Airframe Structures

Question 1

The group of metals with have iron as their principal constituent, is?

Answer 1

Ferrous metals(steel)

Question 2

If ferrous metals contain small quantities of other metals such as nickel, chromium and manganese, as steel alloy is formed such as -

Answer 2

stainless steel

Question 3

The group of metals having elements other than iron as their principal constituent, is?

Answer 3

non ferrous metals

Question 4

where small quantities of other metals have been added to the base metal, an -

Answer 4

alloy is formed

Question 5

Define tension -

Answer 5

the stress that resists the force that tends to pull apart

Question 6

Define compression -

Answer 6

the stress that tends to resist a “crushing” force

Question 7

Define torsion -

Answer 7

The force that produces twisting

Question 8

Define shear -

Answer 8

The stress that resists the force tending to slide one layer of material over another

Question 9

Define bending -

Answer 9

The combination of compression and tension

Question 10

Hoop and axial stress is the result of -

Answer 10

pressurisation within an aircraft

Question 11

considering hoop and axial stress, which one is the radial stress within a tube?

Answer 11

hoop stress

Question 12

considering hoop and axial stress, which one is the longitudinal stress within a tube?

Answer 12

axial stress

Question 13

the three causes of a direct chemical attack -

Answer 13

1. Battery acid
2. Residual flux deposits from welding or brazing
3. Caustic cleaning solutions that have become trapped

Question 14

The cause of electrochemical attack is -

Answer 14

usually water

Question 15

Ribs are used to -

Answer 15

form the wing shape

Question 16

A single shell type structure, where all the flight loads are carried by the outer skin, is a -

Answer 16

Monocoque

Question 17

A stressed skin structure, usually an aluminium alloy, where the outer skin supports some of the load, but is also supported internally by formers and stringers to give both shape and rigidity to the structure, is a?

Answer 17

Semi-monocoque

Question 18

An oscillation affecting the whole wing structure -

Answer 18

torsional flexural flutter

Question 19

An oscillation affecting the wing structure due to the twisting effect on the wing by aileron -

Answer 19

torsional aileron flutter

Question 20

loads imposed on the wing while it is flexing due to the tendency of the aileron to lag behind the up and down movement of the wing as it is flexing. This is called?

Answer 20

Flexural aileron flutter

Question 21

The component that provides the main structural strength in the wing, running laterally, is called a?

Answer 21

Main spar

Question 22

The component that gives the aerofoil its shape, in the wing, is called a?

Answer 22

Rib

Question 23

In the wing Stringers run -

Answer 23

Laterally, or span wise from root to tip.

Question 24

The material that is conductive in order to heat aircraft windscreens, is called?

Answer 24

Stannic oxide

Question 25

An aircraft windscreen normally comprise of how many layers?

Answer 25

3 layers

Question 26

On an aircraft windscreen, the material that separates the tempered class and the stannic oxide is?

Answer 26

A sheet of transparent vinyl

Question 27

With an aircraft windscreen, what is included to prevent shatter?

Answer 27

A sheet of transparent vinyl

Question 28

The layer that provides the most strength in a windscreen?

Answer 28

The centre layer

Question 29

A centilever wing is one that requires -

Answer 29

no external bracing via struts

Question 30

Bending loads imposed on the fuselage are supported by -

Answer 30

longerons

Question 31

Bending loads on the wings are supported by -

Answer 31

frames, formers and stingers,

Question 32

Ribs are assisted in supporting torsional loads by internal -

Answer 32

struts

Question 33

The primary force is weight, acting vertically from the centre of gravity. On the ground, with the total mass of the aeroplane supported by its undercarriage, this causes -

Answer 33

tension on the upper surface of the wings and compression on the lower surface.

Question 34

During flight, lift tends to pull the wings up, resulting in -

Answer 34

compression on the upper surface and tension on the lower surface

Question 35

Stringers run longitudinally and serve to locate the frames and formers as well as provide -

Answer 35

support for the skin, preventing buckling and bending.