Pipes, Hoses And Springs Flashcards

1
Q

What benefits to higher quality tubing materials bring to a system assembly?

A

Easier to achieve the same operational pressure with reduction of the wall thickness

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2
Q

Where are steel lines used?

A

High pressure
Engine bay
Landing gear

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3
Q

What materials are medium to low pressure lines manufactured from?

A

Aluminium alloys for weight saving

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4
Q

After manufacturing, what process must be undertaken before a repair section is fitted to an aircraft system?

A

Cleaned out internally with compressed air

Proof tested

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5
Q

What criteria must be considered for the determination of minimum bend radius in rigid tubing assemblies?

A

Dependant on material, wall thickness and outer diameter

Lines must be able to connect to the connections exactly matching the axis and be free of tension

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6
Q

How is a tube assembly prepared before a bonded clamp is installed?

A

Ensure any paint or anodising is removed from the line where the clamp is fitted for electrical continuity

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7
Q

What is a bonded clamp?

A

Used to secure metal fuel, oil or hydraulic lines.

Has an electrical lead connected to the aircraft structure to ground the line

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8
Q

What devices are used to secure tube assemblies to aircraft structure?

A

Support clamps and bonded clamps

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9
Q

What is the purpose of the sleeve on a flared fitting?

A

The sleeve provides added strength and supports the tube to prevent vibration concentrating on the flare

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10
Q

What are vehicle and aircraft flare angles?

A

Vehicle - 45 degrees

Aircraft - 37 degrees

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11
Q

How should a leaking flared pipe be inspected?

A

Dismantled
Inspected
Cleaned

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12
Q

What two types of equipment are used to install flares in tubing and which is recommended?

A

Impact
Roll

Recommended - roll

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13
Q

What specification of tubing may double flares be installed?

A

Soft aluminium tubing with an outside diameter of 3/8 in or smaller can be double-flared to provide a stronger connection

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14
Q

Why would a double flare be used?

A

A double flare is smoother than a single flare and provides a better seal. It is more durable and resistant to the shearing effect of torque

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15
Q

What is recommended before commencing a bend using a hand tube bender?

A

Lightly lubricate the bend point

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16
Q

What is medium pressure in a hose rated to?

A

3000 PSI

17
Q

Materials used to reinforce hoses

A
Cotton
Rayon
Polyester fabric 
Carbon-steel wire 
Stainless steel wire braid
18
Q

Why does a hose need slack and how much?

A

Expand in diameter when under pressure

5-8%

19
Q

What are the outer covers of hose assemblies made from?

A

Rubber-impregnated fabric or stainless steel braid

20
Q

What criteria when inspecting a hose prior to installation?

A

Applicability
Length
Cleanliness
Damage

21
Q

Five key requirements for fitting a hose assembly?

A
Not to twist it 
Subjected to minimum flexing during operation 
Supported at least every 24 inches 
Not stretched tightly between fittings 
Minimum bend radius is observed