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M11 > 11.2 B Airframe Structures > Flashcards

11.2 B Airframe Structures Flashcards

1
Q

Define longeron

A

Main longitudinal member of fuselage or nacelle

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2
Q

What’s the name given for a member that takes a tensile load?

A

Tie road
(Tension rod)

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3
Q

What load does a strut take?

A

Compression load

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4
Q

In a semi-monocoque stressed skin, what are the loads shared between?

A

Skin and framework

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5
Q

What is the purpose of the aircraft frame?

A

Gives cross- sectional shape, often circular

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6
Q

Maintains the contour of the covering, can be a stress bearing component, what is it?

A

Rib

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7
Q

Describe a spar

A

The main spa wise member of an aerofoil

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8
Q

What member assist sheet material in carrying loads along their length?

A

Stringer

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9
Q

What is a bulkhead?

A

A partition within the structure

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10
Q

What is a pressure bulkhead?

A

Forms the boundary of a pressurised structure

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11
Q

How do you know where certain components like frames and ribs are positioned?

A

Station numbers

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12
Q

Explain safe life

A

The period in which a component is extremely unlikely to fail

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13
Q

What is the purpose of using a crack stopper?

A

Placed at right angles to the crack, which reduces the rate of further cracking

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14
Q

What is the difference between aerodynamic and static loading?

A

Aerodynamic = when in flight
Static = when stationary

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15
Q

What are the two types of fuselage construction?

A

. Monocoque
. Truss

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16
Q

How does the truss type work?

A

Made of members like beams, struts etc then covered in fabric

17
Q

What are the two sections of a monocoque classification?

A

. True monocoque
. Semi - monocoque

18
Q

What are the main memebersin a true monocoque construction?

A

. Formers, frame, bulkheads and skin

19
Q

What takes the primary stress in a true monocoque construction?

A

Skin

20
Q

How is a semi- monocoque differ from a true- monocoque construction?

A

The skin is reinforced by longitudinal members, therefore both take the loads

21
Q

What is the main advantage of a semi- monocoque structure?

A

Can withstand considerable damage and still be strong

22
Q

What construction are floor boards?

A

Honeycomb composite construction

23
Q

Floorboards have a foam tape on the underside where they contacts structure, what about in wet areas?

A

The edges are sealed up

24
Q

How are the two wings attached to each others?

A

By the wing box

25
Q

What is the wing box designed to do?

A

Provides support and rigidity to the wings

26
Q

How is the horizontal stabiliser attached to the fuselage

A

Box section

27
Q

How is the vertical stabiliser attached to the rear stabiliser?

A

By large machined fittings

28
Q

The engine pylon is made of a frame and skin but how is it formed to make nacelle and strut?

A

Riveted and bonded together

29
Q

What is the purpose of nacelles?

A

They are streamlined enclosures used to house engine and it’s components

30
Q

Due to weight what is the preferred rivet type to join metal parts together?

A

Solid shank rivets

31
Q

When would you use a blind rivet?

A

When access to joint is only available from one side

32
Q

What marking do close tolerance bolt have on its head?

A

A raised or recessed triangle

33
Q

What would you do if a bolt had no head markings?

A

Do NOT Use as probably a commercial grade bolt

34
Q

What is the most effective assembly method?

A

Adhesive bonding
(Foam cores can also be used)

35
Q

What are the three types of surface protection?

A
  1. Pretreatment
  2. Paint coatings
  3. Special coating
36
Q

What 2 sections can paint coatings be subdivided into?

A
  1. Primers
  2. Top coat
37
Q

For special coatings what is type 1 and type 2?

A

Type 1- water repellent (silicone free)
Type 2- heavy duty corrosion preventative

38
Q

What are the two conditions for water used to clean an aircraft?

A

. Water between 7 and 8 PH
. Chloride level less than 100ppm

39
Q

For an aircraft symmetry check what equipment would you use for small aircraft vs large aircraft?

A

Small aircraft = steel tale
Large aircraft = check the floor

M11 (41 decks)

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