Appendix 1-Glossary Cont.

Appendix 2- Graphic Symbols for Aircraft Hydraulic and Pneumatic Systems

Blueprint Reading and Sketching - Intro to drafting and architecture practices
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SHEER PLAN—The profile of a ship’s hull, composed of superimposed buttock lines. SHEET STEEL—Flat steel weighing less than 5 pounds per square foot. SHIP’S PLANS—A set of drawings of all significant construction features and equipment of a ship, as needed to operate and maintain the ship. Also called ONBOARD PLANS. SHRINK RULE—A special rule for use by patternmakers. It has an expanded scale, rather than a true scale, to allow for shrinkage of castings. SILL—A horizontal structural member supported by its ends. SINGLE-LINE DIAGRAM—A diagram using single lines and graphic symbols to simplify a complex circuit or system. SOLE PLATE—A horizontal structural member used as a base for studs or columns. SPECIFICATION —A detailed description or identification relating to quality, strength, or similar performance requirement STATION NUMBERS—Designations of reference lines used to indicate linear positions along a component such as an air frame or ship’s hull. STEEL PLATE—Flat steel weighing more than 5 pounds per square foot. STRETCH-OUT LINE—The base or reference line used in making a development. STUD—A light vertical structure member, usually of wood or light structural steel, used as part of a wall and for supporting moderate loads. SYMBOL—Stylized graphical representation of commonly used component parts shown in a drawing. TEMPER—To harden steel by heating and sudden cooling by immersion in oil, water, or other coolant. TEMPLATE—A piece of thin material used as a true-scale guide or as a model for reproducing various shapes. TITLE BLOCK—A blocked area in the lower right corner of the print. Provides information to identify the drawing, its subject matter, origins, scale, and other data. TOLERANCE—The amount that a manufactured part may vary from its specified size. TOP PLATE—A horizontal member at the top of an outer building wall; used to support a rafter. TRACING PAPER—High-grade, white, transparent paper that takes pencil well; used when reproduc- tions are to be made of drawings. Also known as tracing vellum. TRIANGULATION—A technique for making developments of complex sheet metal forms using geometrical constructions to translate dimensions from the drawing to the patten. TRUSS—A complex structural member built of upper and lower members connected by web members. UTILITY PLAN—A floor plan of a structure showing locations of heating, electrical, plumbing and other service system components. VIEW—A drawing of a side or plane of an object as seen from one point. WATERLINE—The outline of a horizontal longi- tudinal section of a ship’s hull. WIRING (CONNECTION) DIAGRAM—A diagram showing the individual connections within a unit and the physical arrangement of the components. ZONE NUMBERS—Numbers and letters on the border of a drawing to provide reference points to aid in indicating or locating specific points on the drawing. AI-5

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