Flashcards
Mod 6 - Book 2
Cards in this deck (70)
- 1What three elements are required in an electrical circuit?- Power Supply
- Conductor
- Load - 2What are the important factors for a conductor?- Reliability under working conditions
- Ability to carry a specific Load - 3What things should you consider when selecting the appropriate wire?- Type of Conductor
- Flexibility of the wire
- Insulation material
- AWG
- Length of Wire
- Type of Installation - 4What are the common wire materials? Provide an example of where it'll be used on an aircraft.- Copper, Short connections
- Aluminium, long connections
- Steel, spark plugs - 5How can you make a wire more flexible?- Annealing
- Adding more strands - 6What is lays? How many types are there?Lays is the term used for grouping strands. There are four methods, Bunched Left lay, Bunched Right Lay, Concentric Stranding, rope stranding.
- 7Why do cables need to be insulated?to prevent short circuits
- 8What are the two methods used for insulation?Wrapping and Extruding
- 9What is carbon arc tracking?this is the phenomenon which can be caused in polyamide insulation. A small electrical arc is formed when there is a short circuit. when this happens a stable form of carbon is produced.
- 10What is flash over?this occurs when the carbon in the polyamide becomes greater in quantity and causes an explosion.
- 11What are the two types of carbon arc tracking? Explain Further?Dry arc tracking and Wet arc tracking.
Dry Tracking is when the conductor shorts against the aircraft frame through chafing. Wet Arc Tracking is the when the conductor shorts out via moisture entering through a damaged insulator. - 12What is the difference between the AWG in aluminium and copper?aluminium has more resistance therefore a thicker cable is required. it is two less than a copper awg.
- 13What is CMA? Units?Circular millimeter Area, 1000ths of an inch. Circular Mils
- 14Formula for CMA?D^2 * n (n=number of strands)
- 15what are the factors that determine resistance?- Temperature
- Conductor Material
- Length
- Cross Sectional Area - 16What are the three classifications that are given to aircraft cables?airframe, interconnected, equipment
- 17What is airframe cables?these are the cables that run through the aircraft on the airframe.
- 18what are interconnected cables?these are the types of cables used in protected areas such as racks, junctions and relay boxes.
- 19what are equipment cables?this is the type of cables used on the aircraft within the equipment.
- 20Name the basic types of cables used on aircrafts?- Single core
- Multi Core
- Screened
- Data Bus
- Coaxial
- Thermocouple
- High tension
- fire proof, fire resistant. - 21Where are thermocouple cables used?Temperature varying locations such as exhaust gas temperature, engine cylinder.
- 22What are the materials used in thermocouples?Nickel Chromel and Nickel Alumel
- 23Fire Proof cables and Fire resistant cables. What is the difference?Fire proof cables can withstand fire unto 15mins whereas fire resistant can only withstand fire for 5 mins.
- 24What information can you find on the cable spec?- Conductor Spec
- Voltage Rating
- AWG
- Country of Origin
- Manufacturer - 25How much should the bend radius be on a multi core cable or single core?10 times the outer diameter.
- 26How much should the bend radius be on a bundle or loom?6 times the outer diameter.
- 27How would you refer to connectors in engineering term?plugs and receptacles
- 28How is the connector constructed?- Contact
- Contact locking device
- Insulator
- Shell
- keyway - 29What are the connector styles?- Square Flange
- Free Plug
- Jam nut - 30What is a Bayonet Coupling circular connector?It has 3 locking holes on the plug and 3 fix locks on the receptacle.
- 31What is a Screw thread coupling connector?this is similar to the bayonet coupler, however it uses a threaded locking sleeve to couple the plug and receptacle.
- 32What is the keyway orientation?CD N AB from Datum.
- 33How is a the connector contact identified?Numbered or Lettered in a spiral pattern.
- 34How can you tell if the contact is not in use?there is a line before the contact.
- 35What does the dashed line suggest?Change in coding.
- 36What can you find on the contact identification?- Manufactures Prefix
- Type Number
- Class
- Shell size
- Number of contacts
- Contact style
- Orientation Code - 37What are the MS type numbers?MS3100
MS3101
MS3102
MS3106
MS3108 - 38MS3101Cable Receptacle
- 39MS3100Wall Receptacle
- 40MS3102Box Receptacle
- 41MS3106Straight Plug
- 42MS3108Angle Plug
- 43What are the circular connector characteristics?- Insulation withstanding up to 2300v
- Current rating 5A to 23A
- Insulation Resistance 5000 W
- Operating Temp -65 degC to 200 degC - 44Name some Circular connector accessories.- Grommet Nut
- Strain Relief
- Protective Cap
- QUIK TY
- Dummy Stowage
- Protective cap - 45What is the box measurement unit for an ARINC 404?10.12 Inch (Width) = 1 ATR (austin trumball radio)
- 46Whats is the measurement for an ARINC 600?MCU (Modular Concept unit) = 7.64" Height * 12.74" Length
- 47What is the minimum allowable width for a LRU (Line replaceable unit)?1.10" = 1MCU
- 48How many MCU in ATR?1MCU = 1/8ATR
- 49How many connectors are required for an ARINC 404? How many contacts?Single connector or Dual with unto 106 contacts?
- 50How many sizes of connectors are available in the ARINC 600 Family?3 Sizes. Config and Density.
- 51Why is a breakout box used? Describe the Set-up.Cable integrity checks and signal tests. 15 Rows and A-D or A-K Columns (NO I).
- 52What information can be found in the ARINC Connector ID?- Connector Series
- Class
- Shell Type
- Polarisation Position
- Shell Style
- Connector insert layout code
- Mod Code
- Customer Order code - 53Name a few Characteristics found in an ARINC Connector- Insulator withstanding unto 1500 - 1800 Volts rms
- Current Rating up to 5A to 23A
- Insulation Resistance +5kW
- Operating Temp -15DegC to 125DegC - 54Plugs contain, what?Number of Sockets
- 55Receptacles Contain a number of, What?Pins
- 56What is the maximum amounts of contacts used?64 held within a size 24
- 57How can you prevent contact displacement?by using the insert orientation.
- 58What is keyway orientation?this prevents mismatch and contact displacement.
- 59What does a dashed line circle represent in a connector?Change in case.
- 60What is one other way of avoiding mismatch in connections?Index Pin alignment.
- 61How many studs are in a typical terminal box?1-20 in single or double strips.
- 62Name the components in the terminal box.- Connector Bus securing bolt
- Terminal Numbers
- Terminal Stud
- Bus
- Insulation - 63What are the Stud tools called for specific tightening?Wordbook and Soltorque
- 64What should you be considering when connecting two or more terminals to a stud?you must ensure that the ring terminals are connected, the link is always at the base of a stud. Connecting more than 3 terminals you must use another bus.
- 65How much can you bend a ring terminal?90 Deg in RESTRICTED areas. But on terminal blocks it must not exceed 30 deg.
- 66Can you crimp a connection with the insulator still on?NO. insulation must be removed first.
- 67What is PTT?Precision Termination Tools, this is also known as a crimping tool.
- 68What is an Inline splice?this is the secure connection made between two conductors after modifications.
- 69how do we check if the PTT is working as it should?periodic: collaboration checks.
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