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.
A drawing that shows a cutaway portion of an object to reveal its internal construction is called a:
ACS code: AM.I.B
Correct answer: Sectional view
Rationale: A sectional view, or section, shows the part as if it were cut through, exposing interior features that hidden lines alone would make hard to follow. The cut surface is identified with section (cross-hatch) lines. An orthographic view shows external faces straight on, and a perspective view is pictorial, so neither exposes internal structure.
On a sectional view, the surface that has been cut by the cutting plane is identified by:
ACS code: AM.I.B
Correct answer: Section (cross-hatch) lines
Rationale: Section lines, drawn as evenly spaced diagonal cross-hatching, indicate the solid material that the cutting plane passed through; their pattern can also suggest the type of material. Evenly spaced dashes are hidden lines, and long-and-short dashes form a centerline, so neither marks the cut surface.
In the standard orthographic (three-view) drawing arrangement, the top view is normally placed:
ACS code: AM.I.B
Correct answer: Directly above the front view
Rationale: In third-angle orthographic projection used on U.S. aircraft drawings, the front view is the reference, the top view is placed directly above it, and the right-side view is placed to its right, keeping aligned features in line. Placing the top view below or to the left would not match this standard arrangement, so those choices are incorrect.
The total permissible variation of a dimension, that is the difference between its high and low limits of size, is called the
ACS code: AM.I.B
Correct answer: tolerance.
Rationale: Tolerance is defined as the total permissible variation of a dimension — the difference between its maximum and minimum limits of size. Deviation describes the departure of a limit from the basic size, and fit describes the relationship between mating parts, so tolerance is the correct term, per FAA-H-8083-30 aircraft drawings.
A dimension specified as 1 in. +0.002 / −0.001 is an example of what type of tolerance?
ACS code: AM.I.B
Correct answer: Bilateral
Rationale: A tolerance expressed as both a plus and a minus value from the nominal size — here +0.002 and −0.001 — allows variation on both sides of the basic dimension and is therefore bilateral. A unilateral tolerance permits variation in one direction only, with the other limit at the nominal size, per FAA-H-8083-30 aircraft drawings.
On an engineering drawing, a tolerance on a dimension is indicated
ACS code: AM.I.B
Correct answer: by a plus and minus sign preceding the permitted variation values.
Rationale: On an engineering drawing a tolerance is shown by placing plus and minus signs before the permitted variation values applied to the nominal dimension, defining the upper and lower limits of size. There is no standard 'TOL' prefix or triangular tolerance symbol used for this purpose, per FAA-H-8083-30 aircraft drawings.
A blueprint dimension is given as 4.387 inches +0.005 / -0.002. Which statement is true?
ACS code: AM.I.B
Correct answer: The minimum acceptable size is 4.385 inches.
Rationale: The dimension 4.387 inches with a tolerance of +0.005 / -0.002 gives a maximum acceptable size of 4.387 + 0.005 = 4.392 inches and a minimum of 4.387 - 0.002 = 4.385 inches. Therefore 4.385 inches is the smallest acceptable size, and the upper limit is 4.392 inches, not 4.389 inches.
On an aircraft drawing, the tolerance of a dimension is
ACS code: AM.I.B
Correct answer: the allowable variation from a specified dimension.
Rationale: Tolerance is the total permissible variation on a dimension — the allowable amount that workmanship and tooling may deviate while the part remains acceptable. It is the spread between the upper and lower limits of a single feature, not the relationship between a hole and a shaft, which is the fit or allowance.
On an engineering drawing, a visible outline of a part is shown as a
ACS code: AM.I.B
Correct answer: thick continuous line.
Rationale: On engineering drawings a visible outline is drawn as a thick (heavy) continuous line so the part outline stands out clearly. Thinner continuous and dashed lines are used for dimension, extension, projection, and hidden-detail features, not the visible outline. (FAA-H-8083-30, Aircraft Drawings — types of lines.)
Which pictorial drawing shows one face in true elevation, with the depth lines drawn at 30 or 45 degrees to the horizontal?
ACS code: AM.I.B
Correct answer: Oblique projection.
Rationale: An oblique projection draws one face flat-on in true elevation, so that face is shown undistorted, while the depth lines are projected back at a constant angle, typically 30 or 45 degrees, to the horizontal. An isometric drawing uses three equal axes at 30 degrees and shows no true face, and a perspective drawing uses converging lines, so neither matches this description. (FAA-H-8083-30, Aircraft Drawings — pictorial drawings.)
When a design change is incorporated on a drawing, the drawing must be
ACS code: AM.I.B
Correct answer: assigned a new revision number and date.
Rationale: Drawing control requires that any design change raise the revision (issue) number and record the new date, giving full traceability of which configuration is current and which is superseded. Keeping the old revision number would let two different designs share one identity, and making no change at all defeats configuration control entirely. (FAA-H-8083-30, Aircraft Drawings — title blocks and revision control.)
On engineering drawings, drawing numbers are
ACS code: AM.I.B
Correct answer: unique to each drawing.
Rationale: Each drawing carries its own unique drawing number so that any single drawing can be identified and called up without ambiguity. The number is not changed at each revision (the revision number tracks revisions instead), and it is not the same as a part number, since one drawing may define several parts. (FAA-H-8083-30, Aircraft Drawings — drawing numbers and title blocks.)
On a sectional view of a drawing, section (hatching) lines are conventionally drawn at
ACS code: AM.I.B
Correct answer: 45 degrees.
Rationale: Section (cross-hatching) lines are conventionally drawn as thin lines at 45 degrees to the main outline so the cut material is clearly distinguished from the surrounding view. The 30 and 60 degree angles are not the standard hatching angle and are used only to avoid confusion when a feature itself lies at 45 degrees. (FAA-H-8083-30, Aircraft Drawings — sectional views.)
An engineering drawing has a scale shown as 1:4. This indicates that the drawing is
ACS code: AM.I.B
Correct answer: reduced to one-quarter of full size.
Rationale: A scale stated as 1:4 means one unit on the drawing represents four units on the real object, so the drawing is reduced to one-quarter of full size. Full scale would be 1:1, and four times full size would be written 4:1, so those options reverse the meaning of the ratio. (FAA-H-8083-30, Aircraft Drawings — drawing scales.)
On an orthographic projection drawing of an object, how many principal views are theoretically possible?
ACS code: AM.I.B
Correct answer: Six
Rationale: FAA-H-8083-30 explains that orthographic projection can show up to six principal views of an object (front, top, bottom, left side, right side, and rear), though most drawings use only the views necessary to fully describe the part.
Which type of drawing uses standardized graphic symbols to show the electrical connections and functions of a circuit without regard to the physical size or location of the components?
ACS code: AM.I.B
Correct answer: A schematic diagram
Rationale: FAA-H-8083-30 describes a schematic diagram as one that uses symbols to represent components and shows the function and relationship of circuit parts, but does not indicate the actual physical size, shape, or location of the components.
In the title block of an aircraft drawing, what information is provided by the drawing (or dash) number?
ACS code: AM.I.B
Correct answer: It identifies the drawing for filing and reference purposes
Rationale: FAA-H-8083-30 states that the drawing number, located in the title block, is used to identify and control the drawing; it is the number by which the drawing is filed and identified, and dash numbers identify right- and left-hand parts or detail parts shown on the drawing.
What is the primary purpose of an exploded-view drawing?
ACS code: AM.I.B
Correct answer: To show the relationship of parts and how they fit together for assembly or disassembly
Rationale: FAA-H-8083-30 explains that an exploded-view (or detail-assembly) drawing shows the individual parts of an assembly separated but arranged in their relative working positions, which is useful for identifying parts and showing how they fit together during assembly or disassembly.
On a drawing, a centerline is typically drawn as which type of line?
ACS code: AM.I.B
Correct answer: A thin line of alternating long and short dashes
Rationale: FAA-H-8083-30 identifies the centerline as a thin line made up of alternating long and short dashes, used to indicate the center of an object, hole, or symmetrical feature.
On an aircraft drawing, hidden edges or features that cannot be seen in a particular view are represented by what type of line?
ACS code: AM.I.B
Correct answer: Short, evenly spaced dashes
Rationale: FAA-H-8083-30 states that hidden lines are made up of short, evenly spaced dashes and are used to show the edges, surfaces, or features of an object that are not visible in that view.
What does a sectional view (section) on an aircraft drawing show?
ACS code: AM.I.B
Correct answer: The internal construction of a part as if it were cut through
Rationale: FAA-H-8083-30 explains that a sectional view is used to show the internal construction or interior details of a part by depicting it as though it had been cut through along a cutting plane; section (crosshatch) lines indicate the surface that was cut.
When a working drawing is changed after it has been released, how is the change normally recorded on the drawing?
ACS code: AM.I.B
Correct answer: It is entered in the revision block
Rationale: FAA-H-8083-30 explains that changes to a drawing are recorded in the revision block, which lists the revision letter or number, a description of the change, the date, and approval, so that the latest configuration of the drawing can be identified.
What is the primary purpose of the bill of materials on an assembly drawing?
ACS code: AM.I.B
Correct answer: To list the parts, quantities, and materials required to build the assembly
Rationale: FAA-H-8083-30 describes the bill of materials as a list that includes the part numbers, nomenclature, quantity required, and material of the parts shown on the drawing, allowing the technician to identify and order the correct components.
When a dimension on a drawing is followed by the abbreviation 'TYP', what does it indicate?
ACS code: AM.I.B
Correct answer: The dimension is typical and applies to all similar features
Rationale: FAA-H-8083-30 lists common drawing abbreviations and notes that 'TYP' means typical, indicating that a dimension or feature is repeated and applies to all similar features even though it is shown or dimensioned only once.
On a drawing, what is the function of a leader line?
ACS code: AM.I.B
Correct answer: To connect a note or dimension to the feature it refers to
Rationale: FAA-H-8083-30 explains that a leader line is a thin line, usually terminating in an arrowhead, used to connect a note, dimension, or number to a particular feature or area on the drawing.
A drawing that is made to a scale of 1:1 (full scale) means that the object is drawn how?
ACS code: AM.I.B
Correct answer: The same size as the actual object
Rationale: FAA-H-8083-30 explains that the scale of a drawing indicates the ratio of the drawing size to the actual object size; a scale of 1:1 (full scale) means the object is drawn the same size as the actual part.
Which type of pictorial drawing represents an object with all three principal faces inclined equally to the plane of projection, so the lines along the three axes are drawn 120 degrees apart?
ACS code: AM.I.B
Correct answer: Isometric drawing
Rationale: FAA-H-8083-30 describes isometric drawings as a form of pictorial drawing in which the object is positioned so that its three axes make equal angles (120 degrees) with each other, giving a realistic three-dimensional representation.
Phantom lines on a drawing are used to indicate which of the following?
ACS code: AM.I.B
Correct answer: Alternate positions of moving parts or adjacent related parts
Rationale: FAA-H-8083-30 explains that phantom lines, consisting of one long dash alternating with two short dashes, are used to indicate alternate positions of moving parts, adjacent positions of related parts, or repeated detail.
An installation drawing includes what kind of information?
ACS code: AM.I.B
Correct answer: The information needed to install a part in its proper position
Rationale: FAA-H-8083-30 describes an installation drawing as one that includes all the dimensions and information necessary to install a part or assembly in its proper position relative to the rest of the structure or aircraft.
When the abbreviation 'DIA' appears on a drawing, what does it specify?
ACS code: AM.I.B
Correct answer: The diameter of a circular feature
Rationale: FAA-H-8083-30 lists standard drawing abbreviations and notes that 'DIA' stands for diameter, indicating that the associated dimension is the diameter of a circular feature such as a hole or shaft.
What distinguishes a detail drawing from an assembly drawing?
ACS code: AM.I.B
Correct answer: A detail drawing describes a single part; an assembly drawing shows several parts fitted together
Rationale: FAA-H-8083-30 explains that a detail drawing provides the dimensions, material, and other information needed to manufacture a single part, while an assembly drawing shows how several parts fit together to form an assembly.
A diagram that shows the routing and connections of wires and the physical location of electrical components, used as an aid to tracing circuits during maintenance, is best described as which of the following?
ACS code: AM.I.B
Correct answer: A wiring diagram
Rationale: FAA-H-8083-30 distinguishes a wiring diagram, which shows the actual connections and physical arrangement of wires and components for maintenance and troubleshooting, from a schematic, which emphasizes function using symbols without regard to physical layout.