structures

Question 1

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

Answer 1

jacking points, nose/main LDG

Question 2

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

Answer 2

has less mechanical play

Question 3

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

Answer 3

aluminium

Question 4

A fatigue meter may be activated by

Answer 4

undercarriage weight on wheel-switch during takeoff

Question 5

A fuselage meter station is a

Answer 5

longitudinal point on a/c fuselage

Question 6

What is aircraft rigging?

Answer 6

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

Question 7

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

Answer 7

malleable

Question 8

What is LBL 29.75 on the horizontal tail plane?

Answer 8

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

Question 9

What is a Hi-Lock fastener?

Answer 9

pin held stationery by allen key

Question 10

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

Answer 10

indicates max. grip length

Question 11

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

Answer 11

capillary action

Question 12

Disadvantage of titanium

Answer 12

poor machinability

Question 13

Light used in fluorescent

Answer 13

black

Question 14

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

Answer 14

integral construction

Question 15

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

Answer 15

straight edges and adjustable level

Question 16

Which item is included in the empty weight?

Answer 16

fixed ballast

Question 17

Which material has excellent corrosion resistance?

Answer 17

titanium

Question 18

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

Answer 18

change in temperature

Question 19

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

Answer 19

thermosetting plastic

Question 20

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

Answer 20

center of gravity

Question 21

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

Answer 21

bolt

Question 22

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

Answer 22

fatigue

Question 23

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

Answer 23

butt

Question 24

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

Answer 24

UV light

Question 25

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

Answer 25

Young's Modulus

Question 26

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

Answer 26

rigging

Question 27

MC Clinometer can record angles from zero to ___ degrees.

Answer 27

180

Question 28

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

Answer 28

hot rolling

Question 29

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

Answer 29

honeycomb core

Question 30

Rotor blades spar is made of extruded __________ alloy.

Answer 30

aluminium

Question 31

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

Answer 31

- 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.

Question 32

[SAQ] Principle behind using flashlight to detect cracks.

Answer 32

- 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.

Question 33

[SAQ] Principle behind using flashlight to detect cracks.

Answer 33

- 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.

Question 34

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

Answer 34

- 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. - 2**0**xx: 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