A detail drawing is a description of a single part, describing bylines, notes, and symbols the specifications for size, shape, material, and methods of manufacture to be used in making the part. Detail drawings are usually rather simple. When single parts are small, several detail drawings may be shown on the same sheet or print. [Figure 4-3]

An assembly drawing is a description of an object made up of two or more parts. [Figure 4-4] It describes the object’s size and shape. Its primary purpose is to show the relationship of the various parts. An assembly drawing is usually more complex than a detail drawing and is often accompanied by detail drawings of various parts.

position in the aircraft. It shows the dimensions necessary for the location of specific parts with relation to the other parts and reference dimensions that are helpful in later work in the shop. [Figure 4-5]

A section or sectional view is obtained by cutting away part of an object to show the shape and construction at the cutting plane. The part or parts cut away are shown by using section (crosshatching) lines. Types of sections are described in the following paragraphs.

A full section view is used when the interior construction or hidden features of an object cannot be shown clearly by exterior views. For example, Figure 4-6 is a sectional view of a cable connector and shows the internal construction of the connector.

In a half section, the cutting plane extends only halfway across the object, leaving the other half of the object as an exterior view. Half sections are used with symmetrical objects to show both the interior and exterior. Figure 4-7 is a half sectional view of a Capstan servo.

A revolved section drawn directly on the exterior view shows the shape of the cross section of a part, such as the spoke of a wheel. An example of a revolved section is shown in often drawn to a larger scale than the view indicated to bring out pertinent details.

Figure 4-9 is an illustration of removed sections. Section A-A shows the cross-sectional shape of the object at cutting plane line A-A. Section B-B shows the cross-sectional shape at cutting plane line B-B. These sectional views are drawn to the same scale as the principal view.

Every print must have some means of identification. This is provided by a title block. [Figure 4-4A] The title block consists of a drawing number and certain other data concerning the drawing and the object it represents. This information is grouped in a prominent place on the print, usually in the lower right-hand corner. Sometimes the title block is in the form of a strip extending almost the entire distance across the bottom of the sheet.

Although title blocks do not follow a standard form as far as layout is concerned, all of them present essentially the following information: