Maintenance Practices M7.9 Flashcards

1
Q

How are tube sizes dertermined

A

External diameter and wall thickness

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2
Q

When is aluminium used for solid tubes

A

Low pressure lines or 1500psi or lower

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3
Q

When manufacturing pipes how would they be tested

A

To 1.5 times system pressure

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4
Q

When installing bonded clamps what must be remembered

A

All surface protection and paint must be removed to ensure good bonding

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5
Q

Aircraft pipe flares are what angle

A

37°

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6
Q

What must you do if there is a slight leak in a joint

A

Do not over tighten. Back off, clean and retorque to ensure nothing is damaged

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7
Q

What tool is preferred to flare pipes

A

Roll type tool 37°

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8
Q

What pipes would you find a double flair

A

Soft aluminium tubing 3/8 diameter or smaller

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9
Q

What is Harrison type suage fitting

A

Well suited for thin walled tubes and vibration resistant

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10
Q

What is a permasuage fitting

A

Permanent and not separable.

Big disadvantage you can’t disassemble

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11
Q

What is done to help reduce stress when bending pipes

A

Lubricate the bending portion

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12
Q

What is used to calculate bends other than simple 90°

A

Offset bend calculator

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13
Q

What must be mindful when replacing aluminium pipes for CRES or titanium if allowed

A

There will be a weight penalty

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14
Q

What is permissible damage in sharp bottom defects in solid pipes

A

5% wall thickness or scrap

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15
Q

What is permissible in round bottom defects

A

10% wall thickness or scrap

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16
Q

How much will flexible hoses reduce by when under pressure

A

2-4%

17
Q

When flexible hoses are manufactured wha is done to compensate for hoses shrinking slightly whilst under pressure

A

They are manufactured 5-8% larger than required

18
Q

What are flexible hoses used for

A

Connecting moving parts to stationary parts

19
Q

What are the only reusable couplings allowed

A

Aeroquip

20
Q

What are lay lines used for

A

To make sure hoses aren’t twisted on installation

21
Q

How often must flexible hoses be supported

A

Every 24 inches minimum

22
Q

If minimum bend radius cannot be met what is permissible to be done

A

You can fit an elbow