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Kemble > 7.7 Electrical Wiring Interconnection System (EWIS) > Flashcards

7.7 Electrical Wiring Interconnection System (EWIS) Flashcards

1
Q

What 3 things should installation of wires conform to

A

1st is safety
2nd is ease of maintenance
3rd is cost effectiveness

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2
Q

Where must plastic ties not be used

A

In unpressurised areas

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3
Q

What minimum distance must be maintained with wire bundles from pipes carrying flammable liquids?
What distance from pipes that are not carrying anything harmful?

A

50mm from harmful
15mm from not harmful

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4
Q

What’s the minimum bend radius for single wires and what’s the preferred bend radius

A

Minimum is 3 times the outside diameter of the wire and the preferred is 10 times the outside diameter of the wire

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5
Q

What’s the minimum bend radius for a wire BUNDLE

A

6 times the outside diameter

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6
Q

What’s the minimum bend radius of a coax cable

A

10 times the outside diameter

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7
Q

How’s a wire checked to see if it’s been installed correctly into a connector

A

By tugging on it slightly

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8
Q

What should be carried out each time a connected is disconnected and reconnected

A

A functional test and a visual check of connector

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9
Q

Why’s is important to leave some slack before terminating a wire at a connector

A

to facilitate connector removal/replacement

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10
Q

What’s a drip loop and why are they carried out

A

A drip low is a downwards loop that’s provided to allow any moisture to drip off at a low point on the wire instead of dripping into a connector or plug

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11
Q

What’s important to remember about wires in a conduit

A

Not to be tied and must have a draw wire installed

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12
Q

At what point should drainage holes be fitted in conduits

A

At the lowest point

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13
Q

How’s a over braid shield identified

A

With a W number

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14
Q

What’s an AP wire and under what conditions are they aloud to be fitted

A

Aromatic polyamide and they’re not aloud to be fitted to the aircraft and are only aloud on the aircraft if they was there on manufacturing

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15
Q

What’s important that’s done with wires to ensure they’re protected

A

They’re separated to ensure that if one fails that they don’t fail together

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16
Q

What are the dangers present with electricity?

A

Electric shocks
Burns
Fire
Explosion

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17
Q

Why are drip loops installed

A

To prevent fluid contamination

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18
Q

Why are drip loops installed

A

To prevent fluid contamination

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19
Q

What are the 3 types of separation

A

Separation between power sources
Separation between redundant system circuits
Separations between emc circuits that aren’t compatible

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20
Q

How are electrical circuits which are necessary for wire separation separated?
If the solution isn’t available what can be done?

A

They should be put into separate harnesses and if not achievable they’re put in the same one but with sleeves and shielded wire

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21
Q

What are the six groups wires are grouped into?
It’s fucking aids but the old man said to remember

A
  1. G-Generation
  2. P-Powerdistribution
  3. M-Miscellaneouscables
  4. S-Sensitivecables
  5. R-Audiocables
  6. T/U/V-Coaxialcables
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22
Q

When preparing to work on de-energised circuits ensure what?

A

-The external power is switched off
-The battery is disconnected
-Red safety tags are fitted

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23
Q

What intervals are clamps placed at

A

Every 24 inches

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24
Q

What does the damage out of voltage and amps?

A

Amps

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25
Q

Where must rubber fillers not be used

A

In clamps carrying Coax cables

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26
Q

In what areas should you never use electric tools that deliver more than 0.02 millijoules of energy?

A

Fuel tanks or flammable vapour areas

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27
Q

What temperatures must plastic clamps not exceed

A

250 FAHRENHEIT (121 Celsius)

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28
Q

Where can metal clamps be used

A

Anywhere as long as the correct insulation is used

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29
Q

What must insulating tape be used on and why

A

AP wires to prevent damaging the insulation

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30
Q

If nylon clamps use a spacer what must also be fitted and what effect does this have on the use ability of it?

A

A washer ans can’t be used in fuel tanks in case they come loose

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31
Q

When would a suitable grommet be required to be fitted when wires are passing through a hole

A

If the gap between the wires and the hole is less than 1/4 of an inch

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32
Q

How can separation of wires also be achieved?

A

By clamping to structural tubing (not on tubing carrying anything)

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33
Q

How far must wire be separated from hot air ducts for airbus and Boeing

A

50mm airbus
1 inch for Boeing

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34
Q

What’s Boeings spacing requirements

A

That they must keep a minimum distance of 2 inches from fuel lines, hydraulic fluid lines, oxygen lines, control cables

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35
Q

What’s the preferred installation method of wire clamps

A

With the back resting On a structure and with the mounting screw Sitting above the wire

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36
Q

What tapes used for creating a sealant mould

A

Paper and vinyl tape
Paper must be fitted with a string to remove the tape after the sealants cured

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37
Q

What’s used to fill the gaps between wires and cables

A

Using coils and star spacers

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38
Q

Why are wire bundles tied

A

To provide ease of installation, maintenance and inspection

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39
Q

What material is used for tying and what one requires to be waxed

A

Cotton, nylon and fibreglass

Cotton is waxed ans us done to prevent moisture and mold

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40
Q

Where must ties not be used

A

In fuel tanks

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41
Q

At what intervals would ties be placed in normal conditions and in high vibration

A

They’d be positioned every 8 inches
Positioned every 2 in high vibration areas

42
Q

What can be done to prevent wire group breakouts or to protect wires

A

Installing additional wires with sleeving

43
Q

What are not allowed in unpressurised areas?

A

Plastic ties

44
Q

Wire bundles in the fuselage must be clamped when?

A

At every frame

45
Q

What size wires are plastic ties not aloud to be used on

A

Wires bigger than 10 awg

46
Q

What’s preferred, wire replacement or splicing

A

Replacement

47
Q

What’s the maximum amount of splices aloud per wire

A

3 other than the wires stated in production

48
Q

What’s important to remember about positioning of splices

A

They must be staggered

49
Q

What’s an indication of heat damage on a wire

A

Change in colour

50
Q

How many wire splices may be done in one section

A

No more than 2 per section

51
Q

Where can’t splices be used

A

In fuel tanks
In conduits
In clamps
Within 12 inches of termination device
In harnesses that are frequently bent

52
Q

What cables are not permitted for repair due to there critical impedance

A

Low range altimeters
Guide slope
Coax cable that’s already repaired

53
Q

What causes a high proportion of aircraft failures

A

Poor connections

54
Q

What’s a superchamp used for and what’s it’s not aloud to be used on

A

Used for stripping wire ans forbidden on crimping

55
Q

What determines whether to install pins or sockets at a connector

A

By establishing which side of the disconnect is live or hot

56
Q

What are the two general groups of connectors

A

Split shell and assembled

57
Q

What are the 5 groups of AN connector and what are they made from

A

A,B,C,D,K

A,B,C,D are aluminium
K is steel which makes it fireproof

58
Q

What’s the most common connector type

A

Assembled

59
Q

What’s the additional aid given for number contact configurations to aid in counting correctly

A

Every 10th contact is circled

60
Q

What are the order in which letters are used for indemnifying contact holes in a connector

A

Upper case
Then lower case
Then double uppercase letter

61
Q

Where do letter contact configuration start

A

Start outside finish inside

62
Q

What must be done to unused contact holes

A

They must be fitted with Teflon or nylon seal plugs

63
Q

What are coaxial cables used for

A

Interconnecting the components in the circuits transporting high frequencies

64
Q

What are polarisation keys used for

A

To prevent the wrong computer being fitted into the wrong shelf

65
Q

What does the keying code on the polarisation key also form

A

The last two digits on the connnector part number

66
Q

What’s soft solder made from

A

Tin lead alloy

67
Q

What’s soft solder used for

A

Electrical applications

68
Q

What’s silver solder made up from

A

Silver solder

69
Q

What’s the purpose of a flux

A

To remove the oxide from the surface being soldered to provide a good flow of solder into the joint

70
Q

What can happen if the connector is moved around while the solders setting

A

It can lead to a poor dry joint

71
Q

What does PIDG stand for

A

Pre insulated diamond grip

72
Q

How many unstripped wires are aloud per end cap

A

Only one

73
Q

What does CAU stand for

A

Circular area unit

74
Q

How is conductor crimp and barrel compatibility determined

A

Based on CAU

75
Q

How are phase a,b and c identification sleeves identified

A

A red
B yellow
C blue

76
Q

What’s the maximum number of terminals per stud

A

4

77
Q

What’s the maximum amount uninsulated and insulated terminals can be bent in restricted places?
And for installation on a terminal block?

A

90 degrees in a restricted place
30 degrees on a terminal block

78
Q

How many times can a terminal be bent

A

1 time

79
Q

How many contacts can a terminal module accommodate

A

10 or twenty one contacts

80
Q

What’s bonding

A

process of obtaining the necessary electrical conductivity between the component metallic parts of the aircraft.

81
Q

Why must non conducting paints and anodising films be removed prior to bonding

A

TO ensure a low resistance for bonding leads

82
Q

How many grounds must be installed in fuel vapour areas

A

Two

83
Q

As a general rule what should the resistance values be for grounding

A

0.0025

84
Q

What are the usual voltages used for testing insulation

A

250 or 500V

85
Q

When should insulation testing only be carried out

A

When the wires disconnected from there system at both ends

86
Q

What machines used to test continuity

A

Ohmmeter and multimeter

87
Q

When must continuity tests only be carried out

A

On circuits with no power applied

88
Q

What’s used to test coax cable

A

TDR (time domain reflectometry

89
Q

What’s Boeing use for there wiring manual

A

Swpm

90
Q

What’s airbus use as there waiting manual

A

Espm

91
Q

What’s a GVI

A

General visual inspection and it’s done at touching distance unless specified

92
Q

What’s a DET

A

detailed inspection that allows tactile examination to determine condition

93
Q

What are the 3 vibration levels

A

1 = not high vibration
2 & 3 are high vibration

94
Q

What’s a SWAMP area

A

Severe weather and moisture prone

95
Q

Why is it important to clean up swarf and dust

A

Because they are flame catalysts

96
Q

What’s required to ensure electrical equipment stays in good condition

A

An annual clean up

97
Q

Why’s cleaning of electrical equipment important

A

As damage may also be detected during the process

98
Q

What are the three types of contamination

A

Fluid
Environmental
Solid

99
Q

What are conduits 2 subgroups

A

Open and closed conduits

100
Q

What are regulations must be followedwith conduits

A

No ties
A drainage hole must be installed at the lowest point
A draw/pull wire must be installed

101
Q

What knot do we do

A

Clove hitch and square knot

Kemble (39 decks)

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