6.11 Flashcards
Copper is used for _____ wires
Small
Aluminium is used for _____ wires
Bigger wires
Plating is used to
Increase corrosion resistance and helps crimping connection
Name all Aircraft Power Sources
Engine Generator
APU
GPU
RAT
DC Battery
Temp of Tin plating on Copper
105 °C
Temp of Silver playing on Copper
200 °C
Temp of Nickel Plating on Copper
260 °C
Temp of Nickel Clad on Copper
260 °C
Aluminium Max Temp
105 °C
Two types of Insulator Construction
Extrusion
Wrapping
AWG
Small Number = Big Wire
Even numbers only
Temperature
Cables have a Max Cont Op Temp
Current Causes Heatloss, 40 °C
Wet Arc Tracking
Crack in two wires
Water is a conductor and connects both wires
An arc occurs
Water Evaporates ( 1000 °C)
Cracks Grow
Abrasion
Friction
Occurs in High Vibration Areas
Can be fixed via Loom Rigidity and Protection
Knuckling
Excessive Tension Forces
Can cause a Short
Red Plauge
Silver plating on Copper
Damage + Moisture = Red
Glycol Fires
Deicing Fluid + Silver = Fire
Poor Solderability
Loss of Free tin or plating over time causes wires not being able to be soldered
Fix : Tinned in Prep for Solder
3 classes of Cable
Single Core Single Strand
Single Core Multi Strand
Multi Core
What is better per unit of weight
Copper or Aluminium
Aluminium
Single Core Single Strand
Parts
Annealed / Tinned Copper
PVC or PTFE
Single Core Multi Strand
Parts
Annealed / Tinned Copper
PVC or PTFE
Airframe Cables
Twisted Shielded Pair
“Open” General Wiring
Need to be Robust and Withstand Environment
Very Thin insulation
Interconnect Cables
Twisted Shielded Pair
Avo bay Racks
Thinner than Airframe Cables
Saves weight + space ( more abrasion)
Increased Flex
Equipment Cables
Within Equipment or Componets
Very Flexible and suitable for solder to PCBs
Fire Resistant Cable
Resistant for 5 mins
Fire Proof Cable
Resistant for 15 mins
Twisted Shielded Pair
Airframe and Interconnecting
Prevent interference
May have a sheath
Used for Data
Coaxial Cable
Radio Cable
Limits Interference
Coaxial Cable Construction
Insulation
Metal shield
Dielectric
Core
High Tension Cables
High Tension = High Voltage
20,000 to 50,000 volts
Used in Igniter Plugs
EASA CS-25 . 1309
Equipment Systems And Installations
Avo Flight Systems and Internal Aircraft Systems
EASA CS-25 . 1353
Electrical Equipment and Installation
Used for Generators, Contractors and Heating Units
EASA CS-25 . 1355
Distribution Systems
Wiring Network
EASA CS-25 . 1359
Fire and Smoke Protection
What are the 2 principal requirements for a wire carrying current
Without overheating
Without voltage drop
A larger wire can
Carry more current
Aluminium wires not used below AWG __ and why
AWG 6
Too brittle
Positive Temp Coefficient
As Temp increases Resistance increases
Negative Temperature Coefficient
As Temp Increases Resistance drops
What is Earth Return System
Lets aircraft be part of electrical circuit
What is used to bond aircraft panels together for Earth Return System
Bonding Straps
What is terminal removed first when removing battery
Negative
What does an Anti Corrosion Washer do
Prevent Electrolyte Action between Assy
Where are Corrosion Washers used
Earth points on Structure
Where are bus blocks mounted
Directly onto airframe
AC Neutral and DC Earth cables cannot be
Connected to the same earth point
Identification of earth points
Letter marker on ground wire
ID letter on structure
How often are code numbers printed on wires
3 inches from terminal
6ft increments after that
Or 150mm to 500mm
Or 2 feet
How are code numbers marked on a wire
Hot stamping or ID heat shrinks
N or GN
Ground or Earth
V
High voltage side of single phase power circuit
A B C
3 phase AC power
A
First segment or Power Source
What wires cannot be hot stamped
High Tension wires
What is SWG
British Wire Gauge
What is the most common type of cable termination
Crimped
How much must the wire stick out from distortion point in AMP terminals
1mm
What is a crimp
Deliberate distortion of terminal shank to secure terminal to conductor
What does the Dot indicate in AMP terminals
Correct Tool and Tool Position
What AWG size is In AMP is Small Yellow
26-22 AWG
What AWG size is In AMP is Red
22-16 AWG
What AWG size is In AMP is Big Yellow
12-10 AWG
What AWG size is In AMP is Blue
16-14 AWG
How many dots on Yellow in AMP
1
How many dots on Red in AMP
1
How many dots on Blue in AMP
2
How do AMP tools show the correct tool for the crimp
Coloured Handles
Where are Inline Splices used
To join two cables
What is the size limit for In Line Splices
Cannot be used on wires bigger than AWG 8
What is voltage limit for In line Splices
240V AC RMS
What types of Cables can Inline splices not be used on
Thermocouples
Coaxial Cables
Earth stud or Earth Terminal Block
How many connections on One stud of a Bus block
Max 4
Max angle of connections on Bus Block
30 °
What size is Pneumatic Crimping tool used for
AWG 8 - 4/0
What pressure does Pneumatic Crimp tool operate at
6-9 Bar
What AWG size is Hydraulic Crimping Tools used for
AWG 6 to 0000
What shape is left after a Hydraulic Crimp
Hexagon
What are the 6 Letters left after Hydraulic Crimps
HH
HG
HN
What is the female of a Electrical Connector
Receptacle ( Structure / Component)
What is the male of a Electrical Connector
Plug ( Cable Side)
What are the 3 types of Connectors
Screwtype
Bayonet
Push pull
