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Questions and Answers
What type of fittings are used in many engine and airframe fluid systems?
What is used in some applications instead of aluminium gaskets?
Which type of fittings provide quick connect/disconnect capability with self-sealing action?
What provides no-spill connection and disconnection in aerospace applications?
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What type of lines are typically joined by a rubber hose with screw-type hose clamps?
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Which feature allows the banjo to rotate freely before the bolt is torqued?
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Which synthetic rubber compound is best suited to carry petroleum products?
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What is the difference in the length between AN and AC sleeves of the same size?
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Which synthetic rubber compound breaks down if used with petroleum products?
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How are AN steel fittings distinguished from AN aluminium fittings?
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What color are the AN 819 aluminium bronze sleeves?
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Which synthetic rubber compound has characteristics of being abrasion resistant and is used with petroleum-based fluids?
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Which synthetic rubber compound is excellent as an inner liner for fluid lines carrying phosphate ester-base hydraulic fluids?
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What angle external flare do AN fittings have?
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Which type of tube fittings have an internal bevel of 24°?
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Which synthetic compound has an extremely broad operating temperature range (-65 °F to 450 °F) and is compatible with nearly every liquid used?
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Which synthetic compound experiences less volumetric expansion than rubber and has an almost limitless shelf and service life?
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How many parts does a fitting consist of?
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What is the purpose of the outer cover of a flexible hose?
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Why is the design of reinforcement layers in a hose considered critical?
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What does a lay line on the outer cover of an aircraft flexible hose typically indicate?
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How does a proper lay line indicate correct hose installation?
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In areas of high heat, how is the outer cover of a flexible hose often designed?
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Which materials are commonly used for reinforcement layers in hoses?
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What type of rubber is used for the inner liner of a high-pressure hose designed to carry Skydrol?
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How is a high-pressure hose distinguished from a medium-pressure hose in terms of the outer appearance?
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What type of fittings cannot be removed and reused once assembled on a hose?
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What is the color of the outer braid of a hose designed to carry Skydrol?
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What is the typical color of a high-pressure hose with a yellow lay line?
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What material is used as reinforcement in the inner liner of a high-pressure hose?
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Study Notes
Fluid Systems Fittings
- Many engine and airframe fluid systems use AN (Army-Navy) or MS (Military Standard) fittings.
- In some applications, copper or stainless steel gaskets are used instead of aluminum gaskets.
Quick Connect/Disconnect Fittings
- Self-sealing fittings provide quick connect/disconnect capability.
Aerospace Applications
- No-spill connections and disconnections are provided by quick disconnect fittings.
Hose Connections
- Rubber hoses with screw-type hose clamps are typically used to join fuel lines.
Banjo Fittings
- The banjo feature allows the banjo to rotate freely before the bolt is torqued.
Synthetic Rubber Compounds
- Nitrile (Buna-N) is best suited to carry petroleum products.
- Neoprene breaks down when used with petroleum products.
- Fluorocarbon (Viton) has an extremely broad operating temperature range (-65 °F to 450 °F) and is compatible with nearly every liquid used.
- Fluorocarbon (Viton) experiences less volumetric expansion than rubber and has an almost limitless shelf and service life.
- Fluorosilicone (FS) is excellent as an inner liner for fluid lines carrying phosphate ester-base hydraulic fluids.
- PTFE (Teflon) is abrasion resistant and is used with petroleum-based fluids.
AN Fittings
- AN fittings have an external flare of 37°.
- AN steel fittings are distinguished from AN aluminum fittings by their color.
- AN 819 aluminum bronze sleeves are silver in color.
Hose Construction
- The outer cover of a flexible hose provides protection from abrasion and damage.
- The design of reinforcement layers in a hose is critical to ensure the hose's strength and flexibility.
- A lay line on the outer cover of an aircraft flexible hose typically indicates the direction of installation.
- A proper lay line indicates correct hose installation.
- In areas of high heat, the outer cover of a flexible hose is often designed with a heat-resistant material.
- Common materials used for reinforcement layers in hoses include Kevlar, fiberglass, and stainless steel.
- A high-pressure hose is distinguished from a medium-pressure hose by its thicker outer cover and more reinforcement layers.
Hose Materials
- The inner liner of a high-pressure hose designed to carry Skydrol is made of fluorosilicone (FS) rubber.
- The outer braid of a hose designed to carry Skydrol is blue in color.
- A high-pressure hose with a yellow lay line is typically yellow in color.
- The inner liner of a high-pressure hose is reinforced with stainless steel or Kevlar.
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Description
Test your knowledge on flared-tube fittings materials and identification, including AN sleeve colors and materials used. Learn about the characteristics of aluminium alloy, steel, and copper base alloys in flared-tube fittings.
