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General Writtens > Fluid Lines and Fittings > Flashcards

Fluid Lines and Fittings Flashcards

1
Q

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.

A

AN-818-8.

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2
Q

Metal tubing fluid lines are sized by wall thickness and…

A

Outside diameter in 1/16 inch increments.

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3
Q

Rolling-type flaring tools are used to flare _______, _______, and _______ tubing.

A

Soft copper, aluminum, and brass.

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4
Q

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 hole 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 of 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
A

3, 1, 6, 2, 5, 4

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5
Q

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

A

By cutting out the damaged area and utilizing a swaged tube fitting to join the tube ends.

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6
Q

What is the advantage of double flare on aluminum tubing?

A

More resistant to damage when the joint is tightened.

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7
Q

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

A

Contracts in length and expands in diameter.

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8
Q

The term “cold flow” is generally associated with…

A

Impressions left in natural or synthetic rubber hose material.

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9
Q

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

A

Black

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10
Q

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
A

1

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11
Q

Flexible lines must be installed with…

A

A slack of 5 to 8 percent of the length.

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12
Q

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 sure a connection should be…

A

52-1/2 inches.

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13
Q

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

A

Providing bends in the tubing.

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14
Q

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?

A

0.606 inch.

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15
Q

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…

A

The possibility of reducing the flare thickness by wiping or ironing during the tightening process.

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16
Q

During installation, MS flawless fittings…

A

Are normally tightened by turning the nut a specified amount, unless the manufacturer lists torque values.

17
Q

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

A

37 degrees.

18
Q

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

A

10 percent of the wall thickness.

19
Q

Flexible hose used in aircraft systems is classified in size according to the…

A

Inside diameter.

20
Q

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?

A

The hose may have developed a set, or have been manufactured with a pre-set shape, and must be supported to maintain its shape.

21
Q

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

A

Appear in the heel of a bend.

22
Q

Which of the following hose materials are compatible with phosphate-ester base hydraulic fluids?

A

Butyl and Teflon.

23
Q

Which tubings have the characteristics (high strength, abrasion resistance) necessary for the use in a high pressure (3000 PSI) hydraulic system for operation of landing gear and flaps?

A

Corrosion-resistant steel annealed or 1/4H.

24
Q

When installing bonded clamps to support metal tubing…

A

Remove paint or anodizing from tube at clamp location.

25
Q

In a metal tubing installation…

A

Tension is undesirable because pressurization will cause it to expand and shift.

26
Q

Which of the following tools is best to use when cutting soft aluminum tubing?

A

Hand operated wheel-type tubing cutter.

27
Q

The primary purpose of providing suitable bends in fluid and pneumatic metal tubings run is to…

A

Prevent excessive stress on the tubing.

28
Q

Which of the following statements is true regarding minimum allowable bend radii for 1.5 inches OD or less aluminum alloy and steel tubing of the same size?

A

The minimum radius for steel is greater than for aluminum.

29
Q

A gas or fluid line marked with the letters PHDAN is…

A

Used to carry a hazardous substance.

30
Q

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

A

Symbols are always black against a white background regardless of line content.

31
Q

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

A

At the sleeve, fitting nut, or tube flare.

32
Q

When installing a castle nut, and the nut castellation does not align with the cotter pin hole in the bolt within the torque range, the acceptable practice is to…

A

Change the nut or washer and try again.

33
Q

Which statement concerning Bernoulli’s principle is true?

A

The pressure of a fluid decreases at points where the velocity of the fluid increases.

34
Q

Which statement is true regarding flattening or tubing in bends?

A

The small diameter of the flattened portion must not be less than 75 percent of the original outside diameter.

35
Q

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

A

Have equivalent flow characteristics.

General Writtens (11 decks)

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