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A & P Orals - General > Fluid Lines and Fittings > Flashcards

Fluid Lines and Fittings Flashcards

1
Q

What two general types of fluid lines are commonly used in aircraft plumbing?

A

Metal tubing and flexible hose

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2
Q

How is metal tubing classified in size?

A

By the outside diameter in 1/16 inch increments and wall thickness

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3
Q

How are flexible hose sizes designated?

A

By the internal diameter measured in 1/16 inch increments

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4
Q

What caution must be observed when deburring the end of tubing after cutting?

A

Wall thickness is not fractured or reduced in size

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5
Q

Name two kinds of flares commonly used in aircraft plumbing systems

A

The single flare and double flare

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6
Q

Name the parts of a military standard flareless tube fitting

A

Body, sleeve and nut

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7
Q

What type of fittings and materials should be used with stainless steel tubing?

A

Stainless steel fittings

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8
Q

What is the purpose of a sleeve on a flared tube connection?

A

The nut and sleeve together when tightened will draw the sleeve and tubing flare tightly against the male fitting to form the seal.

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9
Q

What happens to a flareless tube fitting when it is over tightened?

A

The nut drives the cutting edge of the sleeve deeply into the tube, causing the tube to be weakened

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10
Q

What are the identification markings usually found on flexible rubber hose?

A

A lay line, hose size, date of manufacture, pressure and temperature limits

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11
Q

Name at least two synthetic materials commonly used in the manufacture a flexible hose

A

Buna-N, Neoprene, Butyl, Ethylene Propylene Diene Rubber, Teflon

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12
Q

When selecting a flexible hose for using a phosphate ester based hydraulic fluid (Skydrol) system, the hose should be made of which synthetic rubber compound?

A

Butyl

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13
Q

What is the maximum interval for repeating the required markings on a flexible hose?

A

No more than 9 inches along the length of the hose

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14
Q

What percentage of flattening is allowed when bending metal tubing?

A

Do not exceed 75% of the original diameter

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15
Q

How can you determine if a fitting in an AN type rather than a AC type?

A

AN - Have a shoulder
AC - Do not have shoulder

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16
Q

What is the most significant differences between AN and AC fittings?

A

sleeve length, thread pitch and the shoulder between the threads and the flare cone on AN fittings

17
Q

How do you tell a flareless fittings from flare-type fitting?

A

Flareless fittings do not have a flare cone, and there is no space between the threads and the end of the fitting

18
Q

What is the effect of overtightening a flare tight fitting?

A

The sealing surface may be damaged or the flare cut off

19
Q

In addition to being securely clamped, what is an additional requirement for installing metal fuel, oil, and hydraulic lines?

A

The lines must be electrically grounded to the structure

20
Q

What are some of the most important advantages of Teflon tubing?

A

Compatible with most fluids, temperature range, low resistance to fluid flow and long shelf life and service life

21
Q

Describe the operation of quick disconnect couplings

A

Each half has a valve that is held open when coupled and is spring loaded closed when disconnected

22
Q

Why are quick disconnect fittings used?

A

Quick means to connect or disconnect a fluid line without loss of fluid and entrance of air to the system

23
Q

When fabricating a flexible hose, what percent of the total length must be allowed for freedom of movement under pressure?

A

5 to 8% of its total length

24
Q

How can you tell that a flexible hose has been installed in a twisted position?

A

A twisted lay line indicates an incorrect installation

25
Q

Name at least two considerations when installing flexible hose assemblies

A

Slack, flexing, twisting, bending, clearance and clamps

26
Q

Scratches and nicks may be repaired if they are less than what percent of the wall thickness

A

10%

27
Q

Flexible hoses should be clamped at least every how many inches?

A

24 inches

28
Q

What is the difference between flare angles for aviation and automotive flares?

A

45° flares are used on cars, 35° to 37° are used in Aviation

A & P Orals - General (12 decks)

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