Sheet Metal and Non-Metallic Structures Flashcards
Rivet gauge, or transverse pitch is the distance between the…
centers of rivets in adjacent rows
What is one of the determining factors which permits machine countersinking when flush riveting?
Thickness of the material is greater than the thickness of the rivet.
The length of a rivet to be used to join a sheet of .032-inch and .064-inch aluminum alloy should be equal to…
one and one-half times the rivet diameter plus .096 inch.
What type of bit should be used to drill holes in Plexiglas?
A specially modified twist drill.
The part of a replacement honeycomb core that must line up with the adjacent original is the…?
ribbon direction.
A piece of sheet metal is bent to a certain radius. The curvature of the bend is referred to as the___________?
bend radius.
Parts fabricated from Alclad 2024-T3 aluminum sheet stock must have all…?
Scratches, kinks, tool marks, nicks, etc., must be held to a minimum.
Composite fabric material is considered to be the strongest in what direction?
Warp.
A well-designed rivet joint will subject the rivets to…?
shear loads.
Which procedure is correct when using a reamer to finish a drilled hole to the correct size?
Turn the reamer only in the cutting direction.
(Refer to Figure 1.) Which of the rivets shown will accurately fit the conical depression made by a 100° countersink?
130 degree
Which statement is true regarding a cantilever wing?
No external bracing is needed.
Which statement is true regarding a cantilever wing?
No external bracing is needed
Superficial scars, scratches, surface abrasion, or rain erosion on fiberglass laminates can generally be repaired by applying…?
One or more coats of suitable resin (room-temperature catalyzed) to the surface.
Which rivets should be selected to join two sheets of .032-inch aluminum?
MS20470AD-4-4.
When riveting dissimilar metals together, what precautions must be taken to prevent an electrolytic action?
Place a protective separator between areas of potential electrical difference.
What is the minimum spacing for a single row of aircraft rivets?
Three times the diameter of the rivet shank.
The aluminum alloys used in aircraft construction are usually hardened by which method?
Heat treatment.
If no scratches are visible after transparent plastic enclosure materials have been cleaned, their surfaces should be…?
Covered with a thin coat of wax.
Which statement is true regarding the inspection of a stressed skin metal wing assembly known to have been critically loaded?
If genuine rivet tipping has occurred, groups of consecutive rivet heads will be tipped in the same direction.
Which of the following are generally characteristic of aramid fiber (Kevlar) composites?
- High tensile strength.
- Flexibility.
- Stiffness.
- Corrosive effect in contact with aluminum.
- Ability to conduct electricity.
High Tensile strength and Flexibility
What is indicated by a black ‘smoky’ residue streaming back from some of the rivets on an aircraft?
Fretting corrosion is occurring between the rivets and the skin.
When necessary, what type of cutting fluid is usually acceptable for machining composite laminates?
Water only.
What is the minimum edge distance for aircraft rivets?
The times the diameter of the rivet shank.