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AV Fundies > ELH > Flashcards

ELH Flashcards

1
Q

Types of crimps

A

Type 1 - Indent crimp
Type 2 - Form crimp

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2
Q

Wire labels - Identify what each of the below characters refer to:

3 P 9 B 18 N

A

(Uncle Eddie Never Stops Saying Gagi)

First character (3) - Unit number

Second character (P) - Equipment identification

Third character (9) - Wire number

Forth character (B) - Wire segment letter

Fifth character (18) - Wire size number

6th character (N) - Ground, phase, thermocouple letter

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3
Q

Identification code for the below:

S
R
T
Y

A

S - Radar
R - Radio
T - Special electronics
Y - Armament special equipment

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4
Q

Construct of a coaxial cable?

A
  • Inner conductor
  • Tubular insulating layer
  • Tubular conducting shield
  • Many coaxial cables also have an insulating outer sheath or jacket
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5
Q

Things keep in mind when looming cables?

A
  • Comb them
  • Secure them with cable clamps
  • Bend radius
  • Drip loops
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6
Q

Distances for sleeve marking?

Standard cables
Coaxial cables

A

All cables:
- 3 inches from each end
- Every 3 ft or 90cm

Coax cables:
- 3 inches from the end
- 15 inches from each other
- Only sleeves (NO STAMPING) but treat it like direct marking

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7
Q

Calibration and functional serviceability check on mega?

A
  • Check calibration sticker
  • Connect the 2 wires together, set to 50v and press test button
  • Should read 0 resistance
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8
Q

How do we test coax using the mega?

A
  • one probe on the outside
  • one probe touching the centre
  • If the dielectric is doing it job then it will show loads of resistance
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9
Q

How do we test twisted pair with mega?

A
  • one probe on one wire
  • one probe on the other wire
  • If the resistance is high then the wires are not touching at all and this is good
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10
Q

Types of wires found in aircrafts?

A
  • Unshielded multi-conductor cable
  • Shielded single conductor cable
  • Shielded multi-conductor cable
  • Twisted pair cable
  • Coaxial cable
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11
Q

Types of wire markings?

A
  • Direct marking
  • Sleeve marking
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12
Q

Colour coding of copper terminal lug installations?

A

Red - 22, 20, 18
Blue - 16, 14
Yellow - 12, 10

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13
Q

When inspecting terminal blocks, what should you look for?

A
  • Grease, oil and foreign objects
  • Securely mounted
  • Wiring is securely attached
  • Wiring connectors are correctly positioned
  • Maximum of 4 terminal lugs / 3 terminal lugs and a bus bar
  • If sizes of terminal lugs vary, ensure they are layered largest at the bottom to smallest at the top
  • Tend to tighten
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14
Q

Definition for bonding?

A

Electrical connecting of 2 or more conducting objects not otherwise adequately connected

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15
Q

Definition of Grounding? and what does it assist to prevent?

A
  • Primary structure or earth or ground point
  • Prevent issues with static / lightning
  • Avoid sparking - fuel vapours lay low so you don’t want to connect to the aircraft and then have the static travel down the earth lead and cause sparking
  • Prevent electrical hazards
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16
Q

What is a bonding strap used for?

A
  • Braided wire
  • Anything that moves needs a bonding strap
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17
Q

What is Zinc chromate paint coating used for?

A
  • Protect against corrosion
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18
Q

Components of a Milliohm meter?

A
  • RX socket
  • LCD display
  • ZERO ADJUST Knob
  • Power Switch and Range Selector Switch
  • D-H Button
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19
Q

How to check calibration and serviceability of a milliohm meter?

A
  • Check cal sticker
  • Place the 2 leads together
  • Place the dial on the “200m ohm” position
  • Ensure 0.00 ohms is displayed
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20
Q

Methods used for discharging static electricity in an aircraft?

A
  • Earthing lead
  • Static discharge wicks
  • Null field dischargers
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21
Q

Difference between static discharge wicks and null field discharges

A

(Both bonded on trailing edge of the control surface)

Static discharge wicks - used on older, slower aircrafts due to lower speeds and lesser static to be discharges

Null field dischargers - used in modern aircrafts due to higher speed / increased static charges

22
Q

Why is insulation testing important?

A
  • Insulation breakdown can result in interference in things like radio frequency (RF)
  • Prevent short circuiting
23
Q

What piece of testing equipment is used to test insulation with the following characteristics?

High voltage

A

High voltage - Megger ohmmeter (Typically 50, 250, 500, or 1000 V DC)

24
Q

Components of a megger ohmmeter?

A

-LCD display
- Rotary selector switch
- Test button
- Lock button

25
Q

What is the megger ohm meter used for?

A

Testing conductivity

High resistance - low conductivity GOOD
Low resistance - high conductivity BAD

26
Q

What are the following crimp connections used for?

Form crimp
Indent crimp

A

Form crimp - Electrical wires are terminated with solderless terminal lugs to permit easy and efficient connections to and disconnection from terminal boards etc
(Hexagonal tool)

Indent crimp - Solderless splices join electrical wires to form permanent continuous runs
(Bullet)

27
Q

What is used to test the serviceability of a crimping tool?

A

Go / No go gauge

28
Q

Wire repair methods?

A
  • Single conductor wire splicing and repairs
  • Multi conductor wire splicing and repair
  • Single and multi conductor shielded wire splicing and repair
  • Broken wire contact removal
  • Connector removal and installation
29
Q

Restrictions for wire splicing?

A
  • Refer to pubs
  • Repairs requiring multiple splices, MUST be staggered
  • Splices MUST NOT increase the size of the bundle enough to restrict it from being used in the designated place
  • Splices are NOT to be used 12 inches from the termination
  • Not to be used on firing / control circuits for OE
  • No more than 1 splice in any wire segment between 2 connectors
30
Q

Must not conduct splice repairs in which 2 systems?

A
  • Ignition system looms and harnesses
  • Fire warning system looms and harnesses
31
Q

When are coax cables typically used?

A

To carry radio frequencies (RF) power from one point to another with a known rate of loss

32
Q

When are solder sleeves used?

A
  • Connect a cable shield to a ground lead
  • Terminate a cable
  • Repair or replace the cable shield
33
Q

3 portable tools commonly used for heating / soldering?

A
  • Infrared heating tool
  • HT-920B compressed air/nitrogen heating tool
  • Turbofan type heating tool
34
Q

Characteristics of electrical plugs / connections?

A
  • Typically round and self locking
  • Used in places where they can be frequently removed / connected
  • Blue band means that it is a rear release (the tool goes in the rear)
35
Q

Distance for bare wire to be left while soldering?

A

1 - 2 cable diameters

35
Q

What is the milli ohm meter used for testing?

A

Bonding testing

36
Q

What is the mega ohm meter used for testing?

A

Testing conductivity

37
Q

What is an acceptable solder

A
  • Under 45 degrees is acceptable
  • 1 - 2 wire
  • Shiny
  • Concave filled NOT CONVEX
38
Q

Fabrication of an ignition harness? How is it fixed?

A
  • Carries voltage
  • Replace the whole cable
  • DO NOT SPLICE
39
Q

Where is SDS found?

A

Chemalert

40
Q

What is important when you build up an earthing point?

A

Aluminium to aluminium

41
Q

Terminal board identification?

A
  • Cover has been removed
  • Identified by a part number ie. TB-2
  • The abbreviation TB stands for terminal board and 2 identified the specific terminal board number
42
Q

Lightning protection?

A
  • Careful shielding
  • Bonding
  • The application of surge suppression devices
  • Methods to discharge static charge
43
Q

What publication is referred to for the repair of a coax cable?

A

AAP 7045

44
Q

What publication is referred to for the repair of fire warning system harnesses?

A

None, the cable needs to be replaced

45
Q

Hardware found in aircrafts?

A
  • Clamps
  • Nuts
  • Screws
  • Washers
46
Q

Why are terminal boards used?

A

Convenient means of connecting individual wires

47
Q

What does the resistance across a bonding point need to be?

A

Less than 0.1

48
Q

What is a loom?

A

Type of flexible, braided insulating material put over wire or a bunch of wires to protect it against physical damage caused by heat and abrasion

49
Q

What is a harness?

A

A harness is a bundle of wires routing through an aircraft

50
Q

Loom tying?

A
  • Authorised flat pre-waxed cord
  • Square knot is used (modified clove hitch)

AV Fundies (11 decks)

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