Levels of Essentiality

LEVELS OF ESSENTIALITY A number of early failures in certain submarine and surface ship systems were traced to use of the wrong materials. This led to a system of prevention that involved levels of essentiality. A level of essentiality is a range of controls, in two broad categories, representing a certain high degree of confidence that procurement specifications have been met. These categories are l verification of material, and l confirmation of satisfactory completion of test and inspections required by the ordering data. Levels of essentiality are codes, assigned by the ship according to the QA manual, that indicate the degree to which the ship’s system, subsystem, or components are necessary in the performance of the ship’s mission. These codes indicate the impact that catastrophic failure of the associated part or equipment would have on the ship’s mission capability and personnel safety. LEVELS OF ASSURANCE QUALITY ASSURANCE IS DIVIDED INTO THREE LEVELS: A, B, or C. Each level reflects certain quality verification requirements of individual fabrication in process or repair items. Here, verification refers to the total level of quality controls, tests, and/or inspections. Level A assurance provides for the most stringent of restrictive verification techniques. This normally will require both quality controls and test or inspection methods. Level B assurance provides for adequate verification techniques. This normally will require limited quality controls and may or may not require tests or inspections. Level C assurance provides for minimum or “as necessary” verification techniques. This level will require very little quality control of tests or inspections. The QA concept involves preventing the occurrence of defects. QA covers all events from the start of a maintenance action to its completion and is the responsibility of all maintenance personnel. By carefully following the methods and procedures outlined in your QA program manuals and by paying careful attention to the quality of work in your area, you will contribute greatly to the operational effectiveness of your ship as well as tended units. For further in-depth knowledge concerning the QA procedures and practices, consult your area COMNAVSURF LANT/ PACINST QA manual. SUMMARY In this chapter, we have discussed some of your important administrative and training responsibilities and the different methods you can use to properly perform these responsibilities. Remember, information is usually available when you need it. You just have to know where to look for it and make the effort to secure it. 1-28