MIL-PRF-24755B(SH)
APPENDIX A
TECHNICAL CONTENT FOR ENGINEERING DRAWINGS
A.1 SCOPE
A.1.1 Scope. This appendix covers the technical content requirements that should be included on drawings
when required by the contract or order. This appendix is not a mandatory part of the specification. The information
contained herein is intended for guidance only.
A.2 APPLICABLE DOCUMENTS
A.2.1 General. The documents listed in this section are specified in sections 3 of this appendix. This section
does not include documents cited in other sections of this specification or recommended for additional information
or as examples. While every effort has been made to ensure the completeness of this list, document users are
cautioned that they must meet all specified requirements of documents cited in sections 3 of this appendix, whether
or not they are listed.
A.2.2 Government documents.
A.2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks
form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these
documents are those cited in the solicitation or contract.
DEPARTMENT OF DEFENSE SPECIFICATIONS
MIL-STD-31000
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Technical Data Packages
(Copies of this document are available online at https://assist.daps.dla.mil/quicksearch/ or from the
Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.)
A.2.3 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between
the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this
document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
A.3 DRAWINGS
A.3.1 Drawings. When required by the contract or order, drawings should be identified by the contractor's
identification and document number, and should be in accordance with MIL-STD-31000 for Level 2 drawings.
When required by the contract or order, drawings should contain the following information.
A.3.2 Fan assembly drawing. The fan assembly drawing should include the following:
a. A longitudinal, sectional view of the fans, showing arrangement of component parts which are identified by
piece number flagging. All welds should be indicated by standard weld symbols. The following additional data
should be shown in this view:
(1) Overall (flange face-to-face) fan length and mounting flange outside diameter to the nearest 1/16 inch.
(2) Fan casing inside diameter and wheel (blade) tip diameter to 0.001 inch with tolerance.
(3) Axial distance from the face of the motor mounting flange to the conduit centerline.
(4) Keyway dimensions of the wheel hub and wheel hub to bore diameter 0.0001 inch with tolerance.
(5) Indication of the area of wheel from which metal is to be removed in balancing, and the permissible
depth of such removal.
(6) The nominal axial distance between the trailing edge of a blade at midpoint to the leading edge of a
vane.
(7) Location on the casing of fan and motor identification plates.
b.
An end view of the fan, showing the direction of impeller rotation.
(1) Direction of wheel rotation.
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