Flared-Tube Fittings Materials and Identification Quiz
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Questions and Answers

What type of fittings are used in many engine and airframe fluid systems?

  • Hose clamps
  • Banjo fittings (correct)
  • Couplings
  • Threaded fittings

    • What is used in some applications instead of aluminium gaskets?

  • O-rings (correct)
  • Couplings
  • Banjo fittings
  • Hose clamps

    • Which type of fittings provide quick connect/disconnect capability with self-sealing action?

  • Quick-disconnect couplings (correct)
  • Hose clamps
  • Banjo fittings
  • Threaded fittings

    • What provides no-spill connection and disconnection in aerospace applications?

    <p>Couplings</p> Signup and view all the answers

    What type of lines are typically joined by a rubber hose with screw-type hose clamps?

    <p>Low-pressure fluid lines</p> Signup and view all the answers

    Which feature allows the banjo to rotate freely before the bolt is torqued?

    <p>Stress-free alignment</p> Signup and view all the answers

    Which synthetic rubber compound is best suited to carry petroleum products?

    <p>Buna-N</p> Signup and view all the answers

    What is the difference in the length between AN and AC sleeves of the same size?

    <p>AN sleeve is longer</p> Signup and view all the answers

    Which synthetic rubber compound breaks down if used with petroleum products?

    <p>Butyl</p> Signup and view all the answers

    How are AN steel fittings distinguished from AN aluminium fittings?

    <p>AN steel fittings are black, and AN aluminium fittings are blue</p> Signup and view all the answers

    What color are the AN 819 aluminium bronze sleeves?

    <p>Cadmium plated</p> Signup and view all the answers

    Which synthetic rubber compound has characteristics of being abrasion resistant and is used with petroleum-based fluids?

    <p>Neoprene</p> Signup and view all the answers

    Which synthetic rubber compound is excellent as an inner liner for fluid lines carrying phosphate ester-base hydraulic fluids?

    <p>Butyl</p> Signup and view all the answers

    What angle external flare do AN fittings have?

    <p>37°</p> Signup and view all the answers

    Which type of tube fittings have an internal bevel of 24°?

    <p>Flareless fittings</p> Signup and view all the answers

    Which synthetic compound has an extremely broad operating temperature range (-65 °F to 450 °F) and is compatible with nearly every liquid used?

    <p>Teflon</p> Signup and view all the answers

    Which synthetic compound experiences less volumetric expansion than rubber and has an almost limitless shelf and service life?

    <p>Teflon</p> Signup and view all the answers

    How many parts does a fitting consist of?

    <p>Three</p> Signup and view all the answers

    What is the purpose of the outer cover of a flexible hose?

    <p>To protect the hose from physical damage</p> Signup and view all the answers

    Why is the design of reinforcement layers in a hose considered critical?

    <p>To minimize dimensional changes when pressure is applied</p> Signup and view all the answers

    What does a lay line on the outer cover of an aircraft flexible hose typically indicate?

    <p>Year and quarter of hose manufacturing</p> Signup and view all the answers

    How does a proper lay line indicate correct hose installation?

    <p>By showing no twists and running straight along the hose</p> Signup and view all the answers

    In areas of high heat, how is the outer cover of a flexible hose often designed?

    <p>With a rubber-impregnated fabric</p> Signup and view all the answers

    Which materials are commonly used for reinforcement layers in hoses?

    <p>Cotton and rayon</p> Signup and view all the answers

    What type of rubber is used for the inner liner of a high-pressure hose designed to carry Skydrol?

    <p>Butyl rubber</p> Signup and view all the answers

    How is a high-pressure hose distinguished from a medium-pressure hose in terms of the outer appearance?

    <p>High-pressure hoses have a smooth outer cover</p> Signup and view all the answers

    What type of fittings cannot be removed and reused once assembled on a hose?

    <p>Crimped fittings</p> Signup and view all the answers

    What is the color of the outer braid of a hose designed to carry Skydrol?

    <p>Green</p> Signup and view all the answers

    What is the typical color of a high-pressure hose with a yellow lay line?

    <p>Black</p> Signup and view all the answers

    What material is used as reinforcement in the inner liner of a high-pressure hose?

    <p>Steel braids</p> Signup and view all the answers

    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.

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