Avionics 103 Final Flashcards
Pitting on a solder joint is cause by:
-Moving the soldered item while solder is still in liquid form
- a good solder joint
- a bad quality solder being used
- too much heat
Too much heat
A cold solder joint has an increased resistance to current flow
- True
- False
True
A good solder joint should be shiny with slight ripples in it.
- True
- False
False
EMI stands for
Electro-magnetic Interference
Shielded wires are used to reduce EMI.
- True
- False
True
A daisy chain is designed so that if any one solder connection breaks, all the wires are still grounded through that daisy chain.
- True
- False
False
It is ok if a strand sticks out of the solder sleeve.
- True
- False
False
Contact cleaner needs to leave no residue.
- True
- False
True
Tinning the solder tip will prevent it from______
- heating
- melting
- soldering
- oxidizing
Oxidizing
Proper solder adhesion requires the metal surface to be_______.
- solder free
- clean
- greasy
- cold
Clean
Solder wick is used to______.
- remove solder
- solder in small parts
- cleaning the solder iron tip
- removing flux
-Remove solder
A cold solder joint is caused by_______.
- a solder bridge
- using the wrong solder
- insufficient heat
- acid core solder
insufficient heat
Tinning the wire is not required if you are putting the wire in a solder ring.
- True
- False
False
A dull finish indicates a good solder.
- True
- False
False
What is the purpose of the daisy chain?
- To prevent EMI
- So one side of wire bundle can be grounded
- All of the above
All of the above
How do you know when the solder ring is properly melted?
- When the heatshrink is completely melted
- When the solder ring is completely melted
When the solder ring is completely melted
Why is heatshrink used over solder connections?
- To support the solder joint
- To protect the solder joint from over heating
- To help prevent shorting of the solder joint
- All of the above
To help prevent shorting of the solder joint
What are the two ways of removing excess solder from a joint?
- Solder wick and using your solder iron to pull solder onto your solder tip
- Solder wick and solder sucker
Solder wick and solder sucker
What is the purpose of cleaning the inside of an electrical connector before soldering wires in the connector cups?
- To remove dirt and debris out of the connector to improve solder adhesion
- To clean minor corrosion
- All of the above
All of the above
Why would changing tip size change the way you apply solder?
- You will need more solder to get the job done.
- You will need to adjust the application based on more or less heated surface on the tip.
-You will need to adjust the application based on more or less heated surface on the tip.
If you are doing multiple buttsplices in a bundle at the same location, you need to make sure that the buttspices are______.
Staggered
If you are doing the tyco buttsplice in a protected area, it is allowed that you can leave off the heatshrink sleeve.
- True
- False
False
The wires are loose in the backshell clamp. You can use ___________ to build up the diameter, so it fits snug into the clamp.
Guideline tape
It is not necessary to connect the shield if you are crimping a new section of shielded wiring.
- True
- False
False
Where do you find the information for trimming a coax so it will work with the BNC?
- Get the information off the crimper
- Research the part number to identify the correct crimper
- Research the part number to find the manufacturer’s drawing for the trimming dimensions.
Research the part number of the coax to find the correct dimensions.
Research the part number to find the manufacturer’s drawing for the trimming dimensions.
Your braid must be under the sleeve when you crimp it. None of the braid appears outside of that sleeve.
- True
- False
True
You can use your plastic removal/extraction tool for a front release connector.
- True
- False
False
How many different types of environmental splices did you do in lab?
- 1
- 2
- 3
- 4
3
Where do you find the information to adjust the depth of the crimp on your contact before installing it in your connector.
on the locator
If you tug on the contact after crimping and the wire pulls right out, what is the most likely problem?
- The wrong crimper was used
- You did not finish the crimp process
- The crimp depth was not set right
- The clip in the connector did not lock
The crimp depth was not set right
Out in the industry, if a pin does not lock in the connector, what can you do?
- Use superglue to install the pin
- Replace the connector
- Move the pin to a different location and correct the wiring diagram.
- Both B & C
Replace the connector
Molex pins are used on new technology and require specific crimpers.
- True
- False
False
Why is crimping more common in the industry instead of soldering?
- crimping is cheaper
- it is not, solder is used more
- crimping uses more expensive tooling
- crimping takes less time than soldering
crimping takes less time than soldering
You find a contact, and you do not know what the part number is, how would you find the part number?
- Look up the part number on the contact
- Go to a website and check based on color strips on the contact.
- Look up the connector part number to get the part number.
Go to a website and check based on color strips on the contact.
There are two different set names for the pins in a connector, give one set of names.
pins and sockets
How do you determine if a crimp is a good crimp? Give two things you would do.
- Give it a tug and visually inspect the crimp
- Give it a tug and make sure it locks into the connector.
Give it a tug and make sure there are no strands sticking out.
Ring it out and give it a tug.
Ring it out and give it a tug.
It is okay to crimp something twice, if you are not happy with the first crimp.
- True
- False
False
The crimp on the pin is located where?
- The barrel where the insulator goes in.
- The barrel where you would see color stripes
- All of the above
The barrel where you would see color stripes
Crimp connectors have two types of release systems to allow the pins to be removed. What are those two types?
front and rear release
You must always hear the click when inserting a pin in the connector.
- True
- False
False
What is the type of locking mechanism does your silver connector have?
- Bayonet connector
- Breech-loc connector
- Acme Threads
Bayonet connector
When a connector has a hard plastic front, that tells you that it is a ________ release connector.
- Front
- Rear
Rear
What is the purpose of an environmental splice?
- To protect the bundle from the environment
- To protect the wire from rocks or gravel being kicked up into the wiring
- To protect the wire from weather or outside conditions
To protect the wire from weather or outside conditions
How do you know which crimp tool to use, when crimping a ring terminal?
- Research the part number to identify the correct crimper
- The crimper is based on wire AWG and is color coded
- You use the Tyco crimpers
The crimper is based on wire AWG and is color coded
How would you find the correct crimp tool for a connector?
- Research the part number to identify the correct crimper
- The crimper is based on wire AWG and is color coded
- You use the Tyco crimper
Research the part number to identify the correct crimper
When using the AC43-13-1B as a reference in a signoff, you can use the page number.
- True
- False
False
When using the AC 43-13-1B you are using a paragraph that has several specific sub-paragraphs in it. Only one of those sub-paragraphs apply to the job you did on the aircraft, you should always reference the whole paragraph.
- True
- False
False
The vertical lines down the side of sections of the AC 43-13-1B indicate_______
- nothing
- an optional version of the paragraph before
- new information based on previous publication
new information based on previous publication
You do not have to use the electronic version of the AC-43-13-1B out in the field?
- True
- False
True
When tying a lacing cord knot, it must have some room to move due to vibration.
- True
- False
False
The primary function of a service loop is to loop excess wiring, so wiring repairs can happen in the future.
- True
- False
False
When replacing copper wires with aluminum, what is the rule about the size of wire?
- You must go up (diameter) two sizes
- You must go down (diameter) two sizes
- The wiring remains the same
You must go up (diameter) two sizes
A conduit is designed to protect wiring that runs through it and must have a drain hole at its lowest point.
- True
- False
True
For shielded wiring to be successful, it must cover what % of the wiring.
85% coverage
Paragraph 11-106
Are most relays repairable?
Not repairable
Paragraph 11-48(c)
What knot should you use to tie a wire bundle running through the aircraft?
Clove hitch secured with a square knot
paragraph 11-158(b)
What is the primary function of a service loop?
To provide ease of maintenance
Paragraph 11-135
How is a service loop inspected?
Adequate length, Breakout Point, Routing, Harness Termination
Paragraph 11-139 (a, b, c, d)
What is the maximum allowable slack in a wire bundle between two clamps?
Slack not exceeding ½” deflection off center
Paragraph 11-118
What does SWAMP stand for? Give its definition.
Severe Wind And Moisture Problems
Are shielded wires used to reduce EMI?
Yes
Ratcheting crimpers must be used for insulated terminals.
- True
- False
True
How many splices can be in one segment? What is a segment?
There should not be more than one splice in any one wire segment.
A “segment” is any section of wire “between two connectors or other disconnect points.”
Why are splices in a bundle must be staggered?
To minimize any increase in the size of the bundle, preventing the bundle from fitting into its designated space, or cause congestion that will adversely affect maintenance.
Why would you have a drain hole in a conduit? Where would it be located?
Prevent moisture entrapment.
At the lowest point in a conduit run.
“Ringing out” is specific to shorts and continuity checks is specific for opens.
- True
- False
False
A circuit breaker popping indicates what?
Short
When using a TDR, a short is indicated with the line going _______.
- Up
- Down
- Stays the same
Down
An aircraft wiring diagram gives the technician an idea of how much resistance is in that circuit.
- True
- False
False
When using a TDR, an open is indicated with the line going ______.
- Up
- Down
- Stays the same
Up
Can you use a TDR to troubleshoot an open?
- Yes
- No
Yes
What does TDR stand for?
time domain reflectometer
A wiring diagram gives the amount of amps running through the wire?
- True
- False
False
What is the proper way to cut plastic wire ties?
- with scissors
- with a knife
- with semi-flush diagonal pliers
- with flush-cut diagonal pliers and cut flush.
with flush-cut diagonal pliers and cut flush
A gasket or sealant is used between the antenna mast and the fuselage skin_____.
-to prevent the entry of moisture
Wires running in a bundle between two clamps should be secure and should not have any slack.
- True
- False
False
A pattern of static indicates EMI.
- True
- False
True
What does EMI stand for?
electro-magnetic interference
Looking at a wiring diagram. You see two wires running from connector A to connector B. These wires have a circle around the two wires at the ends of the wires near connector A and B. What does those circles mean?
shielded wires
Can you use a Meggar to troubleshoot an open?
- Yes
- No
No
You have a write up that states that the C/B pops when power is supplied you have changed everything and rang out wires with your meter. How would you continue troubleshooting this short?
Use a meggar
When troubleshooting a live circuit with voltage on it, that can not be disconnected because of other work on the aircraft. Can you do a continuity check.
- Yes
- No
No
