Windows and Lenses

Question 1

Plastics are divided into 2 main categories: _______________ and _________________

Answer 1

Thermoplastics and Thermosetting

Question 2

____________ are plastics that can be softened by heat and dissolved in various organic solvents

Answer 2

Thermoplastics

Question 3

Thermoplastics can be divided into three categories…:

Answer 3

Cellulose Acetate Plastic

Acrylic Plastice

Polycarbonate Plastics

Question 4

_____________ _____________ _____________ is not commonly used anymore and expands and contracts with heat **Cracks easily**

Answer 4

Cellulose Acetate Plastic

Question 5

___________ _________ are brittle but strong and cheap

Answer 5

Acrylic Plastics

Question 6

What are the three kinds of thermoplastics

Answer 6

Cellulose Acetate Plastic

Acrylic Plastic

Polycarbonate Plastics

Question 7

_________ ________ _________ is not commonly used anymore, expands/contracts easily with heat, tints over time

Answer 7

Cellulose Acetate Plastic

Question 8

_______ ________ are brittle but strong, and cheap

Answer 8

Acrylic Plastics

Question 9

______________ __________ can also be softened by heat and disolved in various organic solvents. Can be bent cold

Answer 9

Polycarbonate plastic

Question 10

________________ ___________ Do not soften very much under heat. Materials are liquid prior to their final form. Once formed and cured, will keep shape

Answer 10

Thermosetting Plastics

Question 11

______________ are used in aircraft windows

Answer 11

Thermoplastics

Question 12

When Storing sheets of plastic:

Answer 12

Store in a cool/dry location

Store on their edge, at 10^o angle

Question 13

ATA___ Is Windows

Answer 13

ATA56

Question 14

ATA__ Airworthiness Limitations

Answer 14

ATA04

Question 15

When assessing damage to windows, what is the most precise tool?

Answer 15

Optical Micrometer

Question 16

_________ is a fine web-like pattern of small scratches, often only detectable by light

Answer 16

Crazing

Question 17

How is crazing caused?

Answer 17

By allowing some passage of moisture, sulphides, atmospheric contamination

Question 18

What are the steps to cleaning windows?

Answer 18

1) Use water & your hand/fingernail
2) Use commercial window cleanser DON’T USE AMMONIA
3) Acrylic window polish

Question 19

Can you use metal/wood drill bits to drill plastic windows?

Answer 19

No

Question 20

What are the conditions for drilling windows?

Answer 20

Drill bit tip angle must be 60-90^o

Cutting edge must be at 0-4^o

Siurface behind cutting edge should be grinded so no friction builds up

Question 21

Should you drill holes bigger or smaller than fasteners?

Answer 21

All holes should be at least 1/3 bigger than the fastener

Question 22

What is this?

Answer 22

Step Drill

Question 23

___________ __________ is caused by working one small spot and not blending the damage removal over a large enough area

Answer 23

Localized Distortion

Question 24

When cutting acrylic plastics, what should you not use?

Answer 24

Reciprocating saw

Question 25

When trimming acrylic plastics, the fine detail work is best accomplished using a _____ \_\_\_\_\_\_\_\_\_

Answer 25

Die Grinder

Question 26

**In the case of a crack, all ends of the crack can be ______ \_\_\_\_\_\_\_\_ with a #30 Drill bit (1/8"). (Unpressurized aircraft)**

Answer 26

Stop Drilled

Question 27

*Generally, the max amount of stop drills is \_\_\_\_\_*

Answer 27

*Two*

Question 28

To strengthen stop drilled crack, drill #40 holes, and lace holes with ________ \_\_\_\_\_\_\_\_\_\_\_\_ . **(Non-Pressurized Aircraft)**

Answer 28

Brass Lockwire

Question 29

More permanent repairs can be made to acrylic plastic using a _____________ \_\_\_\_\_\_\_\_\_\_ such as PS-30

Answer 29

Polymerizable cement