Figure 3-22.-Format used in preparing revision blocks.sizes of the blocks differ (fig. 3-22). RevisionA brief description of each change isinformation is entered chronologically starting atthe top of the revision block.Revision letters are used to identify a changeor revision to a drawing. Uppercase letters areused in alphabetical sequence, omitting theletters I, O, Q, S, X, and Z. The first revision toa drawing is assigned the A. On a drawing, allchanges that are incorporated at one time areidentified by the same revision letter. The changesmay be numbered sequentially to permit readyidentification of a specific change. In this case,the appropriate serial number will appear as asuffix to the revision letter (for example, A1, A2,A3, etc.). Whenever possible the revision letterwill be placed near the actual change on thedrawing. It should be placed so it is notconfused with other symbols on the drawing.Usually, the revision letter is placed inside of acircle or triangleIf a circle or tri-angle is used on the drawing, it should also be usedin the revision block.made in the description column, adjacentto its revision letter, in the revision block.The approval signature and date of revisionare also entered in the appropriate columns.For all drawings prepared by Architect/Engineer(A/E) firms, the revision block should includea separate PREPARED BY column (fig. 3-22,view B).The zone column on the standard revisionblock is normally omitted on constructiondrawings but may be used in reviewing maps.Zones are indicated by alphabetical or numericalentries and are evenly spaced in the margin forlocating an object on the drawing or map. Useof zoning is described in DoD-STD-100C.Like title blocks, revision blocks may vary witheach command, and you will be required to followcommand guidelines. The procedure for makingrevisions to drawings is covered in DoD-STD-100C.3-18
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