6:11 Electrical Cables And Connectors Flashcards
What is a wire
An isolated single copper conductor surrounded with insulation
What is a cable
A group of two or more conductors, with or with out shielding, separately insulated and grouped together by an outer sleeve
What is the selection of the correct type of suitable alternative made in accordance with
The aircrafts wiring diagram manuals
What is a stranded copper conductor normally used for
Maximum wire flexibility
The strands are tinned, nickel or silver plated
What are wires with aluminium conductors are only used for what types of loads
Large loads like galleys for weight saving purposes
What type of materials are used for wire insulation
A variety of different materials, all consist of high quality plastics
What characteristics must wire and cable insulation have
- Voltage resistant up to 600v
- Resistant to all aircraft fluids
- Highly flexible
- Strong
- Lightweight
What are wire types manufactured in accordance with
Military specifications (MIL)
Wire types are categorised into different temperature ranges, what are they
- Up to 100/150°c (normal)
- Up to 250°c (high temp)
- Up to 400°c (fire resistant)
What are shielded wires
They are used in systems to protect against outside erratic signals and magnetic interference
Are shields around single wires or multi conductor cables
Both
In signal circuits operating below 50khz, how is maximum protection achieved
By grounding the shield on one side only
Shielded ARINC 429 databus is grounded on how many ends
Both ends
What are coaxial cables used for
For transmitting high frequency signals only e.g communication transmitter cables
Transport of high frequency signals in coax cables are had when…
Both sides are grounded
How are coax cables manufactured
With single or stranded cores in a temperature range of -40 to 84°c
What requires the manufacturers legend and cable information to be printed on the cable
ISO 2574
How frequently must the cable type and information be printed on the outside
Every 150-500mm
What type of information must be printed on cables
- Specification (wire type)
- Manufacturer
- Country of origin
- Year of manufacturer
- ## Wire size (AWG)
What coloured wire ties do (type s) wires need to be tied with
Pink
How much weight and space does Aramaic polyamide save
50% weight and 30% space
Other than weight and space saving what other advantage does aromatic polyamide provide
High resistance to temperature
What is the biggest disadvantage of aromatic polyamide
Dry arc tracking and wet arc tracking
What precautions are done to help prevent carbon arc tracking
- Prevent damaging insulation
- Replace any damaged insulation
- Bend radii should be as large as the circuit allowed
- Strictly forbidden to test with puncture rod
What are (EGT)Exhaust gas temperature conductors made from
Alumel and Chromel
What must alumel and chromel conductors be repaired with
Alumel with alumel and chromel with chromel
What colour are thermocouple wires normally
White and green
For fire warning system wires what sort of temperature resistance or range must they have
Normal range up to 400°c with a maximum fire resistance if 1093°c(2000°f) for 5 mins
What colour are fire warning insulation wires normally
They are normally red but also can be white
What 2 basic groups do connectors get put in to
- Split shell
- Assembled
How many types of AN connector are there
6
Name all of the AN connectors
Class A - General purpose (solid one piece)
Class B - Back shell separates in to 2 parts
Class C - Pressurised connector
Class D - Moisture and vibration resistant
Class K - Fire proof
What are the different AN connectors made from
A,B,C,D - Aluminium
K - Steel
What are the most common type of connectors
Assembled
What increments do shell size go up in
1/16 inch
What does the letter ‘s’ mean in shell sizing
Short housing
Where cable identification is denoted in letters what is the order in which they are done
- Upper case
- Lower case
- Double upper case
What must unused holes be filled with
Nylon or Teflon plugs
Most computers have what to prevent the wrong computer being fitted in to the wrong receptacle
A polarisation key
In what sort of areas would you find wire locking
Engines and areas of high vibration
What grade of locking wire is commonly used
0.02in/0.5mm corrosion resistant steel wire
What is done if a nut needs wire locking but there isn’t another nut to wire lock to
The nut can be wire locked to the structure providing that the safety wire length is less than 5.904in or 15cm
