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Willys Flashing > 11.2 > Flashcards

11.2 Flashcards

1
Q

What defines a primary structure?

A

If damaged or broken it could cause
- loss of control of the aircraft
- catastrophic structural collapse
- harm to occupants
- failure of the power unit
- unintended operation
- incapability to perform a service

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2
Q

What do (PSEs) principle structural elements do?

A

Bear the loads associated with flight

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3
Q

What defines a secondary structure?

A

Any non primary structure which poses intrinsic structural significance

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4
Q

What is tertiary structure?

A

All remaining framework under light stresses

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5
Q

What is a fail safe method?

A

A component which has a “backup” component or shares the load

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6
Q

What is the safe life concept?

A

How long the component can remain safely in service

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7
Q

What are the ATA zones

A

100 - lower fuselage
200 - upper fuselage
300 - empennage
400 - power plant and struts
500 - left wing
600 - right wing
700 - landing gear and their doors
800 - doors

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8
Q

How are sub zero zones denoted?

A

The third digit

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9
Q

How are co ordinates categorised?

A

Body, fuselage, water, and butt lines

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10
Q

How is the body station/ fuselage station shown and measured?

A

Right angle planes measured from a point in front of the nose

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11
Q

How are buttock lines shown and measured?

A

Measured from 0 at the midpoint parallel to the fuselage

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12
Q

How are water lines measured?

A

Right angle to body stations and buttock lines horizontal with the centre being 0

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13
Q

How are wing lines measured/ placed?

A

Measured from butt lines or wing rib one parallel to the fuselage

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14
Q

What is hoop stress?

A

Circumferential tensile stress from pressurisation

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15
Q

What is strain?

A

The ratio of the amount of deformation of a material caused by stress

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16
Q

What is one Damage tolerance concept to minimise damage to large structural components?

A

Multiple path loads which put force through multiple smaller components

17
Q

How is pressure loss prevented on drain holes?

A

Bilge like valves which are open on the ground and closed in the air

18
Q

When is ventilation required?

A

When any vapour can build up

19
Q

What are the fuselage members?

A
  • frame
  • longeron
  • skin
    -stringer
20
Q

What are frames/ formers?

A

Lateral fuselage or nacelle members giving a cross sectional shape often circular

21
Q

What was developed in terms of structure to limit strength to weight ratio issues?

A

Semi monocoque design with stringers etc to transfer weight

22
Q

What are the uses of bulkheads?

A

Give shape to fuselage and close of or partition an area

23
Q

What are longerons?

A

Main longitudinal members they take on primary bending loads supplemented by stringers

24
Q

What are stringers?

A

Smaller and lighter than longerons they stiffen sheet metals mainly used for giving shape they are clipped or cleated in

25
Q

What are doublers?

A

Doubled skin to increase strength found around apertures eg windows and doors

26
Q

What else are doublers made for?

A

Crack stoppers placed at right angles to prevent potential cracks or stop the advance of one

27
Q

What are struts?

A

Load bearing components that primarily handle compression typically transferring force from one part of the fuselage to another

28
Q

What are ties?

A

AKA tie rods/ tension members
Handle tension forces in fuselage often in addition to struts

29
Q

What are beams or floor members constructed of?

A

Honey comb composite

30
Q

How are wings constructed?

A

Spars reinforced with ribs covered with stressed skin

31
Q

What are the types of fuselage construction?

A

Truss, monocoque, semi monocoque

32
Q

How is truss type constructed?

A

Members such as beams, struts and bars often covered with fabric

33
Q

How is monocoque constructed?

A

Skin carries primary stress with formers

34
Q

How is semi monocoque constructed?

A

It is a stressed skin structure reinforced by longitudinal members and formers primarily made with aluminium

35
Q

What is the main advantage of semi monocoque?

A

It can sustain damage and not fail

36
Q

What is the maximum bonding resistance that should be measured on bonding leads?

A

0.025 ohms

37
Q

When grounding how many terminals can there be per stud?

A

No more than 4

38
Q

What must be installed in fuel vapour areas in terms of bonding?

A

Dual grounds

Willys Flashing (24 decks)

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