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M7 > EWIS > Flashcards

EWIS Flashcards

1
Q

Where should you never use electric tools delivering more than 0.02 millijoules of energy?

A

Fuel tanks or flammable areas.

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2
Q

Where are plastic ties not allowed?

A

Unpressurised areas.

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3
Q

How far must wire bundles run from lines carrying flammable liquids?

A

50mm

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4
Q

What distance can wire bundles be from lines not carrying flammable liquids?

A

15mm

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5
Q

What is the minimum bend radius for single wires or cables?

A

3x outside diameter

Preferred is 10x

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6
Q

What is the minimum bend radius for wire bundles?

A

6x outside diameter

Preferred 10x

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7
Q

What is the minimum bend radius for single coax cables?

A

10x outside diameter.

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8
Q

How often must wire bundles be clamped in a fuselage?

A

Every frame.

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9
Q

When a wire bundle is dressed downward to a connector, what must be installed?

A

A drip loop to prevent fluid contamination.

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10
Q

Can wires be tied together in a conduit or insulating sleeve?

A

No.

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11
Q

A bundle with an over braid shield must have what identification.

A

A W number (within 18 inches)

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12
Q

What are AP wires?

A

Aromatic Polyimide.

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13
Q

What essential wire systems must be separated?

A

Stab Trim, auto flight, essential power.

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14
Q

What is EMI

A

Electromagnetic interference

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15
Q

What is the minimum distance between secondary routes?

A

25mm (unless physical barrier installed eg. Conduit.)

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16
Q

What are the 6 wire categories?

A 
G- generation
P- power distribution
M- miscellaneous 
S- sensitive cables
R- audio 
T/U/V- coaxial
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17
Q

What distance do cable clamps support wires?

A

Intervals not exceeding 24 inches.

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18
Q

What fillers can not be used in coax cables?

A

Rubber.

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19
Q

What temps must plastic clamps not be used?

A

Above 250 Fahrenheit (121 celsius)

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20
Q

What clamps can be used anywhere provided they are fitted with insulation material?

A

Metal

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21
Q

What wires must be wrapped with insulation tape?

A

Aromatic polyimide.

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22
Q

What must be fitted is a nylon clamp uses a spacer?

A

A washer.

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23
Q

Are washers, tapes or ties allowed in fuel tanks?

A

No.

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24
Q

What must be fitted to edges of wire bundles if 3/8 separation cannot be achieved?

A

Grommets.

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25
Q

What lines cannot be clamped be clamped to wire bundles?

A

Liquid lines.

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26
Q

What are harpoon ties used on?

A

Raceways.

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27
Q

What is normally used to create a sealant mould for pressure sealing?

A

Vinyl tape.

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28
Q

What materials can be used for wire bundle cords?

A

Cotton (waxed), nylon or fibreglass lacing cord.

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29
Q

Can wire bundle ties be placed inside conduits?

A

No.

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30
Q

How often must wire bundle ties be used?

A

Every 8 inches (2 inches in high vibration areas)

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31
Q

What are the 2 knots for wire bundles?

A

Clove stitch and square knot.

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32
Q

What size wire must wire ties not be used on?

A

Larger than 10 AWG

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33
Q

What temperature must plastic wire ties not be used?

A

Above 85 Celsius (185 Fahrenheit)

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34
Q

What’s the maximum number of splices in 1 wire?

A

3

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35
Q

What tape can only be used outside pressurised zones?

A

Aircraft fluid resistant tape

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36
Q

What grade tape can only be used in high temperature areas?

A

Grade D

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37
Q

What is the maximum number of splices in one wire segment?

A

2

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38
Q

How far must splices be away from a termination device?

A

12 inches

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39
Q

What cables can not be repaired?

A

Low range altimeter, glide slope, coax cable that has already been repaired.

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40
Q

How many inches must dead ends be accomplished with connectors?

A

4-6 inches

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41
Q

What is the automatic hand wire stripper called?

A

Stripmaster (strips slug up to 7/8 of an inch)

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42
Q

What is the Superchamp wire stripper forbidden from doing?

A

Crimping

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43
Q

What is installed on the hot side of connectors?

A

Socket type contacts to minimise risk of electric shock.

44
Q

What are the 2 basic groups of connectors?

A

Split shell construction

Assembled construction

45
Q

What are split shell connectors identified by?

A

AN numbers

46
Q

How many basic types of connector are there?

A

6

47
Q

How many classes are the groups of AN connector divided into?

A

5 (Class A, B, C, D, K)

48
Q

What is a class K AN connector?

A

Fireproof (made of steel)

49
Q

What is the most common type of connector?

A

Assembled.

50
Q

What provides an interfacial seal at the end of a connector housing?

A

A Follower

51
Q

What size is the shell size of a connector denoted in?

A

1/16 increments (S denotes short housing)

52
Q

Which direction is the master key installed?

A

Forward in relation to aircraft.

53
Q

What happens to every 10th contact on a connector?

A

Circled.

54
Q

What is the order of precedence on connectors?

A

Upper case, lower case, double upper case

55
Q

Are all connectors environmentally sealed?

A

Yes

56
Q

What are all unused contact holes fitted with?

A

Nylon or Teflon seal plugs.

57
Q

What are used to interconnect high frequency signals?

A

Coaxial and connectors

58
Q

What are polarisation keys for?

A

Prevents the wrong computer being inserted into the shelf.

59
Q

What forms the last 2 digits of the connector part number?

A

The keying code.

60
Q

Are all connector contacts inserted from the front or rear?

A

Rear.

61
Q

What are the 2 general systems for the removal of connector contacts?

A

Front release

Rear release

62
Q

What are the standard crimp size contacts?

A

12, 16, 20

63
Q

What is soft solder made of?

A

Tin lead alloy

64
Q

What is soft solder recommended for and why?

A

Electronic applications, lower melting point (358 Fahrenheit)

65
Q

What is hard solder?

A

Silver solder- for joints needing greater strength

66
Q

What is the purpose of flux?

A

Removes oxides from the surface and promotes better flow of solder around the joint.

67
Q

What could be evidence of a dry joint?

A

Dull appearance and movement in joint.

68
Q

Why are dry joints bad?

A

Fragile and have high resistance.

69
Q

What is a mechanical crimped alternative to solder sleeve pigtail?

A

Crimped breakout sleeve (K grip)

70
Q

What are PIDG terminals?

A

Pre Insulated Diamond Grip

Insulation sleeve unnecessary.

26-24 (yellow) 22-18 (red) 16-14 (blue)

71
Q

When are moisture proof splices used?

A

When full environmental seal is required.

72
Q

What categories are stratotherm splices split into?

A

Insulated and un-insulated

73
Q

What are SADA crimping tools?

A

Single action double action.

74
Q

What is the length of the breakout limited to?

A

2 1/2 in max

75
Q

What degree within each other can closed end splices be placed upwards aside eachother?

A

30 degrees

76
Q

Where must spare wire caps be installed in regards to connectors?

A

Within 4-6 inches

77
Q

How many unstripped wires are allowed per end cap?

A

1

78
Q

What is CAU?

A

Circular area units.

79
Q

What do CAU charts determine?

A

Conductor and crimp barrel compatibility.

80
Q

On wires smaller than 10 AWG how far must the sleeve extend?

A

Extend 1/16 past the end of terminal insulation.

81
Q

What is the maximum number of terminals on one stud?

A

4

82
Q

What is the maximum a terminal can bend in restricted spaces when installing?

A

90 degrees.

83
Q

What is the maximum terminals can be bent on a terminal block when installing?

A

30 degrees.

84
Q

How many contacts can a terminal module accommodate?

A

10 or 21

85
Q

What is aircraft electrical bonding?

A

Obtaining necessary electrical conductivity between the component metallic parts of the aircraft.

86
Q

What process can minimise radio and radar interference ?

A

Bonding.

87
Q

What must be done to ensure a low resistance connection for bonding leads?

A

Remove anodising films and non-conducting paint.

If done correctly, measurements no higher than 0.025ohms can be obtained.

88
Q

What is grounding?

A

Process of connecting electrical systems to the aircraft metallic structure and pre-designated points.

89
Q

Do dual grounds have to be installed in fuel tanks?

A

Yes.

90
Q

How is grounding measured?

A

Measuring resistance between ground and aircraft structure?

91
Q

What are the usual voltages for testing resistance?

A

250 or 500 volts.

92
Q

What is continuity testing?

A

Measuring if a circuit has a complete current path using a ohmmeter or multimeter.

93
Q

What is TDR?

A

Time Domain Reflectometry.

Send electrical impulse down a coax cable and picks up any reflections made by discontinuities.

94
Q

What pulse would an open coax cable reflect using a TDR?

A

Positive

95
Q

What is the only wire currently meeting FAA standards?

A

TKT wire

Lightweight, resistant to high heat producing smoke if it burns.

96
Q

In wires, what does aging refer to?

A

Health of a wire’s insulation.

97
Q

What 2 wires are especially a problem when rubbing against eachother?

A

Hard wire (kapton) and soft wire (Tefzel)

98
Q

What does GVI stand for?

A

General Visual Inspection.

99
Q

What is a DET inspection?

A

Detailed.

100
Q

What is EZAP?

A

Enhanced Zonal Analysis Procedure.

101
Q

Why are dust and dwarf bad for fires?

A

They are flame catalysts

102
Q

What are classed as hot gas areas?

A

Engines, struts, APU compartments, air condition bay

103
Q

What’s the maximum diameter of a wire harness that a nylon clamp can support?

A

1.25 inches

104
Q

What clamp is only permitted to support a wire harness greater than 1.25 inches?

A

Metal clamp with a cushion

105
Q

Where is the size of the slack of clamps especially important?

A

In high vibration areas.

106
Q

What are the 2 categories of conduits?

A

Open (split)

Closed

M7 (17 decks)

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