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M6 > 6.11- Electrical Cables and Connectors > Flashcards

6.11- Electrical Cables and Connectors Flashcards

1
Q

What is a wire?

A

An isolated single copper conductor surrounded by insulation.

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2
Q

What is a cable? (Electrical)

A

Group of two or more conductors separately insulated and grouped together by an outer sleeve.

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3
Q

What is a stranded copper conductor normally used for and what are the strands often coated in?

A

Maximum wire flexibility

Tin, nickel or silver.

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4
Q

What are wires with aluminium conductors used for?

A

Large loads like galleys to save weight.

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5
Q

What are the requirements for materials used as insulation?

A 
Voltage resistant up to 600V
Resistant to aircraft fluids
Flexible
Strong
Lightweight
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6
Q

What are the bands of temperature that wire types are categorised into (Normal, high and very high)?

A

100/150°c
250°c
400°c

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7
Q

What are shielded wire types used for?

A

To protect against erratic signals or magnetic interference.

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8
Q

In signal circuits operating below 50KHz how is maximum shielding protection provided?

A

By grounding the shield on one side only, this prevents back-flow of current.

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9
Q

What is different about the grounding of the shield on ARINC 429 data bus?

A

Its grounded at both ends instead of just one.

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10
Q

What is coaxial cable used for?

A

To transport high frequency signals.

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11
Q

Which sides of coaxial cable are grounded for best transmission?

A

Both sides.

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12
Q

For Boeing wire type codes what should you refer to?

A

SWPM 20.

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13
Q

For Airbus wire type codes what should you refer to?

A

ESPM 20.

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14
Q

What does BMS stand for?

A

Boeing Material Specification.

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15
Q

What is BMS 13-28 equal to in MIL spec?

A

MIL-W 7139

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16
Q

What is Boeing Type 1 Wire?

A

Insulated wire with one conductor

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17
Q

What is Boeing Type 2 Wire?

A

Type 1 with shield.

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18
Q

What is Boeing Type 3 Wire?

A

Type 2 with yet another shield.

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19
Q

What is Boeing Class 1 wire?

A

Single insulated wire.

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20
Q

What is Boeing Class 2 wire?

A

Two insulated wires.

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21
Q

How does the Boeing wire size numbering system work?

A

Its a reverse numbering system to represent the current carrying capacity.

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22
Q

All single wires and multi conductors (red wire only) should have what?

A

A manufacturers legend in a contrasting colour at intervals of 100-150mm.

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23
Q

What should the manufacturers legend on a wire include?

A 
Spec
Manufacturer
Country of origin
Year of manufacture
Wire size (AWG)
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24
Q

How can wires be marked?

A

Mechanical printing
Ink-jet
Co2 laser
UV laser.

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25
Q

What are the boeing rules for wire marking?

A 
Must be marked at each end within 10cm.
Biggest marking interval is 72in
Upper case
easily read at 15in
Minimum contrast of 55%
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26
Q

In system wire coding what does the second letter provide?

A

A more detailed description of the system.

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27
Q

What system does the letter coding SA represent?

A

Radio Altimeter.

28
Q

If there is more than one system then how are numbers used before the system code?

A

A number is placed before the letters e.g. 1 SA or 2 SA

Radio altimeter system #1

29
Q

Common use for system wiring is identified using what system?

A

ATA 100.

30
Q

What is a WDM?

A

Wiring diagram manual.

31
Q

How is wire size denoted?

A

Through the use of the American wire gauge (AWG), it is reverse numbered.

32
Q

In the Wire code W104-G-299-22R what do the separate parts represent?

A 
W104- Wire bundle
G- System code
299- Wire no.
22- Wire size
R- Colour code.
33
Q

What is the difference between an even bundle no. and an odd bundle no.?

A

An even no. is electrical system and an odd is an electronic system.

34
Q

In airbus system coding what do the first two and third/fourth digits refer too?

A

First two= ATA Chapter

Third/fourth= ATA sub chapter

35
Q

If the number of wires in which 100% current is flowing is lower, then what will happen to the maximum current flow?

A

It will increase.

36
Q

What is one of the main advantages of aromatic polymide?

A

Saves 50% weight and 30% space.

37
Q

At what temperature does Aromatic polymide smoulder at?

A

815°C

38
Q

What phenomena is known to destroy Aromatic Polymide?

A

Carbon arc tracking.

39
Q

What two categories are there of carbon arc tracking?

A

Dry and wet.

40
Q

What is dry carbon arc tracking?

A

Wire to wire or wire to ground, carbon build up.

41
Q

What is wet carbon arc tracking?

A

Fluid build up instead of carbon in dry arc.

42
Q

What are Exhaust gas temperature cable conductors made from?

A

Chromel and Alumel.

43
Q

What makes the identification of a thermocouple wire different to a standard wire?

A

The colours are different, often white/green.

44
Q

For fire warning wires what is the maximum fire resistance?

A

1093°C for 5 minutes.

45
Q

What must fire warning wire conform too?

A

MIL-W-25038

46
Q

What are electrical connectors used for?

A

To allow maintenance where frequent disconnection is required.

47
Q

What is a more modern and common way of connecting a contact to a connector? Solder or crimping?

A

Crimping.

48
Q

What must be used to terminate aluminium cables?

A

Aluminium or bimetal (AlCu) terminations.

49
Q

Which side of the connector will have a socket instead of the pins?

A

The ‘hot’ side as it avoids the risk of electric shock.

50
Q

What two basic groups of connector are there?

A 
Split shell (disassembled) 
Assembled construction.
51
Q

How are split shell connectors identified?

A

By AN numbers.

52
Q

How many types of AN connector are there in how many classes?

A

Six types in 5 classes.

53
Q

What is a Class A AN connector?

A

General purpose, one piece back shell.

54
Q

What is a Class B AN connector?

A

Back shell is two parts.

55
Q

What is a Class C AN connector?

A

Pressurised connector.

56
Q

What is a Class D AN connector?

A

Moisture and vibration resistant.

57
Q

What is a Class K AN connector?

A

Fireproof connector. Made of steel.

58
Q

What are the most common connector type?

A

Assembled connector.

59
Q

What does an assembled connector consist of?

A

Insert locking mechanism and insulator. The backing clamp is a separate part and has a different part number.

60
Q

For circular connectors, the master keyway is always positioned in which direction?

A

Either top dead or facing forward to the aircraft.

61
Q

How is shell size denoted?

A

1/16 inch, and the letter S is used to denote a short housing.

62
Q

For a plug to be environmentally sealed what must be done with any unused contact holes?

A

Fitted with nylon or tTeflon seal plugs.

63
Q

For crimped contact connectors outside the pressurised area what must be fitted?

A

Unwired contacts in conjunction with seal plugs.

64
Q

Where can you find alternative part numbers and manufacturers?

A

In the standard practices manual.

65
Q

What is a polarisation key?

A

Prevents the wrong computer being inserted into a shelf.

66
Q

What must be done to to non-self locking threaded coupling connectors located in high vibration areas?

A

They must be lockwired.

M6 (14 decks)

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