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structures Flashcards

1
Q

Which of the following can be used for A/C jacking?

A

jacking points, nose/main LDG

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2
Q

Advantage of the cable control system vs the push-pull rod system?

A

has less mechanical play

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3
Q

Not a common type of composite fibers used in aircraft composites.

A

aluminium

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4
Q

A fatigue meter may be activated by

A

undercarriage weight on wheel-switch during takeoff

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5
Q

A fuselage meter station is a

A

longitudinal point on a/c fuselage

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6
Q

What is aircraft rigging?

A

process of assembling and adjusting a system or structure so that the component parts can work together

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7
Q

Metal which is hammered, rolled or pressed into various shape without fracturing is said to be

A

malleable

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8
Q

What is LBL 29.75 on the horizontal tail plane?

A

distance from the fuselage centerline on the LH side of horizontal stabiliser

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9
Q

What is a Hi-Lock fastener?

A

pin held stationery by allen key

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10
Q

Hi-Lock pin part no. HL 18PB-10-4.
What does the number 4 indicate?

A

indicates max. grip length

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11
Q

A developer is applied on the surface of the test material to draw out the penetrant from flaws by…?

A

capillary action

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12
Q

Disadvantage of titanium

A

poor machinability

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13
Q

Light used in fluorescent

A

black

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14
Q

Which skin constructions involves very few structural parts, uses very few joints and rivets, and gives very smooth and rigid structure?

A

integral construction

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15
Q

For a/c rigging check, which equipment is used to measure angle reference line with horizontal surfaces?

A

straight edges and adjustable level

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16
Q

Which item is included in the empty weight?

A

fixed ballast

17
Q

Which material has excellent corrosion resistance?

A

titanium

18
Q

Which of the following is not a possible cause of change in effective length of a control rod?

A

change in temperature

19
Q

Plastic cured by chemical change and cannot be reversed by reheating are known as?

A

thermosetting plastic

20
Q

The weight force of an aircraft mass may be considered to act as a single force through the ___________?

A

center of gravity

21
Q

Jo-bolts are secured in the structure by rotating the ____?

A

bolt

22
Q

__________ occurs when a material is subjected to cyclic loads which varies continuously within limits causing it to fail?

A

fatigue

23
Q

The ____ line is used to locate a position to the left or right from the center of the aircraft structure.

A

butt

24
Q

Florescent dye penetrants employ the use of ________ to make any flaw visible?

A

UV light

25
Q

_____________ measures the resistance of a material to elastic deformation under load.

A

Young’s Modulus

26
Q

Flight control _______ is an adjustment made to achieve the desired output from the corresponding input at an instant.

A

rigging

27
Q

MC Clinometer can record angles from zero to ___ degrees.

A

180

28
Q

The corrosion protection for aluminium is by ___________ a layer of soft aluminium on both surfaces of the sheet.

A

hot rolling

29
Q

The ______________ is between the top sheet and bottom sheet in honeycomb construction.

A

honeycomb core

30
Q

Rotor blades spar is made of extruded __________ alloy.

A

aluminium

31
Q

[SAQ] In a push-pull rod control system, the function of the idler is to do what?

A
  • Idler link connects 2 control rods
  • Control rods are used to transmit motion and from from a control input to control surface.
  • Function is to change direction of motion and force transmission between two control rods
  • Allow control rods to act in parallel with each other.
  • Idler link is designed in such a way that when one rod is pushed or pulled, it rotates and transfers the motion and force to the other control rod in the opposite direction.
  • Ensures both control rods move in same direction & same amount of force.
  • Helps to maintain balance and coordination of control surface.
32
Q

[SAQ] Principle behind using flashlight to detect cracks.

A
  • Shining a flashlight at an angle can help to find damage via the visual inspection NDT method.
  • UV-A blacklights are used in NDT for crack detection during inspection stages of fluorescent magnetic particle and fluorescent penetrant processes.
  • Used at wash stations during removal of fluorescent penetrant.
  • Defects becomes obvious with the use of blacklight due to the clear contrast of defect against dark background.
  • e.g. hairline cracks in LDG.
33
Q

[SAQ] Principle behind using flashlight to detect cracks.

A
  • Shining a flashlight at an angle can help to find damage via the visual inspection NDT method.
  • UV-A blacklights are used in NDT for crack detection during inspection stages of fluorescent magnetic particle and fluorescent penetrant processes.
  • Used at wash stations during removal of fluorescent penetrant.
  • Defects becomes obvious with the use of blacklight due to the clear contrast of defect against dark background.
  • e.g. hairline cracks in LDG.
34
Q

[SAQ] What is the core material in alclad 2024-T4?

A
  • Aluminum alloys are typically numbered with 4 digits and may have a -T suffix with it. In other words, the numbering of the alloy can tell us a lot of information regarding it.
  • 2xxx series: Aluminum alloy with copper as the main alloying element.
  • 20xx: 2nd number 0 original composition of alloy without modifications
  • -T4: Solution heat-treated, naturally aged to a substantially stable condition

Properties
- high strength-to-weight ratio/high strength
- excellent fatigue resistance
- good machinability and surface finish

Uses
- wing, fuselage primary structures that are under tension

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