, assigned by the shipaccording to the QA manual, that indicate the degree towhich the ship’s system, subsystem, or components arenecessary in the performance of the ship’s mission.These codes indicate the impact that catastrophic failureof the associated part or equipment would have on theship’s mission capability and personnel safety.LEVELS OF ASSURANCEQUALITY ASSURANCE IS DIVIDED INTOTHREE LEVELS: A, B, or C. Each level reflects certainquality verificationrequirements of individualfabrication in process or repair items. Here, verificationrefers to the total level of quality controls, tests, and/orinspections. Level A assurance provides for the moststringent of restrictive verification techniques. Thisnormally will require both quality controls and test orinspection methods. Level B assurance provides foradequate verification techniques. This normally willrequire limited quality controls and may or may notrequire tests or inspections. Level C assurance providesfor minimum or “as necessary” verification techniques.This level will require very little quality control of testsor inspections.The QA concept involves preventing the occurrenceof defects. QA covers all events from the start of amaintenance action to its completion and is theresponsibility of all maintenance personnel.By carefully following the methods and proceduresoutlined in your QA program manuals and by payingcareful attention to the quality of work in your area, youwill contribute greatly to the operational effectivenessof your ship as well as tended units. For further in-depthknowledge concerning the QA procedures andpractices, consult your area COMNAVSURF LANT/PACINST QA manual.SUMMARYIn this chapter, we have discussed some of yourimportant administrative and training responsibilitiesand the different methods you can use to properlyperform these responsibilities. Remember, informationis usually available when you need it. You just have toknow where to look for it and make the effort to secureit.1-28
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