Fluid Lines

Question 1

Corrosion-resistant steel tubing is used extensively in:

Answer 1

Landing gear
Flaps
Brakes: brakes located outside

Question 2

Metal Tubing is sized by the outside diameters of the tubing

Answer 2

It is measured in 16th’s of an inch.
A number 6 tubing or -6 is 6/16 or 3/8 inch outside diameter.
A number 8 tubing or -8 is 8/16 or 1/2 inch outside diameter.

Question 3

Rigid Fluid Lines:

Answer 3

Aluminum
Steel
Titanium

Question 4

Aluminum alloy 2024-T or 5052-O

Answer 4

used for low or medium pressures, like fuel and oil lines. Occasionally they are used for high-pressure applications, like landing gear and large aircraft flight controls.

Question 5

Although identification marks for steel tubing differ, each usually has:

Answer 5

The manufacturers name or trademark,
The SAE number, and
The physical condition of the metal.

Question 6

Aluminum Alloy 1100 or 3003

Answer 6

for general purpose lines of low or negligible pressure like instrument lines or ventilating conduits

Question 7

Flexible tubing cut with

Answer 7

5-8% slack

Question 8

The double flare can only be used on aluminum tubing of

Answer 8

5052-O or 6061 from 1/8 to 3/8 inch diameter.

Question 9

Swaged

Answer 9

cutting out damage and replacing with fitting

Question 10

The types of hose are normally classified
by the amount of pressure they are designed to withstand
under normal operating conditions: low, medium, and high.

Answer 10

• Low pressure—below 250 psi. Fabric braid
  reinforcement.
• Medium pressure—up to 3,000 psi. One wire braid
  reinforcement. Smaller sizes carry up to 3,000 psi.
  Larger sizes carry pressure up to 1,500 psi.
• High pressure—all sizes up to 3,000 psi operating
  Pressures (steel)