Wood Structures/Fabric Covering/Painting + Finishing

Question 1

The negative aspect of wood structures:

Answer 1

Can rot and mildew

Question 2

Positive aspects of wood structures:

Answer 2

Can support its own weight.
Hardens over time.

Question 3

Where is rot most likely to occur on a wood structure aircraft?

Answer 3

In the lowest points.

Question 4

T/F
Absolutely no rot is allowed on a wooden aircraft structure.

Answer 4

True.
Absolutely none.

Question 5

Ways to detect rot:

Answer 5

Smell first, then visual.
Pierce with knife.

Question 6

Where does the strength of wood lie?

Answer 6

Across the grain.

Question 7

What is the wood by which all other woods’ characteristics are judged?

Answer 7

Sitka spruce is the reference wood.

Question 8

Minimum number of rings allowed per square inch in aircraft wood:

Answer 8

6 rings.

Question 9

Maximum slope of grain deviation in aircraft wood:

Answer 9

1” : 15”

Question 10

Main way that wood structures are held together:

Answer 10

Glue

Question 11

If glue fails what can be done?

Answer 11

Reapply glue.

Question 12

What type of glue is used in wood structure?

Answer 12

Epoxy glue

Question 13

What should be the goal of a glued joint?

Answer 13

To be stronger than the wood itself.

Question 14

T/F
Joined portions of wooden parts should not be sanded.

Answer 14

True.

Question 15

The grain of the different layers of plywood are _______.

Answer 15

Perpendicular to each other.

Question 16

The grain of the different layers of laminated wood are ________.

Answer 16

In the same direction.

Question 17

In which direction should the grain of a wood repair be?

Answer 17

Same direction as the part being repaired.

Question 18

The purpose of any repair is to restore ________.

Answer 18

Strength.
Stiffness.
Shape.

Question 19

What non-destructive method is used to test the deterioration limit of fabric covering?

Answer 19

A maule fabric tester pushed into fabric at a specified pressure.

Question 20

What is the deterioration limit?

Answer 20

No less than 70% of original strength.

Question 21

Two categories of fabric covering:

Answer 21

Organic.
Non-organic.

Question 22

Types of organic fabric:

Answer 22

Cotton.
Linen.

Question 23

Types of non-organic fabric:

Answer 23

Dacron.
Ceconite.
Superflite.
Poly-fiber.

Question 24

Grades of cotton fabric:

Answer 24

Grade A.
Intermediate.
Glider cloth.

Question 25

Material by which all organic fabrics are judged:

Answer 25

Grade A cotton

Question 26

What factors must be considered when choosing the type of fabric?

Answer 26

Wing loading in pounds per square foot. Never exceed speed (Vne)

Question 27

What is used to tighten organic fabric over the structure?

Answer 27

Butyrate dope.

Question 28

What factors must be considered to determine the spacing of fabric lacing?

Answer 28

In or out of prop wash. Never excess velocity.(Vne)

Question 29

What type of knot is most generally used for rib stitching?

Answer 29

Modified Seine knot.

Question 30

How is non-organic fabric tightened on the structure?

Answer 30

Apply cement and filling material followed by heating.

Question 31

Purposes of paint:

Answer 31

Prevents corrosion. Aerodynamically clean. Weather resistant.

Question 32

What must be done to original paint before repainting?

Answer 32

Remove original paint to prevent weight increase.

Question 33

Most common type of primer:

Answer 33

Epoxy primer.

Question 34

What is used as a spot primer?

Answer 34

Zinc chromate.

Question 35

What happens if wash primer is not allowed to cure properly?

Answer 35

Filiform corrosion will form.

Question 36

_____ slows down the rate of evaporation of dope.

Answer 36

Retarder.

Question 37

Used to restore resilience to old dope film and repair ring worming:

Answer 37

Rejuvenator

Question 38

Types of finishing problems:

Answer 38

Poor adhesion. Blushing. Pinholes. Orange peel. Fisheyes. Runs and sags. Dope roping. Ringworms.

Question 39

What dictates spray pattern of a spray gun?

Answer 39

Wing port position. Air pressure.

Question 40

How far from the surface should the spray gun be held?

Answer 40

6”-10”

Question 41

What shape indicates a correct spray pattern?

Answer 41

Long thin oval.

Question 42

Insufficient spray gun air pressure is indicated by what shape spray pattern?

Answer 42

Short, more circular oval.

Question 43

Trade names of fabric made from polyester fibers:

Answer 43

Ceconite. Superflite. Poly-Fiber.

Question 44

3 requirements of wood used in aircraft:

Answer 44

12% moisture content. Min. of 6 rings per inch. Max. of 1:15 slope of grain.

Question 45

Possible wood defects:

Answer 45

Cross grain. Wavy grain. Knots. Pin knot clusters. Pitch pockets. Mineral streaks.

Question 46

Technique of cutting a log to produce planks with vertical grain.

Answer 46

Quartersawing wood.

Question 47

T/F Flat grain is desirable for aircraft wood planks.

Answer 47

False. Vertical grain. Grain that is @45 degrees or more to the wide dimension of the wood plank.

Question 48

A small plate attached to two or more members of a truss structure:

Answer 48

Gusset

Question 49

A joint in a wood structure in which the ends to be joined are cut in a long taper.

Answer 49

Scarf joint

Question 50

What is required by the FAA when re-covering an aircraft?

Answer 50

Form 337 for major repair.

Question 51

What form is required when changing the fabric type on an aircraft?

Answer 51

STC (supplemental type certificate)

Question 52

The fabric tester that actually pierces the fabric during the test:

Answer 52

Seyboth fabric tester

Question 53

Two basic types of dopes:

Answer 53

Nitrate. Butyrate.

Question 54

The material placed over the ribs before lacing:

Answer 54

Reinforcing tape.

Question 55

Material placed and doped over rib lacing:

Answer 55

Surface tape.

Question 56

Technique that prevents fabric raveling and provides additional surface area:

Answer 56

Pinking. (Pinked edges)

Question 57

Major drawback of nitrate dope:

Answer 57

Very flammable

Question 58

Three types of finishing systems:

Answer 58

Acrylic lacquer. Synthetic enamel. Polyurethane. (Most used)

Question 59

First coat of finishing material:

Answer 59

Tack coat

Question 60

Where are the requirements for color and placement of registration numbers found?

Answer 60

FAR Part 45

Question 61

ATA code for placards and markings.

Answer 61

ATA 11

Question 62

Each pass of the spray gun should overlap all but ____ or ____inches of the previous pass.

Answer 62

2, 3