5 - Engineering Drawings

Question 1

What is third angle projection?

Answer 1

Each view represents the side of the object nearest to it in the adjacent view.

Question 2

What does the drawing indicate?

Answer 2

A blind tapped hole.

Question 3

What is the width of a visible outline on a drawing?

Answer 3

0.7 mm.

Question 4

What does the abbreviation GA stand for on a drawing?

Answer 4

General arrangement.

Question 5

By whose approval are design drawings of aircraft components produced?

Answer 5

The CAA in accordance with the BCARs.

Question 6

Which pictorial projection shows one face in true elevation with the depth lines drawn at a constant angle?

Answer 6

Oblique.

Question 7

What must be done if a design amendment is made on a drawing?

Answer 7

A new issue number and date must be allocated to the drawing.

Question 8

What is the British Standard for Engineering Drawings?

Answer 8

BS 308.

Question 9

What does P.C.D. stand for?

Answer 9

Pitch Circle Diameter.

Question 10

How are drawing numbers characterized?

Answer 10

They are unique to each drawing.

Question 11

At what angle are hatching lines usually drawn?

Answer 11

45°.

Question 12

What does a drawing scale of 1:4 indicate?

Answer 12

It is drawn to a quarter.

Question 13

What does an orthographic projection usually show?

Answer 13

Three, two-dimensional views of an object.

Question 14

How should dimension lines be applied in a drawing?

Answer 14

They should be the minimum number necessary to enable the component to be manufactured.

Question 15

What does the abbreviation PFD indicate on an engineering drawing?

Answer 15

Dye penetrant check.

Question 16

What does S.W.G. stand for?

Answer 16

Standard Wire Gauge.

Question 17

If a structure’s classification is unclear, what classification should be adopted?

Answer 17

It should be upgraded to primary.

Question 18

What colour is used to indicate a tertiary structure on a diagram or drawing?

Answer 18

Green.

Question 19

Which parts of the aircraft are classified as secondary structures?

Answer 19

Highly stressed parts but if damaged will not cause failure of the aircraft.

Question 20

What does the abbreviation B.A. mean?

Answer 20

British Association.

Question 21

Where can the correct layout, dimensioning, numbering, and reference procedures for engineering drawings be found?

Answer 21

BS 308.

Question 22

What does a drawing scale of 10:1 indicate?

Answer 22

The drawing is ten times full size.

Question 23

What do short dashed lines (thin) indicate on a drawing?

Answer 23

Hidden detail.

Question 24

What must accompany any change made to a drawing?

Answer 24

The new issue number and date.

Question 25

What is the purpose of break lines in a drawing?

Answer 25

To show where it would be inconvenient (due to limited space) to draw long lengths of the same section.

Question 26

How is an oblique projection defined?

Answer 26

It has one view looking directly at one face with the depth lines drawn at a constant angle.

Question 27

What is an installation drawing?

Answer 27

A drawing that shows subassemblies or parts as brought together on the aircraft.

Question 28

If a thread is labeled “½‑20 UNF – 1B” on a drawing, is it internal or external?

Answer 28

Internal.

Question 29

What does “NTS” stand for on a drawing?

Answer 29

Not To Scale.

Question 30

What information does a hydraulic system schematic drawing provide?

Answer 30

The direction of fluid flow through the system.

Question 31

What is true regarding orthographic projections?

Answer 31

One-view, two-view, and three-view drawings are the most common.

Question 32

What is the term for a line used to show an edge that is not visible?

Answer 32

Hidden line.

Question 33

What is one purpose of schematic diagrams?

Answer 33

To show the functional location of components within a system.

Question 34

What type of line is normally used to represent an edge or object not visible in a mechanical drawing?

Answer 34

Medium-weight dashed line.

Question 35

What is a specific measured distance from a datum (or other identified point) to a point on the aircraft called?

Answer 35

A station number.

Question 36

In a first angle orthographic projection, where is the plan view placed?

Answer 36

Below the front elevation.

Question 37

When a cutting plane cuts a web longitudinally on a drawing, how is the web represented?

Answer 37

It is not sectioned.

Question 38

When a cutting plane goes through a bush and bolt assembly, how are they shown in the sectioned view?

Answer 38

The bush will be hatched but the bolt will not be.

Question 39

What does the letter A.F.D. (in a circle) stamped on a material indicate?

Answer 39

It has been anodic flaw detected.

Question 40

Where is Zone 324 located in ATA 100?

Answer 40

At the tip of the horizontal stabilizer.

Question 41

How is the latest drawing identified?

Answer 41

By its issue number.