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General Oral Questions > Fluid Lines And Fittings > Flashcards

Fluid Lines And Fittings Flashcards

1
Q

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

A

Metal tubing and flexiblehose.

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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 mesured in 1/16th 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 the 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 fittings material 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 overtightened?

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 of flexible hose.

A

(1) Buna-N (2) Neoprene (3) Butyl (4) Ethylene Propylene diene rubber (5) Teflon.

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12
Q

When selecting a flexible hose for use in 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 (hose identification) on a flexible hose?

A

No more than 9” 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 original diameter.

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15
Q

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

A

AN - Have a shoulder.
AC - Do not.

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16
Q

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

A

Sleeve lenght, 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 a flare-type fitting?

A

Flareless fittings don’t have a flare cone and there in no space between the threads and the end of the fitting.

18
Q

What is the effect of over-tightening a flare type 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 grounding to the structure.

20
Q

What are some of the important advantages of TEFLON tubing?

A

Compatible with most fluids, temperature range, low resistance to fluid flow and long shelf 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 into the system.

23
Q

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

A

5 to 8% of its total lenght.

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° fares are used on cars, 35° to 37° in aviation.

General Oral Questions (12 decks)

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