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Part 66 Module 7 > Module 7.7 > Flashcards

Module 7.7 Flashcards

1
Q

what is continuity testing ?

A

checking that an electrical system is connected and servicable

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2
Q

when continuity testing why must the power be off?

A

damage can be caused when measuring the system or to the multimeter or aircraft system.

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3
Q

what should the meter be set to if the resistance is unknown?

A

highest setting then work down

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4
Q

what will a multimeter need in an open circuit?

A

1 or 1/2

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5
Q

what must be known on a continuity test?

A

the expected reading

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6
Q

what should be done with parallel components?

A

isolate them

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7
Q

what should be done before a continuity test?

A

visual inspection

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8
Q

what two parts of info does a continuity test provide?

A

that there is an electrical link and the resistance of said link

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9
Q

on an aircraft, how could continuity test be conducted?

A

connecting to the airframe structure

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10
Q

on an analogue multimeter, what do they not require?

A

no battery, ohm requires it

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11
Q

why does a megger have a higher voltage than the system?

A

test at 3x the working voltage

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12
Q

what should be done to an LRU before insulation tests?

A

disconnect to the LRU

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13
Q

what does good bonding allow?

A

safe path for current flow

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14
Q

what resistance should a bonding check produce?

A

less than 0.05 ohm for primary, 0.02 ohm for comms and nav

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15
Q

what does bonding protect from?

A

static build up

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16
Q

what does good bonding allow?

A

ensures safety of aircraft and occupants

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17
Q

where would the master point be?

A

avionics bay. one for AC one for DC

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18
Q

where would dual grounding cables be used and why?

A

fuel tanks for resistance

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19
Q

what must never be done after stripping a wire?

A

touching it with your fingers

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20
Q

what are the most common types of electrical tooling?

A

Daniels(pins and sockets) and AMP/PIDG

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21
Q

how can a crimp be checked?

A

go/no go gauges

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22
Q

where would all standard electrical practices be found?

A

chapter 20

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23
Q

how long should the wire be stripped for the PIDG crimp?

A

half the barrel + 1/32

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24
Q

how much wire should protude from a crimp and why?

A

1/32

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25
Q

daniels tools produce an 8 compression crimp. what does this ensure?

A

maximum tensile strength

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26
Q

how much gap should the insulation and the barrel have?

A

1/32’’

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27
Q

what are the benefits of crimps?

A

-good conductivity
-uniformity of connection
-strength of connection
- corrosion proof

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28
Q

what is a way of checking the tool has crimped correctly?

A

Dot code

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29
Q

how are crimp tools distinguished?

A

colour of the handles

30
Q

what is the purpose of the insulation adjusting pins?

A

change how tight the grip is around the insulation

31
Q

what gauge of wire would you use a hydraulic crimping tool?

A

2 to 8 gauge

32
Q

what is the main difference between hydraulic and normal crimp?

A

hydraulic not latched, so it can be released during crimping (safety feature)

33
Q

what occurs when a hydraulic tool reaches the correct PSI?

A

it will release at roughly 2000 PSI

34
Q

how is an electrical crimping tool activated?

A

trigger or foot pedal

35
Q

how are crimp tools tested?

A

tensile test or pull test

36
Q

what will occur if the crimp is correct?

A

the cable will snap before the crimp fails

37
Q

what is the volt drop test?

A

pass current through and measure the drop between part A and part B. Making sure that the drop is in allowance limits

38
Q

what colour is the extraction tool for rear release?

A

white

39
Q

what are copper losses?

A

loss due to internal resistance

40
Q

what are electrical losses?

A

losses due to heating

41
Q

where are coax cables grounded?

A

grounded at both ends

42
Q

what are the differences between BNC and TNC?

A

TNC are threaded

43
Q

how can coax cables be tested?

A

continuity test e.c.t

44
Q

what does a TDR do?

A

tells how far along damage inside the cable is

45
Q

what do the last two digits of code on a cable signify?

A

wire gauge

46
Q

what amount of strands are cables typically made up of?

A

7 or 19

47
Q

when would aluminium be used in wires?

A

on cables with large current along a long distance

48
Q

where are interconnect cables used?

A

interconnecting of equipment in racks

49
Q
A
49
Q
A
49
Q
A
50
Q

how long should a fire resistant cable last under a fire environment?

A

5 mins

50
Q

where is an equipment cable used?

A

inside LRU’s and should not be touched

50
Q

what can be said about the insulation on thin walled cables?

A

thinner and high spec insulation

50
Q

how long should a fireproof cable last under a fire environment?

A

15 mins

51
Q

how do twisted cables minimise magnetic inteference?

A

they cancel each other out

52
Q

power feed cables are what gauge?

A

2 to 8

53
Q

what will happen to a coax if the bend radius is not adhered to?

A

the dielectric will be damaged

54
Q

conduits have what at the bottom to allow for drainage?

A

a hole

55
Q

when passing through a bulk-head what is required?

A

a grommet plus P clips to secure

56
Q

what must cable breakouts not do?

A

must not cross over the loom

57
Q

what should you secure coax with?

A

don’t tie

58
Q

what should be done to secure in high voltage areas

A

P clamps are the most common method

59
Q

where should looms be ran in relation to piping?

A

looms should be above piping

60
Q

what heating tool can be used on an aircraft?

A

hot air gun

61
Q

what are the three types of inspection?

A

-general vision inspections
-detailed inspections
-zonal inspections

62
Q

what can be used to aid in a GVI?

A

mirror, torch, magnifying glass ect

63
Q

what does dust not allow?

A

heat disapation

64
Q

what should be done to splices in the same area?

A

staggered

65
Q

detailed inspections take place more often in what environment?

A

high vibration

66
Q

when cleaning a cloth to clean looms, what must it be?

A

clean, dry and lint free.

Part 66 Module 7 (16 decks)

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