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110 Cards in this Set
- Front
- Back
The type of metal most often used in the construction of civilian aircraft is heat treated ___ alloy |
Aluminum |
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Two basic types of sheet metal structure used for aircraft are: |
Monocoque and semimonocoque |
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A repair to an aircraft structure must restore its original: |
Strength, stiffness and shape |
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The five basic stresses encountered by an aircraft structure are: |
Tension Compression Torsion Bending Shear |
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The top of a wing spar, in flight, is subjected to a ___ stress |
Compressive |
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The bottom of a wing spar, in flight, is subjected to a ___ stress |
Tensile |
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A torsional stress is made up of ___ and ___ acting perpendicular to each other |
Compression and tension |
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a properly designed rivet joint is subjected to what types of stresses or loads? |
Tensile and Shear |
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If a properly designed rivet joint fails, the rivet first will ___. |
Shear |
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Aircraft structures are most likely to fail at points where stresses ___ due to abrupt changes in ___ |
Concentrate, cross-sectional area. |
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To prevent a small crack from extending, you may ___-___ it's end. |
Stop-drill |
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Aluminum alloys ___ susceptible to corrosion |
Are |
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2117 |
Copper |
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2024 |
Copper |
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5056 |
Magnesium |
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7075 |
Zinc |
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Commercially pure aluminum is identified by the number ___ |
1XXX |
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Most of aluminum alloy used for aircraft structure is alloy number ___ |
2024 |
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Alclad is ___, that is ___ onto the surface of heat treated aluminum alloys |
Pure aluminum, rolled |
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In order to protect the alloy within an alclad sheet and to prevent creation of potential stress points, the surface of aircraft sheet metal should be protected from ___ and ___ |
Scratches and abrasions |
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When aluminum alloy is heated to its critical temperature and quenched, it is ___ heat-treated |
Solution |
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Artificial aging is another name for ___ heat treatment |
Precipitation |
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Aluminum Alloys may be ___ by annealing |
Softened |
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As fabricated |
- F |
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Annealed |
-O |
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Solution heat treated |
T4 |
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Solution heat treated and cold worked |
T3 |
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Solution heat treated and artificially aged |
T6 |
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Strain Hardened to quarter hard temper |
H12 |
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Strain Hardened to full hard temper |
H18 |
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Magnesium is ___ than aluminum |
Lighter |
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Three drawbacks to the use of magnesium as a structural material are: |
Cracks easily corrodes easily Burns readily |
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Titanium is used in structural areas of jet transports where a high __ to __ ratio is required |
Strength to weight |
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Because of its strength and resistance to corrosion, stainless steel is well suited for ___ temperature applications such as: |
High Firewalls Exhaust systems |
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Aluminum alloy faced honeycomb panels are useful as a structural material because of their: |
High strength Light weight Stiffness |
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Three methods of Corrosion Prevention used on aluminum Alloys are: |
1. An area of electrode potential difference 2. Covering with an impenetrable oxide film 3. Covering with primer and paint |
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Three requirements for the formation of corrosion on aluminum alloy are: |
1 an area of electrode potential difference 2 a conductive pass between these areas 3 an electrolyte covering the surface |
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When using a scale for Sheet Metal layout, you ___ measure from its end |
Should not |
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Scribes ___ be used to mark bend lines because ________. |
Should not The part will crack when it's bent |
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If a lead pencil is used to make marks on turbine engine hot section parts or reciprocating engine exhaust systems, what can happen? |
Carbon infuses into the metal |
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Felt marking pens ___ widely used for sheet metal layout. |
Are |
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A ___ punch is used to locate the center of a rivet hole when using the old skin as a pattern for a new one |
Transfer |
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A ___ punch is commonly used to remove rivets |
Pin |
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A ___ is a power or hand tool that is very useful for making detailed inside cuts |
Nibbler |
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Aviation snips Cuts right |
Green |
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Aviation snips Cuts left |
Red |
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Aviation snipsCuts straight |
Yellow |
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When using a deburring tool, avoid using too much pressure to prevent the hole from becoming ___ |
Countersunk |
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The most commonly used shop tool for cutting sheet metal work is the ___ |
Squaring sheer |
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Three main parts of a twist drill |
Tip body and shank |
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A number ___ drill is used to cut holes for the 1/8 diameter rivets |
30 |
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The ___ break is the most widely used bending machine in aircraft maintenance shops |
Box |
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What color to identify cleco fasteners 3/32 inch |
Silver |
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What color to identify cleco fasteners 1/8 inch |
Copper |
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What color to identify cleco fasteners 5/32 inch |
Black |
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What color to identify cleco fasteners 3/16 inch |
Brass |
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A ___ is used for finding the location of the new rivet holes when joining undrilled sheet metal skins over previously drilled skins |
Hole finder |
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A ___ is used to remove unwanted metal chips produced by drilling from between metal sheets |
Chip chaser |
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Rivet length is measured in increments of ___-inch and rivet diameter are measured in increments of ___-inch |
1/16inch and 1/32inch |
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Identify the head shape of each of these all aluminum alloy rivets AN426 (MS20426) |
Countersunk |
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Identify the head shape of each of these all aluminum alloy rivets AN470 (MS20470) |
Universal |
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Identify the head shape of each of these all aluminum alloy rivets AN430 |
Round |
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Identify the head shape of each of these all aluminum alloy rivets AN442 |
Flat |
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Prior to installing in AN426 rivet, the metal must be ___ or ___ |
Countersunk or dimpled |
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Identify the alloy used in solid aluminum rivets having these head identification characteristics No mark |
1100 |
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Identify the alloy used in solid aluminum rivets having these head identification characteristics Dimple |
2117 |
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Identify the alloy used in solid aluminum rivets having these head identification characteristics Teat or raised dot |
2017 |
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Identify the alloy used in solid aluminum rivets having these head identification characteristics Raised dashes |
2024 |
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Identify the alloy used in solid aluminum rivets having these head identification characteristics Raised cross |
5056 |
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Give the alloy number used for rivets identified by the following code letters A |
1100 |
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Give the alloy number used for rivets identified by the following code letters B |
5056 |
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Give the alloy number used for rivets identified by the following code letters AD |
2117 |
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Give the alloy number used for rivets identified by the following code letters D |
2017 |
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Give the alloy number used for rivets identified by the following code letters DD |
2024 |
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Give the alloy number used for rivets identified by the following code letters E |
7050 |
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Magnesium skin should be Riveted using a rivet identified by the code letter ___ |
B |
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2017 aluminum our way rivets, identify by the code letter D must be ___ before they can be driven. To maintain them in and Daniel condition, they are Quint and immediately stored in a freezer. Or this reason they are commonly called ___ rivets |
Heated Icebox |
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Rivets that can be installed without access to both ends are called ___ rivets |
Blind |
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A(n) ____ is a special type of rivet that leaves a threaded hole for a machine screw after installation |
Rivnut |
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Three commonly used turn-lock fasteners used on cowlings, access panels, etc, are referred to buy their trade names, and are called ____, ____, and ____ fasteners. |
Dzus, airloc and camlock |
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A ___ saw is a portable circular metal cutting saw that can cut out damaged sections of sheet metal |
Kett |
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___ are cutting tools that rough cut small holes and skins, radio chassis, and instrument panels |
Nibblers |
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On a properly driven rivet, the width of the Bucked head must be ___ times the original shank diameter and the height must be ___ times the original shank diameter. |
1.5 .5 |
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For a rivet joint to develop its required strength, no rivet should be installed with its center nearer to the edge of a sheet than ___ rivet diameters |
Two |
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Adjacent rivets in a row should be no closer than ___ diameters, and no further apart than ___ to ___ diameters of the rivet shank. |
Three diameters Ten to twelve diameters |
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The distance between rows of staggered rivets should be ___ of the distance between rivets in a given row. |
75% |
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What size twist drill for these rivet sizes? 3/32 |
#40 |
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What size twist drill for these rivet sizes? 1/8 |
#30 |
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What size twist drill for these rivet sizes? 5/32 |
#21 |
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What size twist drill for these rivet sizes? 3/16 |
#11 |
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The head angle of an MS20426 is ___ degrees |
100 |
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When three sheets of metal are dimpled and stacked to be Riveted together, they should be ___ dimpled |
Coin |
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What type of dimpling is used on magnesium sheets to prevent them from cracking in the dimpling process? ___ dimpling |
Hot |
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An AN470DD6 rivet would be most properly driven with a ___ rivet gun |
One-shot |
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When installing rivets according to the NACA method, the manufactured head is placed on the ___ of the structure. |
Inside |
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Tapping code Bad rivet |
3 taps |
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Tapping code Good rivet |
Two taps |
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Tapping code Drive the rivet some more |
One tap |
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When practical, bends should be made ___ the grain of the metal |
Across |
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The point of intersection of the mold lines of two sides of a bend is called the ___ point |
Mold |
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The distance from the mold point to the bend tangent line is known as the ___ |
Setback |
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For a bend of 90 degrees, the setback is calculated using the formula known as a ___ or ___ factor to find the setback |
K-value or k-factor |
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For a bend of 90 degrees, the setback is calculated using the formula: Setback= __ + __ |
BR (bend radius) + MT (metal thickness) |
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The formula used to determine setback of an angle other than 90 degrees is Setback = ____ |
K (R+T) |
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The amount of material actually involved in the bend is known as the ____ |
Bend allowance |
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The amount of material actually involved in the bend is known as the ____ |
Bend allowance |
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When bending a bulb angle into a convex curve, the flange of the metal with the bulb must be ___ |
Stretched |
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If a piece of metal becomes too hard when it is being bumped into a compound curve, it ___ be annealed to soften it. |
May |
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What is done to lightening holes in a wing rib to add stiffness? They may be ___ |
Flanged |
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In order for sheet metal pieces to be flat against the skin and yet have one flat on top of another, a process called ___ is used. |
Joggling |