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問題一覧
1
Which of the following MIL specs is for “HEAT resistant” acrylic ?
MIL-H-5425
2
Which of the following MIL specs is for REGULAR acrylic ?
MIL-H-6886
3
Which of the following MIL specs is for CRAZE RESISTANT acrylics ?
MIL-H-8184
4
Which of the following is NOT a proper storage procedure for acrylics?
remove plastic or paper covering
5
Bubbling is caused by under heating acrylics ?
False
6
What causes crazing?
under heating acrylic
7
What radius is required when heating acrylic “WITHOUT heat”?
180 times the thickness
8
Network of fine cracks on the surface (micro voids) best describes?
crazing
9
Which of the following describes best practices for heating acrylics
1. follow manufactures recommendations 2. convection oven 3. hang sheets vertically
10
For every 0.010” thickness of acrylic, how long should it remain under heat?
1 minute
11
BEFORE heating acrylic you must ensure it is dust free / dirt free and also?
remove tape and adhesives
12
Acrylic will hold its shape BELOW what temperature ?
180 degrees F
13
Acrylic will return to its original shape if it’s exposed to temperature above?
180 degrees F
14
A simple curve consists of 2 or more bends ?
FALSE
15
Which of the following is NOT a method of creating a compound curve ?
CLAMPS only
16
You should remove all PAPER masking when cutting acrylics?
False
17
Acrylic will heat up when drilling large holes, how can this be prevented ?
lower drill speed
18
Holes are drilled into acrylic slightly oversized because acrylic expands and contracts with TEMPERATURE?
True, acrylic expands and contracts with temperature
19
What must be done to a drill bit that is being used on ACRYLICS ?
cutting edge reduced to “ZERO rake angle”
20
You can finish trimming acrylics by “sanding or file”?
True
21
Cementing is joining 2 materials to form a structure ?
True
22
A polymerizable cement is a 3 part adhesive containing “a catalyst, monomer-polymer & accelerator“
FALSE
23
Pressurized aircraft windows CAN be repaired as long as it’s a “permanent repair”?
False
24
SOAKING and GLUEING are two methods used to perform cementing?
True
25
Stop drilling a crack is an example of ?
minor repair
26
What are two examples of temporary repairs?
lacing and screws
27
Any permanent repair MUST NOT affect the airworthiness of the aircraft, cause optical distortion, impede pilots vision ?
True
28
Requirements for a surface patch
1. round all corners 2. bevel all edges 3. curve to match window shape
29
Damage limits for windows can be found in what manual?
AMM, ATA 56
30
How can you remove saw marks after cutting a window to size?
buffing edges
31
When installing a new window you must remove ALL plastic and paper coverings ?
FALSE, don’t remove all paper and plastic coverings
32
When installing a new window you must allow space for ?
thermal expansion and contraction
33
When cutting acrylics what type of saw blade should you use?
fine tooth
34
Two examples of permanent repairs are surface or plug patches?
True, both surface and plug patches for permanent repairs
35
Storage requirements for acrylics
1. keeping cool dry place, away from heat / sunlight 2. store sheets upright, 10 degrees vertical angle 3. keep paper or plastic masking intact on sheet 4. cover against dust 5. prevent contact with solvents / paint fumes
36
What happens when heat is applied to acrylic ?
1. becomes pliable with heat 2. can be moulded into any shape
37
What damage can be caused by overheating acrylic during forming process?
bubbles
38
damage to acrylic caused by “UNDER heating” acrylic
crazing
39
Can you form acrylic without heat? What are the limitations if so?
1. can be cold molded 2. radius must be 180 times the thickness
40
What is crazing?
1. the phenomenon that produces network of fine cracks on surface of material 2. can occur in regions of cold and high hydrostatic tension
41
What must be done PRIOR to heating acrylic ?
1. remove all tape and adhesive 2. ensure acrylic is dust free 3. wash with clean soapy water 4. rinse and dry
42
What gloves should be worn when handling acrylic?
wear cotton gloves to prevent finger prints, hot acrylic is soft
43
What is a simple curve?
1. has ONE bend 2. after heating place acrylic over mould 3. clamp ends to prevent curling
44
What is a compound curve?
1. more than one curve 2. methods include; stretching, male and female dies then vacuum 3. vacuum with a female die
45
Paper masking should be left on when cutting acrylic?
true , leave paper on
46
How much larger should you cut acrylic to the desired size?
1/16ths larger
47
Why must you secure acrylic plastic to a solid surface when drilling large holes?
1. prevents cracking as bit exits plastic 2. safety
48
What is polymerizable cement?
2 parts - • a “catalyst” is added to “monomer-polymer” Promotes quick hardening
49
How is method 1- soaking performed?
1. Mask off area not to be soaked 2. Soak one part for about 10 minutes or until sort (cushion) 3. Press the soaked surface against the mating dry surface 4. Allow to set (about 1⁄2 minute) 5. Apply pressure to remove air bubbles in the joint
50
How is method 2- gluing performed?
1. Used when soaking is not convenient 2. Soak shaving of acrylic with ethylene dichloride 3. Mix shaving and ethylene to a thick syrup of glue consistency 4. Spread on surface to be adhered Join the components and let set for a few seconds 5. Apply pressure to remove air and let the two surfaces melt together