How many views are required to represent the important details of most aircraft ?
One, Two, or Three are usually enough
What kinds of parts can be represented by one-view drawings?
Parts with uniform thickness like shims, plates, or gaskets
What is the name for a part of a drawing used to bring out important details and how it is drawn?
A detailed view, usually drawn to a larger scale than the main drawing
What is the purpose of schematic diagrams?
They are primarily used for troubleshooting systems
Describe an orthographic projection
A way of drawing an object using different views at right angles to each other, such as top, front, and side view
Why do manufacturers use symbols on aircraft drawings?
Symbols are a form of shorthand and are used to convey the characteristics of a component with a minimum of drawing
Describe the appearance of lines used to show hidden views, alternate positions, and the middle of symmetrical objects, and give their proper names
Hidden views are shown with hidden lines: short, evenly spaced dashes. Alternate positions are shown with phantom lines: light, alternating long dashes and two short dashes. Center lines are alternating long and short dashes
How can you determine if a drawing has been changed?
A record of changes is listed either in a revision block or in ruled columns which may be in a corner of the drawing or next to the title block
How are dimensions shown on aircraft drawings, what is their purpose?
Dimension lines are solid and broken at the midpoint for inserting measurements, they provide a means to accurately represent the size of an object
What is the difference between "allowance" and "tolerance"
Allowance is the difference between the nominal dimension and the maximum or minimum permissible sizes. Tolerance is the difference between the maximum and minimum extreme permissible dimensions, found by adding the plus and minus allowances.
What is meant by clearance on aircraft drawings?
An allowable dimension between two parts
What kinds of information about an aircraft drawing can be found in the title block?
Part or assembly name, drawing size, scale, date, company name, name or initials of people creating or approving drawing
What info is contained in a bill of materials?
A list of materials and parts needed to fabricate or assemble the component or system shown in the drawing