Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
26 Cards in this Set
- Front
- Back
- 3rd side (hint)
|
What are three requirements for a repair to a piece of sheet metal aircraft structure? |
A repair must restore lost strength, rigidity, and must not change the aerodynamic shape of the part |
|
|
|
When making a riveted repair to an aircraft sheet metal structure, which should be the stronger, the shear strength of the rivet, or the bearing strength of the sheet metal? |
The bearing strength of the sheet metal |
|
|
|
What kind of stress is in the upper skin of an aircraft wing In flight? |
Compression |
|
|
|
What type of device is a cleco fastener? |
A patented fastener inserted in the rivet holes used to hold the pieces together before they can be riveted |
|
|
|
What is the main function of a throatless shear in an aircraft sheet metal shop? |
It is used to cut mild carbon steel up to 10-gage, and stainless steel up to 12-gage and also used to make irregular curves in the metal |
|
|
|
What is the purpose of a sight line when laying out sheet metal to be bent in a cornice break? |
To guide the jaws of cornice break so that the bend will start at the bend tangent line |
|
|
|
What kind of metal forming is done by a slip roll former? |
Simple curves with large radius |
|
|
|
What kind of metal forming is done by bumping? |
Compound curves in sheet metal |
|
|
|
What must be done to the flanges of an angle for it to be curved? |
Stretch for a convex curve and shrink for a concave curve |
|
|
|
What is meant by bend allowance used in making a bend in a piece of sheet metal? |
It is the amount of the piece of the sheet metal that is actually used up in making the bend of the piece of sheet metal |
|
|
|
What determines the minimum bend radius that can be used with a piece of sheet metal? |
The thickness and hardness of the material being bent |
|
|
|
What is meant by setback when bending a piece of sheet metal in a cornice break? |
It is the distance the jaws of the cornice break must be set back from the mold line to form the bend |
|
|
|
Why are the lightning holes in a sheet metal wing rib flanged? |
To give the rib rigidity |
|
|
|
When hand forming a piece of sheet metal that has a concave curve, should the forming be started in the center of the curve or at its edges? |
At the edges and work inward to the center |
|
|
|
What is meant by joggle in a piece of sheet metal? |
It is a small offset near the edges of a piece of sheet metal that allows for the sheet to overlap another piece of metal |
|
|
|
When drilling stainless steel should the drill be turned fast or slow? |
Slow because of the strength of the steel |
|
|
|
What is the minimum edge distance allowed when installing rivets in a piece of aircraft sheet metal structure? |
Two times the diameter of the rivet |
|
|
|
What is the recommended transverse pitch to use when making a riveted two row splice in a piece of sheet metal? |
3/4 of the pitch of the rivets in the row |
|
|
|
Why should aluminum alloy rivets be driven with as few blows as it's practical? |
Excessive hammering will work- harden the rivets and make them difficult to drive |
|
|
|
What determines whether a piece of sheet metal should be dimpled or countersunk when installing flush rivets |
The thickness of the sheet, |
countersink if the thickness of the sheet is greater than the thickness of the rivet head. dimple if the thickness of the rivet head is greater than the thickness of the sheet |
|
|
What type of metal should be hot dimpled? |
7075-T6, 2024-T81 aluminum alloys and magnesium alloys |
|
|
|
What kind of repair can be made to a small damage of the core material in one face sheet of a piece of aluminum alloy honeycomb structure? |
A potted compound repair |
|
|
|
What special precautions must be taken when repairing a radome? |
Nothing should be done that will affect its electrical transparency or it's aerodynamic strength |
|
|
|
How is the point of a twist drill ground that is to be used for drilling transparent acrylic material? |
The cutting edge should be dubbed off to a zero rake angle, and included angle of the tip should be ground to 140° |
|
|
|
What causes crazing in a piece of transparent acrylic material? |
Uneven stresses in the material usually caused by heat |
|
|
|
What is the purpose of anodizing a piece of aluminum alloy and how is it applied? |
To protect the surface of the aluminum, it's done by forming an oxide film deposited on the surface by electrolytic processes |
|
