11.2.b Structures General

Question 1

What is a frame or former?

Answer 1

Lateral fuselage giving cross sectional shape

Question 2

How is the strength/weight issue overcome in monocoque structures?

Answer 2

Semi-monocoque using stringers

Question 3

What is a bulkhead?

Answer 3

Gives shape to the fuselage, usually to close off or partition.

Question 4

What is a longeron?

Answer 4

Main lengthwise member, they take the primary bending load.

Question 5

What is a stringer?

Answer 5

Smaller and lighter than a longeron, they serve as stiffeners.

Question 6

What is a doubler?

Answer 6

Additional section of material used to reinforce skin areas.

Question 7

What are some doublers also known as?

Answer 7

Crack stoppers

Question 8

What are struts?

Answer 8

Load bearing components that handle compression forces

Question 9

What is a tie also known as?

Answer 9

Tie rod or tension member.

Question 10

What are floorboards made of?

Answer 10

Honeycomb composite

Question 11

What happens to the floorboards in wet areas?

Answer 11

They are sealed.

Question 12

What methods are there of strengthening aircraft structure?

Answer 12

Butt straps
Cleats
Gussets
Fishplates
Angles

Question 13

What are the two types of fuselage construction?

Answer 13

Truss type
Monocoque type

Question 14

What is a trussed framed fuselage often covered with?

Answer 14

Fabric

Question 15

In a true monocoque construction what is the primary load carrier?

Answer 15

Skin

Question 16

What is a stressed skin structure?

Answer 16

The loads are shared between the skin and frame

Question 17

What methods are there of skinning?

Answer 17

Sheet metal wrapped
Filament wound
Preformed

Question 18

What is the wingbox?

Answer 18

The wing box is designed to provide support and rigidity to the wings and is supported by heavy frames and a “keel beam.”

Question 19

What else does the wing box help with?

Answer 19

Absorb impacts sustained during events like turbulence and it may form part of an integral fuel storage system.

Question 20

How is the engine pylon usually constructed?

Answer 20

Frame and skin

Question 21

What is an advantage of adhesively bonding?

Answer 21

Spreads the loads

Question 22

What is the type of surface protection related to?

Answer 22

Material
Function
Location

Question 23

What are the three groups of protective treatment?

Answer 23

Pre-treatment
Paint
Special coatings

Question 24

What are some of the pre-treatments?

Answer 24

Passivation
Sacrificial coatings
Chemical film
Electroplating

Question 25

What describes the method of cleaning and prep of a surface?

Answer 25

DEF STAN 03-2/1

Question 26

What is chromating?

Answer 26

Process that produces a protective oxide film and has a golden yellow appearance.

Question 27

What is the most common chromate type?

Answer 27

Potassium Dichromate solution

Question 28

Before painting magnesium what must be done?

Answer 28

Special treatment

Question 29

What is the most common type of paint?

Answer 29

Polyurethane

Question 30

What temp must paint be applied in?

Answer 30

15-25 degrees c

Question 31

What is a type 1 special coating?

Answer 31

Water repellent coating generally made from silicone free materials

Question 32

What is a type 2 special coating?

Answer 32

Heavy duty corrosion preventative compound, grease like coating

Question 33

What are the three methods of cleaning an aircraft?

Answer 33

Wet Dry Polishing

Question 34

What does a wet wash remove?

Answer 34

Oil, grease, or carbon and most dirt.

Question 35

When is dry washing applicable?

Answer 35

For removal of aircraft film, dust or small accumulations.

Question 36

What does polishing do?

Answer 36

Restore the brightness/colour.

Question 37

What can chlorinated solvents not be used for?

Answer 37

Interior cleaning.

Question 38

What must happen to thick mud, grease or oil?

Answer 38

Removed by hand.

Question 39

What is necessary after washing?

Answer 39

To re-lubricate.

Question 40

How are exhaust gases cleaned off?

Answer 40

Dilution with water or white spirit and applied with a non-atomising spray.

Question 41

How is snow and ice chemical salts cleaned off?

Answer 41

Clean water

Question 42

What must happen to contaminated plastic foam?

Answer 42

Renewed.

Question 43

What is necessary after the carriage of livestock?

Answer 43

Thorough internal clean, with particular attention to the bilge areas.

Question 44

How is misalignment found?

Answer 44

Performing a symmetry test and alignment check.

Question 45

When must an alignment check be carried out?

Answer 45

Major structural repair Severe conditions Flight crew reports of unusual characteristics.

Question 46

What alignment checks are specified?

Answer 46

Dihedral angle Incidence angle Verticality of the fin Engine alignment Symmetry check Horizontal stab incidence

Question 47

Where is incidence checked?

Answer 47

At least two specified positions

Question 48

If the angle of incidence is correct what will the inclinometer read?

Answer 48

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