Drafting
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As changes to a component or system are
made, the drawings depicting the component or system must be
redrafted, updated and reissued. When a drawing is first
issued, it is called revision zero or dash (-), 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 the illustration
below. 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.
Organizations will also increment revisions alphabetically,
with first revision being A, the second B and so forth.
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