D- sheet metals and non metallic structures Flashcards
what is done with the Riverhead stem when a self plugging rivet is installed
it is draw up into the river shape, forming a plug in the hollow center of the rivet and continues until the portion of the stand breaks at a groove
Given an example of a self plugging mechanical lock rivet
Cherry lock, cherry max, cherry SST, Huck, Huck – clinch, or hook Max
describe the correct dimensions on properly formed, rivet heads
One – 1/2 diameter wide, 1/2 diameter tall
what is bonded honeycomb construction?
kraft paper, thermoplastics, aluminum steel, titanium, aramid paper, fiberglass, carbon, or ceramic
Name two causes of delamination or D bond of a honeycomb construction
Matrix cracks and high or low energy impacts
what is a potting compound repair used for and bonded honeycomb?
hole filling
what is done with the damaged area and bonded honeycomb?
The damage area must be removed
what will cause raising and transparent plastic panels windshields?
Stress, improper handling, and harmful cleaning solvent
what should be done to twist drills that are to be used for drilling completely through plexi glass
drill must be free from Nick‘s and burrs that would affect the surface finish
what calculation must be made when bending sheet metal?
Bend allowance and setback
what must be done when two Bends intersect
Relief holes are drilled at the intersection
What methods are used in forming sheet metal?
Shrinking, stretching, bumping, crimping, and folding
what factors are used to determine setback?
The radius of the Bend and the thickness of the material
what is joggle?
it is the offset formed on a part to allow clearance for a sheet or another meeting part
what is the purpose of lightning holes cut in rib sections?
To reduce weight
how do you determine the total length of a solid rivet for installation
Grip length +1.5 times the diameter
how do you determine the proper material to be used for a repair of an all metal aircraft
Use the same type in thickness of the material that was used in the original structure
What is the single rose spacing in edge distance for protruding head rivets
Edge distance is two times the diameter, spacing is three times the diameter.
describe rivet head marking from A,B,D,AD, and DD rivets
Plain 1000, cross 5056, tit 2024, dimple 2117, and double dash 2017
describe the criteria for replacement of a 2024 rivet with a 2117 rivet for General repairs
for 5/32 or less diameter use the next larger size rivet assuming that spacing and edge distance meet minimum requirements
