Shop Practices - Fluid Lines And Fittings

Front 1

What is the angle of the flare for an Aircraft fitting?

Back 1

37 degrees

Front 2

What is the angle of the flare of an automotive fitting?

Back 2

45 degrees

Front 3

What materials are aviation solid fluid lines generally made of?

Back 3

Aluminum Alloys, Stainless Steel (CRES - "Corrosion Resistant Steel")

Front 4

What pressure range is considered to be a "Low Pressure" system?

Back 4

BELOW 1,000 PSI

Front 5

What pressure range is considered to be a "Medium Pressure" system?

Back 5

1,000 to 1,500 PSI

Front 6

What pressure range is considered to be a "High Pressure" system?

Back 6

ABOVE 1,500 PSI

Front 7

What is 2024 Aluminum, and what does the first '2' mean?

Back 7

2024 Aluminum is sheet metal commonly used for aircraft skin. It has the strength of steel at half the weight. It is also called "Alclad."

The '2' at the beginning of the number stands for "copper," as this is a copper-aluminum alloy.

Front 8

What is 5052-O Aluminum, and what does the "O" mean? What does the '5' at the start of the number signify?

Back 8

5052-O is a very common Aluminum alloy used for solid fluid lines in Medium Pressure systems in aircraft.

The "O" means the material is in its "annealed" state, which means it can be bent and shaped without cracking.

The first '5' signifies "Magnesium," as this is a magnesium-aluminum alloy.

Front 9

What increments are used for ridgid tubing sizes? Given your answer, what size would -4 tubing be?

Back 9

1/16 in increment

-4 tubing would be 4/16 or 1/4".

Front 10

What type of material is used for ridgid fluid lines in High Pressure systems?

Back 10

Stainless Steel

Front 11

How much of the wall thickness of a ridgid fluid line can be damaged before it must be replaced?

Back 11

10% of the wall thickness

Front 12

What are aviation ridgid fluid fittings called, and what does it mean if they are blue? If they are Black?

Back 12

They are called "AN Fittings."

Blue means it is made of Aluminum

Black means it is made of Steel

Front 13

What is the maximum allowable Offset of two beaded fluid lines being clamped together? What is the maximum allowable Angular Deviation between them?

Back 13

Max Offset: 1/16 in.

Max Angular Deviation: 3 degrees

Front 14

Given a Tube Outer Diameter of 1/8" - 3/16", what is the maxumum distance between support clamps?

Back 14

9 inches

Front 15

Given a Tube Outer Diameter of 1/4" - 5/16", what is the maxumum distance between support clamps?

Back 15

12 inches

Front 16

Given a Tube Outer Diameter of 3/8" - 1/2", what is the maxumum distance between support clamps?

Back 16

16 inches

Front 17

Given a Tube Outer Diameter of 5/8" - 3/4", what is the maxumum distance between support clamps?

Back 17

22 inches

Front 18

Given a Tube Outer Diameter of 1" - 1-1/4", what is the maxumum distance between support clamps?

Back 18

30 inches

Front 19

Given a Tube Outer Diameter of 1-1/2 - 2", what is the maxumum distance between support clamps?

Back 19

40 inches

Front 20

What type of Aluminum is used in Low Pressure fluid system ridgid lines?

Back 20

1100-H14 (half-hard)
or
3003-H14 (half-hard)

Front 21

What designation series is given to "commercially pure" Aluminum?

Back 21

1100 series

Front 22

What type of Aluminum is used for Medium Pressure ridgid fluid lines?

Back 22

5052-O Aluminum (magnesium alloy)

Front 23

2024-T Aluminum is occasionally used in aircraft fluid lines. Why is this? Why is it not used more often?

Back 23

It is used occasionally because of its higher strength.

It is not used more often because it is not as flexible and therefore harder to bend and flare without cracking.

Front 24

Describe Mil Spec 5606 Hydraulic fluid (color, base)

Back 24

Red colored, Petroleum based

Front 25

Describe SKYDROL (color, base)

Back 25

Light Purple in color, Synthetic

Front 26

What are the four materials most commonly used for flexible tubing Inner Liners?

Back 26

1) Neoprene
2) Buna-N
3) Butyl
4) Teflon

Front 27

Which Inner Tube Liner materials are safe for use with petroleum-based hydraulic fluids?

Back 27

1) Neoprene
2) Buna-N
3) Teflon

Front 28

Which Inner Tube Material is safe for use with Synthetic SKYDROL?

Back 28

1) Butyl
2) Teflon

Front 29

What happens if you use 5056 Hydraulic Fluid in Butyl hose lines?

Back 29

They will break down and leak because they are made using petroleum.

Front 30

What fluid lines are red?

Back 30

Fuel

Front 31

Which fluid lines are red and grey?

Back 31

Water Injection

Front 32

What type of lines are brown and orange?

Back 32

Electrical Conduit

Front 33

What type of lines are orange?

Back 33

Compressed Gas

Front 34

Which lines are orange and grey?

Back 34

Instrument Air

Front 35

Which lines are orange and blue?

Back 35

Pneumatic

Front 36

Which lines are blue?

Back 36

Coolant

Front 37

What does a line warning symbol look like?

Back 37

Front 38

Which lines are blue and yellow?

Back 38

Hydraulic

Front 39

Which fluid lines are yellow?

Back 39

Lubrication

Front 40

Which lines are green?

Back 40

Breathing Oxygen

Front 41

Which lines are grey?

Back 41

De-icing

Front 42

Which lines are brown?

Back 42

Fire Protection

Front 43

Which lines are brown and grey?

Back 43

Air Condition

Front 44

Which lines are white and say "drain" on them?

Back 44

Drains

Front 45

How much of the total diameter of a ridgid fluid line can be Dented before the piece should be discarded?

Back 45

20%