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M7 > Essay Topics > Flashcards

Essay Topics Flashcards

1
Q

What is the problem with a ‘dry joint’ when soldering?

A

They are fragile and have a high resistance

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2
Q

When arranging the contacts for soldering, in what direction should they be placed in the solder bucket?

A

Facing upwards

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3
Q

What should not be present on the outside of a soldering bucket?

A

Excess solder

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4
Q

If, when soldering, the strands aren’t held in position, what can be created?

A

A dry joint

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5
Q

What are the four types of self-fluxing solder?

A

Single-core
Tri-core
Perforated-core
Multi-core

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6
Q

What is soft (tin-lead alloy) solder recommended for?

A

It is the recommended solder for electrical and electronic applications.

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7
Q

What is the purpose of using a flux?

A

It removes the oxide from the surfaces to be soldered and promotes a good flow of solder in the joint.

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8
Q

What is conducive to a good soldering result?

A

A well equipped soldering station

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9
Q

What is bonding?

A

It is the electrical interconnection of metallic parts (normally at earth potential) for the safe distribution of electrical charges and currents.

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10
Q

How is the aircrafts earthing system automatically connected to the ground upon landing?

A

Via the noise wheel tyre (impregnated with an electrically conductive compound)

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11
Q

What are braided copper or aluminium cords fitted with lugs used for when bonding?

A

Bonding connections between moving parts or parts subjected to vibration

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12
Q

What should all bonding connections ensure?

A

They should be properly locked to prevent intermittent contact which may be caused by vibration.
(Intermittent contact is worse than no contact at all)

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13
Q

When installing bonding connections, what must be considered?

A

Surrounding/adjacent equipment as they must not interfere.

They should also not be excessively tight or slack

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14
Q

Before installing bonding connections to insulating materials, what must be done?

A

Anodic finishes and/or paint is removed from contacting faces.

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15
Q

What are the checks completed before carrying out bond testing?

A
  • a full scale deflection of the meter is obtained when the two spikes of the 6-foot cable are shorted.
  • the meter reads zero when the single spike 60-foot probe is connected
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16
Q

What is the process of solid rivet removal?

A

Step 1 = File Flat
Step 2 = Centre punch
Step 3 = Drill through the head
Step 4 = Insert drift punch to break off the head
Step 5 = Drive out the river shank whilst supporting the back (bucking bar)

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17
Q

What safety precautions are carried out prior to solid rivet removal?

A
  • Eye protection
  • Check what is behind the rivet
  • Warn people in the vicinity
  • Prevent FOD as far as possible
  • Cleaning work area
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18
Q

When lifting as an individual, what is the maximum load that can be lifted?

A

20kg

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19
Q

Even light loads when individually lifting can cause what type of problem?

A

It can obscure your vision

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20
Q

What can be damaged if the loads are incorrectly lifted?

A

The lumbar disks (slipped disks)

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21
Q

What is the correct way to lift a load individually?

A
  • Take a balanced squatting position.
  • Legs should be at hip width apart with one foot slightly ahead.
  • Load should be held close to the body (head up, chin drawn in to keep the back straight and rigid)
  • The load should be raised by thigh muscles and bones. The bone structure should support the load.
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22
Q

When team lifting, who is responsible for the safe completion of the task?

A

The team leader

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23
Q

What are the things that the team leader should ensure prior to the team lift?

A
  • everyone should understand what the job involved
  • path is clear of obstructions
  • each member is a similar height and physique
  • the weight of the load is evenly distributed
  • that he/she has the best all-round view of the area
  • all moved equipment is put back to the original position after the move
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24
Q

What does COSHH stand for?

A

Control of Substances Hazardous to Health

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25
Q

What safety concerns do oils and chemicals present?

A
  • inflammable
  • noxious fumes
  • presents slip hazards
  • cause skin diseases (dermatitis)
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26
Q

What is POL?

A

Petrols, oils and lubricants.

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27
Q

Who is responsible to produce the MSDS?

A

The manufacturers responsibility

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28
Q

The COSHH law requires employers to control substances in the workplace. How can they prevent or reduce workers’ exposure to it?

A
  • Health hazards & Risk assessments
  • Control measures (in good working order)
  • Providing training, information and instruction
  • Planning for emergencies
  • Minimise possibilities of combustion
  • Minimise effects of fumes
  • Clean up or contain spillages promptly
  • Prevent contamination of dermatitis
29
Q

What is the main advantage of using cascade charging?

A

Avoid wastage of gases

30
Q

What are used for the initial charge when cascade charging?

A

The partially exhausted ones first

31
Q

What is the advantage of a cascade manifold?

A

It automatically fills from the lowest source and the auto cascade switches to the next bottle.

32
Q

What should oxygen be avoided coming into contact with?

A

Oils and greases because it can spontaneously combust without the application of heat

33
Q

What should be avoided immediately after working with oxygen?

A

Smoking as the oxygen can be absorbed into the clothing and the naked flame could ignite the clothing.

34
Q

What type of tools should be used when working with oxygen?

A

Only correct tooling as normal tooling can cause sparks and should not be used.

35
Q

Before working with oxygen on an aircraft, what should be done prior?

A

The aircraft should be correctly bonded and grounded

36
Q

What can be used for leak tests on oxygen systems?

A

Prescribed oil-free solutions

Not soapy water

37
Q

What should be done before charging breathing oxygen systems on aircraft?

A

The oxygen should be smelled to ensure it’s not contaminated.

38
Q

When checking the soldering, what should be looked for as far as possible?

A

Solder has flowed between the conductor strands

39
Q

What must undesignated wires be dead ended with?

A

Caps or sleeves

40
Q

How far must dead ending be accomplished from connectors?

A

Within 4-6 inches

41
Q

After isolation, where should dead ended wires be stowed?

A

Visible outside of the bundle, wrapped, tied and stowed near unused terminations.

42
Q

What should be used to fasten re-insulated circuit breaker terminal insulation?

A

Waxed string or plastic ties

43
Q

What is the minimum fold-back amount of a flexible sleeve of a dead ended wire?

A

1 inch

44
Q

What is the minimum amount of shrinkable sleeve that is pinched with pliers?

A

1/4 inch or 5mm

45
Q

What is the preferred method when a coaxial cable is damaged?

A

Replacement

46
Q

If a repair of a coaxial cable is absolutely necessary, what must be used?

A

Coaxial plug and receptor

47
Q

Where is a coaxial repair not permitted?

A
  • low range altimeter
  • glide slope
  • a coaxial cable with a previous repair
48
Q

Where must splices not be installed?

A
  • inside metal or flexible tubing
  • within 12 inches of termination devices
  • under clamps
  • inside fuel tanks
  • in wire harnesses that are frequently bent
49
Q

How must splices be presented in a wire bundle?

A

Staggered

50
Q

What is the maximum number of splices allowed in a wire?

A

3

51
Q

What is the preferred option for a damaged wire?

A

Replacement

52
Q

Outside the pressurised areas of an aircraft what type of tape is used?

A

Aircraft fluid resistance tape

53
Q

In high temperature areas what grade of insulation tape is required?

A

Grade D

54
Q

How is chafed or broken insulation repaired?

A

Splicing

55
Q

If a wire has been subjected to heat damage, what may be necessary to prevent it reoccurring?

A

Changing the wire routing

56
Q

When repairing a shielded cable what must the repair ensure?

A

It is fully closed and electrically continuous

57
Q

Where are splices considered a temporary repair and must be replaced at the next maintenance check?

A

Engine harness wires or fire warning wires

58
Q

What is the most common method for attaching a shield ground wire to a shielded cable?

A

A solder sleeve pigtail

59
Q

What is the method of installing a solder sleeve pigtail?

A
  • Strip the wire to the correct dimensions
  • One end of the sleeve is slightly wider to accommodate for the the ground wire
  • Heat shrink gun is used to shrink the sleeve into position and enable solder the run
  • Creates an electrical connection between the ground wire and the cable shield
60
Q

What is acceptable when inspecting a solder sleeve pigtail?

A

Dark areas or slight discolouration provided solder can be inspected and the sleeve is not ruptured or split

61
Q

What must be ensured when inspecting a solder sleeve pigtail?

A

The seal rings have melted providing an environmental seal

62
Q

What is a continuity consisting of?

A

A low voltage battery 2.5V and a test lamp or low-reading voltmeter

63
Q

What must be done prior to a continuity test?

A

The main electrical supply should be switched off or disconnected

64
Q

When testing a circuit, how should it be worked through?

A

Progressively through the circuit starting from relevant fuses or circuit breakers

65
Q

When is a millivolt drop test carried out?

A

When a loose terminal connection or poorly swaged end is suspected. There is a excessive amount of resistance.

66
Q

If testing a continuously-rated circuit with a millivolt drop test what should the test current be?

A

The normal operating current flowing

67
Q

For short-rated circuits what is used as a test current instead of the normal electric load?

A

A suitable resistance or dummy load. The current should be scaled down to avoid overheating

68
Q

What is the approximate guide of current and amps flowing for the millivolt drop test?

A

5mV or 10amps

M7 (17 decks)

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