5 - Engineering Drawings Flashcards
What is third angle projection?
Each view represents the side of the object nearest to it in the adjacent view.
What does the drawing indicate?
A blind tapped hole.
What is the width of a visible outline on a drawing?
0.7 mm.
What does the abbreviation GA stand for on a drawing?
General arrangement.
By whose approval are design drawings of aircraft components produced?
The CAA in accordance with the BCARs.
Which pictorial projection shows one face in true elevation with the depth lines drawn at a constant angle?
Oblique.
What must be done if a design amendment is made on a drawing?
A new issue number and date must be allocated to the drawing.
What is the British Standard for Engineering Drawings?
BS 308.
What does P.C.D. stand for?
Pitch Circle Diameter.
How are drawing numbers characterized?
They are unique to each drawing.
At what angle are hatching lines usually drawn?
45°.
What does a drawing scale of 1:4 indicate?
It is drawn to a quarter.
What does an orthographic projection usually show?
Three, two-dimensional views of an object.
How should dimension lines be applied in a drawing?
They should be the minimum number necessary to enable the component to be manufactured.
What does the abbreviation PFD indicate on an engineering drawing?
Dye penetrant check.
What does S.W.G. stand for?
Standard Wire Gauge.
If a structure’s classification is unclear, what classification should be adopted?
It should be upgraded to primary.
What colour is used to indicate a tertiary structure on a diagram or drawing?
Green.
Which parts of the aircraft are classified as secondary structures?
Highly stressed parts but if damaged will not cause failure of the aircraft.
What does the abbreviation B.A. mean?
British Association.
Where can the correct layout, dimensioning, numbering, and reference procedures for engineering drawings be found?
BS 308.
What does a drawing scale of 10:1 indicate?
The drawing is ten times full size.
What do short dashed lines (thin) indicate on a drawing?
Hidden detail.
What must accompany any change made to a drawing?
The new issue number and date.
What is the purpose of break lines in a drawing?
To show where it would be inconvenient (due to limited space) to draw long lengths of the same section.
How is an oblique projection defined?
It has one view looking directly at one face with the depth lines drawn at a constant angle.
What is an installation drawing?
A drawing that shows subassemblies or parts as brought together on the aircraft.
If a thread is labeled “½‑20 UNF – 1B” on a drawing, is it internal or external?
Internal.
What does “NTS” stand for on a drawing?
Not To Scale.
What information does a hydraulic system schematic drawing provide?
The direction of fluid flow through the system.
What is true regarding orthographic projections?
One-view, two-view, and three-view drawings are the most common.
What is the term for a line used to show an edge that is not visible?
Hidden line.
What is one purpose of schematic diagrams?
To show the functional location of components within a system.
What type of line is normally used to represent an edge or object not visible in a mechanical drawing?
Medium-weight dashed line.
What is a specific measured distance from a datum (or other identified point) to a point on the aircraft called?
A station number.
In a first angle orthographic projection, where is the plan view placed?
Below the front elevation.
When a cutting plane cuts a web longitudinally on a drawing, how is the web represented?
It is not sectioned.
When a cutting plane goes through a bush and bolt assembly, how are they shown in the sectioned view?
The bush will be hatched but the bolt will not be.
What does the letter A.F.D. (in a circle) stamped on a material indicate?
It has been anodic flaw detected.
Where is Zone 324 located in ATA 100?
At the tip of the horizontal stabilizer.
How is the latest drawing identified?
By its issue number.
