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General A&P FAA > Fluid Lines and Fittings > Flashcards

Fluid Lines and Fittings Flashcards

1
Q

The size of rigid tubing is determined by

A

Outside diameter

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2
Q

The outside diameter of rigid tubing is in increments of

A

1/16th of an inch

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3
Q

A -4 “B” nut has an outside diameter of:

A

4/16’’

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4
Q

A -10 “B” nut has an outside diameter of:

A

10/16’’

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5
Q

The two sizing considerations for rigid tubing are:

A
  1. Outside diameter

2. Wall thickness

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6
Q

Rigid tubing wall thickness is given in increments of:

A

thousandths of an inch

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7
Q

The method of finding the inside diameter of rigid tubing is to:

A

Subtracting twice the wall thickness from the outside diameter

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8
Q

When cutting a new piece of rigid tubing, you should ALWAYS cut it approximately ______ % (shorter or longer) than the tube being replaced.

A

10% longer

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9
Q

Why should the rigid tubing replacement be cut 10% longer than original?

A

To allow for margin of error for bending

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10
Q

What is the preferred method for rigid tube cutting?

A

circular tube cutter

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11
Q

To start cutting a rigid tube, mark the tube with

A

a felt tip maker

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12
Q

The finishing two steps in cutting a rigid tube with a circular tube cutter

A
  1. Deburr

2. Blow out with compressed air to remove chips

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13
Q

When bending lines for a repair, with complex curves and bends, you must produce bends that are ____% of

A

75% of the original tube diamter

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14
Q

What are the 3 types of rigid tube connections?

A
  1. Single/ Double flared connectors
  2. Flareless connectors
  3. Hose/clamps over a beaded tube
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15
Q

The type of fittings/ connectors used for fluid lines depends on 3 things:

A
  1. Pressure range
  2. Material being used
  3. Routing
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16
Q

A flared tube fitting consist of what 2 parts?

A
  1. B-nut

2. Sleeve

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17
Q

What is the advantage to using a B-nut and sleeve?

A

Protects the flare from damage as the nut is tightened

18
Q

Two differences between AC and AN flared tube fittings

A
  1. AN fitting has a shoulder between the threads and cone, AC does not
  2. AN is longer for the same size
19
Q

Color of AN flared tube fitting

A

Blue or Black

20
Q

Color of AC flared tube fitting

A

Gray or yellow

21
Q

Angle of the AC and AN flared tube fittings

A

35 degrees and 37 degrees respectively

22
Q

Blue AN flared tube is made of:

A

Aluminium

23
Q

Black AN flared tube fitting is made of:

A

Steel

24
Q

The step necessary prior to installing a flareless fitting is called:

A

Presetting

25
Q

What is presetting?

A

Applying enough pressure to the sleeve to cause it to cut into the outside of the tube

26
Q

Before beading, what should you do to the part of the tube that is ready to be beaded?

A

Lubricate with oil

27
Q

Fuel lines should be secured via

A

bonded line support clamps

28
Q

Scratches or nicks in aluminium tubing are repairable as long as they are

A

no deeper than 10% of wall thickness and not in the heel of the bend

29
Q

Dents in aluminium tubing are serviceable as long as they are

A

less than 20% of the tube diameter and not in the heel of the bend

30
Q

Lines that carry fuel are labeled :

A

FLAM

31
Q

Lines that carry generally dangerous fluids are labeled:

A

PHDAN

32
Q

Why would you use a bullet or a slug for a rigid tube?

A

To repair a small dent

33
Q

The 4 materials used for construction of the inner liner of flexible tubes:

A
  1. Buna-N
  2. Neoprene
  3. Butyl
  4. Teflon
34
Q

Which material is most suitable for the use of Skydrol?

A

Butyl

35
Q

What is important with in regards to servicing teflon hoses

A

Teflon “takes a set” and becomes rigid,

So DON”T bend it when you remove it

36
Q

The laylines are typically which 3 colors?

A
  1. red
  2. white
  3. yellow
37
Q

Medium pressure hoses are used for pressure up to:

A

3000 psi

38
Q

The size of flexible lines is determined by:

A

inner diameter

39
Q

The inner diameter of a flexible line is given in increments of:

A

1/16’’

40
Q

Flexible lines must have between ____ and ____ slack to allow for

A

5-8% slack to allow for dimensional changes

41
Q

The final step in a flexible hose fabrication is to:

A

clean the new hose assembly

General A&P FAA (26 decks)

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