On an aircraft drawing, what is the purpose of the title block?
ACS code: AM.I.B
Correct answer: To identify the drawing by number, name, scale, and date
Rationale: The title block is normally located in the lower right corner of a drawing and contains the drawing number, the name of the part or assembly, the scale, the drafting date, and the name of the firm. It identifies the drawing so it can be filed and retrieved. The list of changes belongs in the revision block, and parts are listed in the bill of materials, not the title block.
A drawing prepared by passing light through a tracing onto sensitized paper, producing white lines on a blue background, is called a:
ACS code: AM.I.B
Correct answer: Blueprint
Rationale: The term blueprint comes from the original reproduction process that produced white lines on a blue background. The handbook notes that although modern copies are often black-on-white, the term blueprint is still used for working drawings. A schematic shows function rather than physical form, and a pictorial gives a three-dimensional view, so neither describes the reproduction process.
On an aircraft drawing, a hidden line (a line that is out of view) is represented by a:
ACS code: AM.I.B
Correct answer: Series of short dashes
Rationale: Hidden lines represent edges and surfaces that are not visible from the viewing direction and are drawn as a series of short evenly spaced dashes. A heavy solid line is a visible (object) line, and a line of alternating long dashes and dots is a centerline. Recognizing line conventions is essential to reading a drawing correctly.
A centerline on an aircraft drawing is drawn as a:
ACS code: AM.I.B
Correct answer: Line of alternating long and short dashes
Rationale: A centerline indicates the center of a symmetrical object or hole and is drawn as alternating long and short dashes. Evenly spaced short dashes form a hidden line, and a thin continuous line is typically a dimension or extension line. Correct identification of line types prevents misreading the geometry of a part.
When a drawing is labeled "SCALE 1:1," the object shown is drawn:
ACS code: AM.I.B
Correct answer: The same size as the actual part
Rationale: A scale of 1:1 means the drawing is the same size as the actual object. A reduced scale such as 1:2 would show the part at half size, and an enlarged scale such as 2:1 would show it at twice size. The mechanic should still take dimensions from the figures given, never by measuring the drawing.
Which drawing uses symbols and lines to show the function and sequence of an electrical or fluid system without depicting actual part shapes?
ACS code: AM.I.B
Correct answer: Schematic diagram
Rationale: A schematic diagram uses standardized symbols to show how a system functions and how components are connected, without regard to their physical size, shape, or location. It is widely used for electrical and hydraulic systems. A detail drawing depicts a single part's actual form, and a sectional view shows internal structure, so neither emphasizes system function.
The area of a drawing that records all changes made to the drawing after its original release is the:
ACS code: AM.I.B
Correct answer: Revision block
Rationale: The revision block, usually in the upper right corner, lists each change to the drawing along with a revision letter or number and date. This lets the user confirm the drawing is current. The title block identifies the drawing, and the bill of materials lists the parts and quantities, so neither tracks changes.