Logic diagrams

Illustrator Draftsman 3 & 2 - Volume 2 Standard Practices and Theory
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Electrical/Electronic Drawings, Continued Aircraft electronic prints Electro- mechanical drawings Logic diagrams Aircraft electronic prints include isometric wiring diagrams and block diagrams both simplified and detailed. The purpose and functions of these diagrams are similar to their shipboard counterpart. Aircraft electronic wiring diagrams fall into two basic classes: chassis wiring diagrams and interconnecting diagrams. Electromechanical devices such as synchros, gyros, accelerometers, autotune systems, and analog computing elements are common in avionic systems. You need more than an electrical or electronic drawing to understand these systems; therefore, we use a combination of mechanical drawings and electronic or electrical drawings and call them electromechanical drawings. Electromechanical drawings show only those items essential to the operation of a particular piece of equipment or part. Logic diagrams describe the operation and maintenance of digital computers. Simple logic operations used in digital computers are based on the theory in Boolean algebra that an element can be in only one of two possible states at any given time and that there are three basic operations, AND, OR, and NOT. The two states, represented by 0 and 1 respectively, correspond to the binary number systems consisting of the symbols 0 and 1. Computer operating terms NOR, NAND, INHIBIT, and EXCLUSIVE OR correspond to the basic AND, OR, and NOT. Continued on next page 4-36

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