7.5 Engineering Drawings Practice Flashcards

A comprehensive set of vocabulary flashcards covering engineering drawing types, standards, projection methods, symbology, and ATA specifications based on the lecture notes.

Engineering drawings

The language of engineers used to convey the designer’s requirements for manufacture, assembly, production planning, testing, and inspection.

BS8888

The British standard for drawings which is equivalent to the European standard.

ISO

International Organization for Standardization, one of the world's largest developers of voluntary global standards.

Working drawing

The most common type of drawing in use, which includes detail, assembly, and installation drawings.

Detail drawing

A drawing that supplies all information required to construct a part, including dimensions, materials, and type of finish; sometimes called FAB drawings.

Inseparable assembly

Describes items or parts separately fabricated and permanently joined, such as welded or riveted parts not subject to disassembly.

Installation drawings

Drawings that bring sub-assemblies together and describe the position where parts are permanently fixed within the aircraft or vehicle structure.

Phantom lines

Lines composed of one long and two short evenly spaced dashes used to locate parts not involved in an installation or for reference.

Assembly drawing

A drawing of a multiple-piece item that can be disassembled without being destroyed, depicting the relationship between two or more parts.

Double balloons

Symbols used on drawings to signify an assembly of parts, whereas single balloons signify a singular part.

Revolved section drawing

A drawing showing a cutting plane perpendicular through a feature, rotated $90^\circ$ and drawn directly on the adjacent view.

Removed section

A sectional drawing drawn adjacent to the view rather than on it, used when space is limited or to avoid clutter.

Half-sectional view

A drawing showing both the inside and outside of a part, typically with the upper half showing internal construction and the lower half showing the exterior.

Exploded view drawings

Illustrations where all parts are shown in their relative positions but expanded outwards so each can be identified by appearance or name.

Block diagram

A troubleshooting aid representing components as individual blocks; it does not show every wire and switch in detail.

Troubleshooting flowcharts

Charts used for the detection of faulty components, often consisting of a series of "yes" or "no" questions.

Logic flowcharts

Diagrams developed for analyzing digitally controlled components using standardized symbols for logic gates and binary mathematics ($1s$ and $0s$).

Schematic drawings

Functional drawings that illustrate a principle of operation and the direction of fluid or electrical flow rather than an exact image or scale.

Orthographic projection

A method representing a three-dimensional object using several two-dimensional views, usually featuring six possible views (front, rear, top, bottom, left, and right).

First angle projection

A projection method of European origin where each view represents the side of the object that is remote from it in the adjacent view.

Third angle projection

A projection method of American origin where each view represents the side of the object that is nearest to it in the adjacent view.

Isometric view

A three-dimensional view where the object is tilted so three views are visible and all edges form a $30^\circ$ angle to the drawing plane.

Oblique drawing

A drawing where one face is parallel to the drawing plane and the depth axis is typically at a $45^\circ$ angle.

Tolerance

The sum of the plus and minus allowance figures indicating the total allowable variation in a dimension.

Revision block

A section located in the upper-right hand corner of a drawing that records amendments, including a letter, description, date, and approval initials.

Zones

A grid system on large drawings using letters and numbers to indicate coordinates for locating specific information like the Revision Block.

Raising-in-issue

The process of increasing the drawing issue by one digit (e.g., from Issue 1 to Issue 2) when an amendment is recorded.

Bill of materials

A list in ruled columns providing part numbers, names, materials, and quantities required for fabrication or assembly.

Centre lines

Lines made of alternate long and short dashes used to indicate the centre of an object or short dashes intersecting symmetrically for circular paths.

Finish marks

Marks used to indicate surfaces that must be machine finished to allow for a closer fit or better appearance.

Surface texture

A measure of smoothness where the smaller the number, the smoother the finish, normally measured in micrometers ($\mu m$).

Counterbore

A larger diameter hole concentric to a primary hole with a flat shoulder to accommodate fastener heads for flush fitting.

Spotface

A shallow counterbore providing a flat seating for a mating part, fastener head, or nut, typically used on rough castings.

CATIA

Computer Aided Three Dimensional Interactive Application; software used by most airframe manufacturers to design and assemble aircraft.

Microfiche

An analog storage system where pages are laid out in a grid format on a card, requiring special devices for reading and printing.

ATA Specification 100

A standardized numerical format for aircraft maintenance information, using standardized numbered chapters to organize technical data.

iSpec 2200

The combined document of ATA Spec 100 and ATA Spec 2100, representing the latest organizational standard for maintenance data.

Page block 801 – 899

The specific range of page numbers in an aircraft maintenance manual reserved for repair information.

AN

Air Force/Navy system; one of the most widely used hardware standards in aviation developed by the U.S. military.

Line Replacement Unit (LRU)

A component or module that can be replaced as a whole, identified in system schematics to enable fault isolation.

Standard Wiring Practices Manual (SWPM)

A source document (specifically for Boeing) containing data and tables for carrying out repairs for connectors and wiring.

Home diagram

A diagram assigned to any wire termination used for three or more wires shown on three or more wiring diagrams, indicating all connections on that termination.