6.5.4 Flashcards
How is a upset head of a rivet formed?
Deformation of the shank
What is the rule of thumb when selecting a rivet size?
A rivet is to be 3 times the thickness of the thickest sheet being joined
What type of rivet is used in the ‘as fabricated’ condition?
US material 1100
What rivets are heat treated by the manufacturer?
2017, 2117, 7050
Why are 1100 aluminium (A) rivets not used on aircraft?
They’re too weak and soft
What are 2117 (AD), 2024 (DD) and 2017 (D) rivets made from?
Aluminium alloy
How are 2117 aluminium alloy (AD) rivets identified?
A small simple on the head
How are 2017 aluminium alloy (D) rivets identified?
By a raised dot
How are 2024 aluminium alloy (DD) rivets identified?
Two raised dashes
How are 2024 aluminium alloy (DD) rivets stored after heat treatment?
-10°F or lower
How quickly should 2024 aluminium alloy (DD) rivets be driven after removal from the freezer?
15 minutes
If a rivet is removed from cold storage and not used what must happen?
The rivet must be thrown away
What are 5056 aluminium alloy (B) rivets alloyed with and why?
Magnesium to be used to avoid dissimilar metal contact
How are 5056 aluminium alloy (B) rivets identified?
A raised cross
When are corrosion-resistant steel (F) rivets used?
Fastening corrosion-resistant steel sheets
How is the identification of corrosion-resistant steel (F) different?
They have no markings
What are Monel (M) rivets made from?
Nickel alloy
How are Monel (M) rivets identified?
With a raised r
How are titanium (T) rivets identified?
A raised V or T
When are titanium (T) rivets used?
When fastening steel alloy and titanium alloy together
If a rivet has a part number of MS20470 AD 5 - 12 what is its rivet diameter?
It is 5
If a rivet has a part number of MS20470 AD 5 - 12 what is its rivet grip length?
It is 12
What are the two parts to a Hi-Lok and Hi-Lite?
The threaded pin (bolt) and the collar (nut)
Why does the pin of a Hi-Lok have a hexagonal recess at the end?
To hold it in place during installation
When does the hexagonal drive-end shear off?
When it has reached its correct torque value
Pins and collars are usually supplied lubricated, what must you do before use?
Remove the lubrication
What is the difference between a Hi-Lok and a Hi-Lite?
A Hi-Lite does not have a thread run out area to save weight as it is useless
What is one benefit of using a taper-Lok?
It has a balanced stress radius
How is a lock bolt installed?
The pin is placed from the other side of the material and then the head is pushed down onto the pin from your side and the left over pin is removed
How is a blind lock bolt installed?
You place the fastener in the hole and use the installation device to pull the pin through to creat heads on both sides
If a lock bolt cannot be used due to access then what should e used?
a Hi-Lok
When repairing lock bolt holes what type of lock bolt should be used?
CRES or titanium pins
What are the three different procedures for installing a lock bolt?
- interference or transition fit
- clearance fit in thin structure
- clearance fit in thick structure
Why is it important to handle a cherry lock the least you can?
To try keep it lubricated from manufacture
When are oversized cherrylocks used?
When a rivet has been removed and the next size up isn’t possible
Why should you used a rivet catcher on a cherry ax rivet?
Because the mandrel falls away and becomes FOD
What are the two types of tucker ‘pop’ rivets?
Break head and break stem
Why are tucker ‘pop’ rivets not used on aircraft?
Loosen with vibration and difficult to remove when loose
What is meant by grip length?
The combined thickness of the material about to be joined
Why must you never file down a blind rivet fastener?
Because it will weaken the lock
What is a rivnut and why is it used?
It is a rivet with a hollow threaded centre to allow quick attachment and removal on sheet metal
