09-08-2012, 11:53 AM
ENGINEERING DRAWING STANDARDS MANUAL
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INTRODUCTION
This drawing standards manual establishes the conventions to be adhered to by
engineering and drafting personnel in the preparation, revision, and completion of
engineering drawings. This manual sets forth the minimum requirements acceptable at
GSFC for the preparation of engineering drawings for flight hardware and ground
support systems. The requirements specified herein are essential to the standardization
of practices and to a uniform interpretation of drawings.
A system, payload, or component assembly shall be completely defined by means of
drawings, including lists, schematics, wiring diagrams, and specifications, to ensure that
components fabricated are in accordance with the design. The documentation
information shall serve as a permanent record.
Flight hardware shall be fabricated in accordance with the approved design documents.
These documents shall reflect the characteristics and acceptance criteria for all
materials, component/parts, subsystems, and the complete system. The acceptance
criteria for parts and materials shall be specified by standard specifications when
applicable.
Engineering drawings are defined as those drawings that communicate the requirements
for the manufacture of the end-product items, their assembly, and their installation in the
end product.
Zoning
Vertical and horizontal zoning may be used if necessary to provide orientation to
the field of drawings. Zoning is mandatory for multisheet drawings “D” size and
larger and single-sheet drawings “E” size and larger. Zones shall be identified by
alphabetical (uppercase) and numerical entries in the margin spaces as indicated
in Figure 1. Zone sizes shall be 8½ inches (width) by 11 inches (length) for “E”
and “J” size, 7 inches (width) by 10 inches (length) for “F” size, and 5½ inches
(width) by 8½ inches (length) for “D” size.
Title Block and Revision Block
Title blocks and revision blocks shall be prepared and completed as follows:
The Title block of single-sheet drawings, first sheets of multisheet drawings, and
revision blocks shall appear as shown in either Figure 2a on page 5 (dimensional
system/inches) or Figure 2b on page 6 (dimensional system/millimeters). The
information required in the Title block shall be as specified or referenced by
items 1 through 28, below. The Title block of continuation sheets for multisheet
drawings shall contain information listed in items 1, 2, and 4 through 11.
DRAFTING PRACTICES
General
These drafting practices are to be employed in the preparation of drawings by
GSFC personnel to achieve commonality throughout and result in legible
reproductions at the least cost from original drawings.
Drawings must be complete and unambiguous in interpretation. Complete
drawings contain or make reference to all data necessary for fabricating and
installing the part and, when applicable, the necessary test requirements,
procurement requirements, and source.
Third-angle orthographic projection shall be used for mechanical engineering
drawings. (Certain diagrams, schematics, etc., are excepted.) Although other
types of projection, such as isometric, perspective, etc., are not prohibited, their
use must be confined to an auxiliary view on a drawing of a complex part when
such a view shall aid in visualizing the part.