Chapter 5B

How are circular Part Dimensions marked?

"D" or the Abbreviation "DIA."

If a drawing is full-scale, typically there are some details that are drawn to another scale. (True or False)

(True)

What is the different types of lines used in drawings?

-Visible Lines -Hidden Lines -Center Lines -Extension Lines

If a dimension is given with a decimal the tolerance is _____

0.1 inch

In aircraft drawings, any dimension given as a common fraction normally assumes a dimensional tolerance of plus or minus _____

1/64 Inch

Bill of Materials

A document that shows the quantity of each type of direct material required to make a product. Quantity, part number, description, size, and specification number.

What is a Zone in a aircraft drawing?

A grid to show where placement of parts are on an aircraft drawing.

What is a dimension line?

A light line with arrows on the ends used to contain the numerical value.

What is a Hidden Line?

A line type that represents an edge that is not directly visible. Consists of a dashed line of Medium-Weight.

What is a Center Line?

A line which defines the center of arcs, circles, or symmetrical parts. Made up of alternating long and short dashes.

Short-Break Line

A medium weight line that are used across all dimensions to show that a part continues.

What is the Responsibility in a title block?

A place where people put their initials who have worked on different aspects of the aircraft.

What is a Visible Line?

A visible line is a line used to illustrate a visible part. A Medium-Weight Solid Line and is the most common type of line.

What is the different sizes of drawings and their letters?

A- 81/2 x 11 Inches B-11 X 17 Inches C- 17 x 22 Inches D- 22 X 34 Inches R- 36 to 42 Inches

Where is the revision block normally located ?

Adjacent to the title block or at top RH corner.

The difference between the normal dimension and the upper or lower limit is called the ________

Allowance. It represents the tightest permissible fit for proper construction.

Phantom Lines

Are light lines made of alternating long dashes and two short dashes. These lines indicate the presence of another part or to indicate a parts alternate position.

Distances to the right or left of the fuselage center-line is called the ________ _________

Buttock Lines

If a drawing does not include any parts that are drawn to scale, which word is used? A)NO B)NO SCALE C)NONE D) FULL EXCEPT AS NOTED

C

Cutting Plane Line

Consists of medium or heavy alternating lone dashes and two short dashes with an arrowhead at each end. Used to show where a sectional view is taken.

Scale indicates the size of the _______

Drawing

Every aircraft factory has it's own _________ _________

Drawing room

The symbol for Steel is frequently used to represent all metals. (True or False)

False. Cast Iron

Extension lines touch the visible lines of an object. (True or False)

False. They are 1/16 of an inch from a parts edge.

Fractions are always made with a horizontal division line and numerals should be twice as high as whole numbers. (True or false)

False. Two Thirds as high

The location of a part is typically specified by ___________ ___________ _________ , _________ ___________ and __________ ____________

Fuselage station numbers, water lines, and buttock lines.

What is a title block?

Generally printed in the lower right hand corner of every drawing. It contains the info necessary to manufacture the illustrated part. If additional info is needed it it listed to the left of the block.

What is a Drawing Number?

If an aircraft has a left hand and right part, they typically have the same part number. Left is followed by -1 and right is followed by -2

What is a Revision Block?

Indicates the date and description of the revision as well as the persons initials.

What is the application block used for?

Indicates where the part is used

What is a normal dimension?

It is a dimension that appears on a drawing for the perfect size.

How is a Dimension of an Arc marked?

It's marked in terms of it's radius, so "R"

Long-Break Line

Light line used across a large part that includes a series of breaks or zigzags. Long break lines extend beyond the edges of a part.

Leader Lines

Light lines with arrowheads that extend a note, number, or info box to a part. Leader lines never cross dimension lines, extension lines, or another leader line.

The Horizontal marks on a zone grid are identified by _______

Numbers.

Where is the Datum typically located?

On the fuselage or ahead of it

Holes are typically located within reference to _________ _________ ___ __ ______

One corner of a part

Most sketches made for aircraft drawing is either ___________ or ____________

Orthographic or isometric

What is another name for station zero

The Datum

What is a fuselage station number?

The distance in inches from the datum, measured along the longitudinal axis of the fuselage.

What is the tolerance of .281 +- .0005?

The extreme permissible dimensions are .2805 and .2815. Therefore the tolerance is .0010 inches

What is a Title box?

The part name is put in the box labeled "Title". The subject is usually listed first.

All lettering is done freehand in an aircraft drawing. (True or False)

True

Section Lines

Used to show differences in types of materials or exposed surfaces.

What is the name for the zero reference of a water line?

Water Line Zero

How are vertical locations on an aircraft identified?

Water lines

Standards

Where the manufacturer specifies the linear and angluar tolerances along with the standard for surface roughness.

What is a wing station?

Wing stations are measured from the center-line of the fuselage, or buttock line zero.

What is a perpendicular bisector?

a segment, ray, line, or plane that is perpendicular to a segment at its midpoint

What is an Extension Line?

shows where a dimension starts and ends