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ELH Flashcards

(51 cards)

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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

Study These Flashcards
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?

Study These Flashcards
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

Study These Flashcards
A

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

24
Q

Components of a megger ohmmeter?

Study These Flashcards
A

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

25
What is the megger ohm meter used for?
Testing conductivity High resistance - low conductivity GOOD Low resistance - high conductivity BAD
26
What are the following crimp connections used for? Form crimp Indent crimp
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
What is used to test the serviceability of a crimping tool?
Go / No go gauge
28
Wire repair methods?
- 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
Restrictions for wire splicing?
- 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
Must not conduct splice repairs in which 2 systems?
- Ignition system looms and harnesses - Fire warning system looms and harnesses
31
When are coax cables typically used?
To carry radio frequencies (RF) power from one point to another with a known rate of loss
32
When are solder sleeves used?
- Connect a cable shield to a ground lead - Terminate a cable - Repair or replace the cable shield
33
3 portable tools commonly used for heating / soldering?
- Infrared heating tool - HT-920B compressed air/nitrogen heating tool - Turbofan type heating tool
34
Characteristics of electrical plugs / connections?
- 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
Distance for bare wire to be left while soldering?
1 - 2 cable diameters
35
What is the milli ohm meter used for testing?
Bonding testing
36
What is the mega ohm meter used for testing?
Testing conductivity
37
What is an acceptable solder
- Under 45 degrees is acceptable - 1 - 2 wire - Shiny - Concave filled NOT CONVEX
38
Fabrication of an ignition harness? How is it fixed?
- Carries voltage - Replace the whole cable - DO NOT SPLICE
39
Where is SDS found?
Chemalert
40
What is important when you build up an earthing point?
Aluminium to aluminium
41
Terminal board identification?
- 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
Lightning protection?
- Careful shielding - Bonding - The application of surge suppression devices - Methods to discharge static charge
43
What publication is referred to for the repair of a coax cable?
AAP 7045
44
What publication is referred to for the repair of fire warning system harnesses?
None, the cable needs to be replaced
45
Hardware found in aircrafts?
- Clamps - Nuts - Screws - Washers
46
Why are terminal boards used?
Convenient means of connecting individual wires
47
What does the resistance across a bonding point need to be?
Less than 0.1
48
What is a loom?
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
What is a harness?
A harness is a bundle of wires routing through an aircraft
50
Loom tying?
- Authorised flat pre-waxed cord - Square knot is used (modified clove hitch)

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