Term
| How may a bonded metal structure be repaired? |
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Definition
Can be repaired using mechanical fasteners (rivets & bolts)
Complete job by filling with epoxy filler, sanding, and painting |
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Term
| Processes for hot forming plastics. |
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Definition
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Term
| When a manufacturer’s maintenance manual requires a plastic window to be installed with rivets, what must be used with the rivets to prevent excessive tightening of the frames to the plastic? |
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Definition
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Term
| If an aircraft’s transparent plastic enclosures exhibit fine cracks which may extend in a network over or under the surface or through the plastic, the plastic is said to be |
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Definition
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Term
| What are the two general classifications of clear plastic used in aircraft, and which is more common? |
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Definition
Cellulose Acetates
Acrylics |
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Term
| Describe the preparation of mounting holes for plastics. |
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Definition
| ⅛ in larger than bolt or screw |
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Term
| What is a thermosetting plastic? |
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Definition
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Term
| How can the technician tell the difference between acrylic and cellulose plastics without damaging them? |
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Definition
Cellulose is yellow
Acrylics are clear |
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Term
| What are the two types of matrices? Briefly describe them |
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Definition
resin matrix - uses resin + hardener
metal matrix |
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Term
| What are the parts of a weave and what is the function of each of these parts? |
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Definition
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Term
| What are the most common fiber reinforcing advanced composite materials? |
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Definition
Fiberglass
Kevlar
Carbon Fiber |
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Term
| Why is warp orientation important? |
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Definition
| strength (match aircraft strength orientation) |
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Term
| In what document will the aviation maintenance technician find approved composite repair criteria? |
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Definition
| Aircraft structural repair manual |
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Term
| Where may the technician find information related to potential hazards of composite materials? |
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Definition
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Term
| What is a bonded structure? |
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Definition
| structure held together with resin or glue instead of fasteners |
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Term
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Definition
| Lifespan after a resin is mixed with a hardener |
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Term
| What type of gloves should be worn when working with composite materials? |
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Definition
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Term
| What are the two common types of Fiberglass reinforcing material? |
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Definition
"E" glass - High Resistivity
"S" glass - Structural |
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Term
| List two disadvantages of Aramid fiber reinforcing material. |
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Definition
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Term
| List 2 properties of Carbon/Graphite reinforcing material |
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Definition
Non-Flammable
High Stiffness
High Strength |
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Term
| What is a "catalyzed resin?" |
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Definition
| Resin with the hardener added |
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Term
| Which filler material is added to epoxy resin to add strength? |
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Definition
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Term
| List 3 advantages of "Pre-Preg" composite materials |
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Definition
Proper amount of resin
No distorting of fabric
Time saving |
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Term
| How can the ribbon direction of a nomex honeycomb core be determined? |
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Definition
| Will only tear in the ribbon direction |
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Term
| What type of fabric weave pattern has uniform strength in both directions? |
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Definition
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Term
| list 2 methods of lightning protection for composite structures |
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Definition
Aluminum wires woven into top layer of composite fabric
Fine aluminum screen may be laminated under the top layer of fabric |
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Term
| What are the two curing methods for composite materials and which of the two is the most widely used method? |
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Definition
Heat Curing (most used)
Room temp cure |
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Term
| Explain the differences between "Step Curing" and " Ramp & Soak Curing" |
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Definition
Step up is manually stepping up the temperature by a tech in intervals of a set time
Ramp is done automatically by a machine and slowly increases the temp steadily |
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Term
| What is the most effective method of applying pressure to a composite repair? |
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Definition
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Term
| What is the purpose of applying a "Peel Ply" material to a repair? |
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Definition
| Transfer excess resin to the bleeder material without sticking to the part |
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Term
| How do most manufactures of epoxy resin express the ratio of resin to hardener? |
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Definition
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Term
| What is the purpose of "Bleeder Material"? |
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Definition
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Term
| What is the purpose of "Non-Perforated Release Material"? |
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Definition
| to keep resin from passing into the breather and into the vacuum tube |
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Term
| Why can carbon fiber material NOT be bonded to aluminum? |
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Definition
| Highly corrosive when bonded to aluminum |
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Term
| What is the purpose of a ring test? |
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Definition
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Term
| What is a composite matrix and what is its primary function? |
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Definition
| Resin - Bonding substance |
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Term
| What type of damage can be repaired with resin and microballoons? |
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Definition
| Core damage (joins core materials) |
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Term
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Definition
| STANDARD PRACTICES AND STRUCTURES - GENERAL |
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Term
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Definition
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Definition
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