INTRODUCTION TO PRINT READINGDOE-HDBK-1016/1-93Introduction To Print ReadingRevisionBlockAs changes to a component or system are made, the drawings depicting the component or systemmust be redrafted and reissued. When a drawing is first issued, it is called revision zero, and therevision block is empty. As each revision is made to the drawing, an entry is placed in therevision block. This entry will provide the revision number, a title or summary of the revision,and the date of the revision. The revision number may also appear at the end of the drawingnumber or in its own separate block, as shown in Figure 2, Figure 3. As the component orsystem is modified, and the drawing is updated to reflect the changes, the revision number isincreased by one, and the revision number in the revision block is changed to indicate the newrevision number. For example, if a Revision 2 drawing is modified, the new drawing showingthe latest modifications will have the same drawing number, but its revision level will beincreased to 3. The old Revision 2 drawing will be filed and maintained in the filing system forhistorical purposes.Figure 3 Revision BlockPR-01Rev. 0Page 6
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