MAINTAINABILITY DESIGN TECHNIQUES METRIC - AcqNotes.com

Downloaded from http://www.everyspec.com on 2011-10-29T14:56:01.6-7 IDENTIFICATIONCHECKLISTSDOD-HDBK-791(AM)Table 6-4 lists items to consider for proper identification.Several items are included that were not discussed inthe text, but they are included here because they areimportant to good design and might otherwise be overlooked.The designer, maintainability engineer, humanfactors engineer, product engineer, and ConfigurationManagement Office must work together during design toinsure that all facets of proper identification are covered.When evaluating the design in accordance with the checklist,if the answer to any question is “no”, the designshould be studied carefully to determine the need for, andproper application of, improvements in identification.Figure 6-22. Nuclear Radiation HazardWarning SymbolTABLE 6-4. IDENTIFICATION CHECKLIST1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.Are all units labeled and, if possible, with full identifying data?Are parts stamped or labeled with relevant characteristics information?Are structural members stamped with physical composition data—e.g., can be welded; is flammable?Is each terminal labeled? Does the label have the same code symbol as the wire attached to it?Are labels on components or chassis (not parts) etched or embossed in lieu of stamping or printing?Are labels placed for full, unobstructed view?On equipment using color coding, is the meaning of the colors given in manuals and on an equipment panel?IS color coding consistent throughout the system; are displays and controls the same color?Are numeral and letter designs used that have simple configurations equivalent to typed letters?Are capital letters used for labels and standard capitalization, and lowercase type used for extended text material?Are the lowercase "ell” (1), I, and 1 distinguishable from each other for the selected font; capital “oh” (O) from zero(0)?Have standard abbreviations been used?Are instructions brief, i.e., unnecessary words and punctuation omitted?Are display labels imprinted, embossed, or attached in a manner that they will not be lost, mutilated, or becomeunreadable?Do display and control labels clearly indicate their functional relationship? Are displays labeled by functionalquantity—i.e., gal, psi, ohms—rather than by operational characteristics?Does displayed printed matter always appear upright to the technician from his normal viewing position?Do adequate labels appear on every item the technician must recognize, read, or manipulate?Does display of the sequence of use of controls appear as a number on each control (for fixed procedure operation)?Are display labels attached to each test point, and do they show intolerance or limits that should be measured at thatpoint?(cont’d on next page)6-17