INTRODUCTION TO PRINT READING
DOE-HDBK-1016/1-93
Introduction To Print Reading
Revision Block
As changes to a component or system are made, the drawings depicting the component or system
must be redrafted and reissued. When a drawing is first issued, it is called revision zero, and the
revision block is empty. As each revision is made to the drawing, an entry is placed in the
revision 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 drawing
number or in its own separate block, as shown in Figure 2, Figure 3. As the component or
system is modified, and the drawing is updated to reflect the changes, the revision number is
increased by one, and the revision number in the revision block is changed to indicate the new
revision number. For example, if a Revision 2 drawing is modified, the new drawing showing
the latest modifications will have the same drawing number, but its revision level will be
increased to 3. The old Revision 2 drawing will be filed and maintained in the filing system for
historical purposes.
Figure 3 Revision Block
PR-01
Rev. 0
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