ACM-125 UNIT EXAM

Question 1

List the types of decay: (20)

Answer 1

ACCEPTABLE WITHIN SPECS
1. Grain - Cross
2. Grain - Curly
3. Grain - Interlocked
3. Grain - Wavy
4. Hard knots
5. Mineral Streaks
6. Pin Knot clusters
7. Pitch Pocket

AUTOMATIC REJECTION
1. Checks
2. Compression failure
3. Compression wood
4. Decay
5. Shakes
6. Spike Knots
7. Split

GENERAL
1. Brown Rot
2. Dry rot
3. Heartwood
4. Knot
5. Spiral Grain

Question 2

What is the maximum distance between nails?

Answer 2

1”

Question 3

What should the moisture content of wood be?

Answer 3

8 -16%
Preferably 10 -12%

Question 4

What are the common types of laminate?

Answer 4

1. American Birch
2. Mohogany

Question 5

How does the grains aligned in laminate?
How do the grains run in plywood?

Answer 5

parallel
90°

Question 6

What does compression failure look like?

Answer 6

bucking of fibers that appears as streaks on the surface

Question 7

What is the maximum grain deviation allowed?

Answer 7

1:15

Question 8

Are spike knots reason for automatic rejection?

Answer 8

yes

Question 9

Are pitch pockets reason for automatic rejection?

Answer 9

no

Question 10

Are pin knot clusters reason for automatic rejection?

Answer 10

no

Question 11

Question #15

Answer 11

C

Question 12

What is open assembly time?

Answer 12

allowable time between application of the glue and time joint is assembled.

Question 13

What is closed assembly time?

Answer 13

allowable time between assembling of joint and application of clamping pressure.

Question 14

What is pot time?

Answer 14

useable life of the glue from time it is mixed

Question 15

A properly formed glue joint is accomplished at temperatures at or above _____.

Answer 15

70°

Question 16

What is the minimum tacking pressure for soft wood?

Answer 16

145 psi

Question 17

What area of the wood spar may not be spliced?

Answer 17

1. Engine mounts
2. Landing gear
3. Wing attachment

Question 18

What is the maximum number of splices you can do on a spar?

Answer 18

2

Question 19

What is the maximum material thickness for a patch?

Answer 19

1/10 of an inch

Question 20

Question #21

Answer 20

C

Question 21

Question #22

Answer 21

B