Fluid lines and Fitting
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Questions and Answers

What is the color code for fluid lines carrying fuel?

  • red (correct)
  • blue
  • yellow

    • A 3/8 inch aircraft high pressure flexible hose as compared to 3/8 inch metal tubing used in the same system will

  • have higher flow characteristics.
  • can be interchanged without special approval.
  • have equivalent flow characteristics. (correct)

    • What is the advantage of a double flare on aluminum tubing?

  • Can be applied to any size and wall-thickness of tubing.
  • More resistant to damage when the joint is tightened. (correct)
  • Ease of construction.

    • When presetting flareless fittings on 3/8 inch aluminum alloy tubing, the nut should be turned ______ turn(s) after the ferrule is tight against the presetting tube.

    <p>1 to 1-1/6</p> Signup and view all the answers

    Which statement is true regarding the variety of symbols utilized on the identifying color-code bands that are currently used on aircraft plumbing lines?

    <p>Symbols are always black against a white background regardless of line content.</p> Signup and view all the answers

    Excessive stress on fluid or pneumatic metal tubing caused by expansion and contraction due to temperature changes can best be avoided by

    <p>providing bends in the tubing.</p> Signup and view all the answers

    From the following sequences of steps, indicate the proper order you would use to make a single flare on a piece of tubing:

    1. Place the tube in the proper size hold in the flaring block.
    2. Project the end of the tube slightly from the top of the flaring tool, about the thickness of a dime.
    3. Slip the fitting nut and sleeve on the tube.
    4. Strike the plunger several light blows with a lightweight hammer or mallet and turn the plunger one-half turn after each blow.
    5. Tighten the clamp bar securely to prevent slippage.
    6. Center the plunger or flaring pin over the tube.

    <p>3, 1, 6, 2, 5, 4.</p> Signup and view all the answers

    Which tubings have the characteristics (high strength, abrasion resistance) necessary for use in a high-pressure (3,000 PSI) hydraulic system for operation of landing gear and flaps

    <p>CRES, annealed or 1/4H.</p> Signup and view all the answers

    A scratch or nick in aluminum tubing can be repaired provided it does not

    <p>appear in the heel of a bend.</p> Signup and view all the answers

    A certain amount of slack must be left in a flexible hose during installation because, when under pressure, it

    <p>expands in diameter and shortens in length.</p> Signup and view all the answers

    45 degree flares are used for what kind of fittings?

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

    Metal tubing fluid lines are sized by wall thickness and

    <p>outside diameter in 1/16 inch increments.</p> Signup and view all the answers

    The maximum distance between end fittings to which a straight hose assembly is to be connected is 50 inches. The minimum hose length to make such a connection should be

    <p>52-1/2 inches.</p> Signup and view all the answers

    Which statement is true regarding flattening of tubing in bends?

    <p>Flattening by not more than 25 percent of the original diameter is permissible.</p> Signup and view all the answers

    What is the color of an AN steel flared-tube fitting?

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

    The material specifications for a certain aircraft require that a replacement oil line be fabricated from 3/4-inch 0.072 5052-0 aluminum alloy tubing. What is the inside dimension of this tubing?

    <p>0.606 inch.</p> Signup and view all the answers

    What is the color code for fluid lines carrying fire extinguishing agent?

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

    In most aircraft hydraulic systems, two-piece tube connectors consisting of a sleeve and a nut are used when a tubing flare is required. The use of this type connector eliminates

    <p>the possibility of reducing the flare thickness by wiping or ironing during the tightening process.</p> Signup and view all the answers

    What is an advantage of a double flare on aluminum tubing?

    <p>More resistant to damage when joint is tightened.</p> Signup and view all the answers

    What is the color code for fluid lines carrying hydraulic fluid?

    <p>Blue/Yellow</p> Signup and view all the answers

    When a Teflon hose has been in service for a time, what condition may have occurred and/or what precaution should be taken when it is temporarily removed from the aircraft?

    <p>The hose may have developed a set or been manufactured with a pre-set shape. It must be supported to maintain that shape.</p> Signup and view all the answers

    Flexible lines must be installed with

    <p>5% - 8% slack</p> Signup and view all the answers

    Scratches or nicks on the straight portion of aluminum alloy tubing may be repaired if they are no deeper than

    <p>10 percent of the wall thickness.</p> Signup and view all the answers

    Hydraulic tubing, which is damaged in a localized area to such an extent that repair is necessary, may be repaired

    <p>by cutting out the damaged area and utilizing a swaged tube fitting to join the tube ends.</p> Signup and view all the answers

    In metal tubing installations,

    <p>tension is undesirable because pressurization will cause it to expand and shift.</p> Signup and view all the answers

    The term 'cold flow' is generally associated with

    <p>impressions left in natural or synthetic rubber hose material.</p> Signup and view all the answers

    A certain amount of slack must be left in a flexible hose during installation because, when under pressure, it

    <p>contracts in length and expands in diameter.</p> Signup and view all the answers

    The primary purpose of providing suitable bends in fluid and pneumatic metal tubing runs is to

    <p>prevent excessive stress on the tubing.</p> Signup and view all the answers

    Which of the following statements is/are correct in reference to flare fittings?

    1. AN fittings have an identifying shoulder between the end of the threads and the flare cone.
    2. AC and AN fittings are considered identical except for material composition and identifying colors.
    3. AN fittings are generally interchangeable with AC fittings of compatible material composition.

    <p>1</p> Signup and view all the answers

    Every tubing installation must have at least one bend to

    <p>prevent excess stress on the tubing</p> Signup and view all the answers

    Which coupling nut should be selected for use with 1/2-inch aluminum oil lines which are to be assembled using flared tube ends and standard AN nuts, sleeves, and fittings?

    <p>AN-818-8.</p> Signup and view all the answers

    Flexible lines must be installed with

    <p>a slack of 5 to 8 percent of the length.</p> Signup and view all the answers

    Rolling-type Flaring Tools are used to flare X, X, and X tubing.

    <p>Soft copper, aluminum, brass.</p> Signup and view all the answers

    Which of the following hose materials are compatible with phosphate-ester base hydraulic fluids?1. Butyl.2. Teflon.3. Buna-N.4. Neoprene

    <p>1 and 2.</p> Signup and view all the answers

    To find the inside diameter of rigid tubing, twice the wall thickness must be subtracted from the _______ diameter.

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

    What is the maximum outside diameter of soft aluminum tubing that can be double-flared?

    <p>3/8 inch</p> Signup and view all the answers

    If a flared tube coupling nut is overtightened, where is the tube most likely to be weakened/damaged

    <p>At the sleeve and flare junction.</p> Signup and view all the answers

    High-pressure oxygen is typically carried in a stainless steel line.

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

    Metal tubing fluid lines are sized by wall thickness and

    <p>outside diameter in 1/16 inch increments.</p> Signup and view all the answers

    What process is necessary prior to installing new flareless fittings?

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

    When flaring aluminum tubing for use with AN fittings, the flare angle must be

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

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