General: Aircraft Drawings 🔊 Flashcards
What type of lines are used in aircraft drawings to indicate hidden views, center lines, and alternate position lines?
A hidden view line is a medium width line made up of short dashes. It represents an edge that cannot be seen when looking at the part from a specific position.
Center lines are thin lines composed of alternating long and short dashes and are used to indicate the center of an object or the center of a void.
Alternate position lines are medium with lines composed of one long and two short evenly spaced dashes. They are used to show the alternate position of a part or the relative position of a missing part.
How are dimension lines shown on aircraft drawings?
Dimension lines are solid and usually broken at midpoint for insertion of measurement indications.
What is a sketch for repair?
It’s a basic drawing that shows specific information and provides minimum detail needed to manufacture a part.
How may an aircraft drawing of a part be drawn to bring out pertinent details?
By drawing a detailed view at a larger scale than the principal view.
Which type of drawing is most helpful in troubleshooting a system?
Schematic
Define tolerance as used in aircraft drawings.
The difference between the plus and minus allowable dimensions of a part
Define clearance as used in aircraft drawings
The dimension given for the space between parts
What is a fuselage station number?
The distance from the datum measured in inches along the longitudinal axis
What information is given in the title block of a blueprint?
The drawing number, the name of the part or assembly, the scale, the date, the name of the firm, the name of the draftsman, the checker, and the approving official
Where is the title block usually found on an aircraft drawing?
The lower right corner
Why are dimensions used and how are they shown on aircraft drawings?
They’re solid narrow lines broken at midpoint for insertion of measurements. They’re used to indicate the size of an object
How can a change to an aircraft drawing be identified?
By its revision letter, usually listed in a table next to the title block or in the corner of the drawing
What is the “bill of materials” associated with aircraft blueprints?
It’s a list of materials and parts necessary for fabrication or assembly of a component or system
Why are symbols used by manufacturers when drawing aircraft blueprints?
They’re a type of shorthand used in drawings to express characteristics of components with minimum amount of drawing or writing
What is orthographic projection?
A way of illustrating an object in a drawing by showing different views at right angles to each other, such as front and side views
