ATAT 106 Fluid Lines & Fittings

What are the two categories of hydraulic lines?

Rigid tubing & flexible hose

How is a fuel line identified?

Decals identify lines

What should be done to the aircraft when dealing with fuel?

What are three materials used in aircraft rigid tubing?

Aluminium alloy, corrosion resistant steel and titanium alloy

Why would corrosion resistant steel be used over aluminium?

Used in high pressure hydraulic systems (3000 psi +) (i.e landing gear, flaps, brakes, fire zones) Steel lines used where there is a risk of FOD

Can you identify the diameter of rigid tubing from the part number?

Yes

What unit of measurement is rigid tubing measured in?

Sixteenths of an inch

How can you determine the inside diameter of rigid tubing if the part number & will thickness is provided.

Use the outside diameter and subtract the wall thickness from it twice

Can rigid tubing be repaired or fabricated?

Yes

Can rigid tubing be purchased by part number? Why or why not?

Would tube bending be used on high or low pressure lines?

Both because it helps resist shear and tension loads due to thermal chantes in fluids

What is de-burring anf when is it accomplished?

After cutting the tube you must get rid of burrs because it prevents distortion and allows for good flow

What measurements must be maintained following any bend?

The small diameter of the flattened portion must be no less than 75% of the original outside diameter

What is the minimum amount of bends that must be fabricated on rigid tubing?

One

What type of seal is a flared seal?

Mechanical seal

What is the degree of an aviaiton flare

37 degrees

Does the "B" nut have to be torqued?

Yes

Do you always have to carry out a torque calculation installing hydraulic lines?

Yes

What type of sockets are used to install hydraulic lines?

Crows foot

What colour are aluminium fittings?

Blue

What colour are carbon steel footings

Black

Does the material of fittings matter when torqueing fittings?

Yes you need to torque steel fittings more than aluminium

What does an A.N. Bulkhead require to secure it?

Adel clamps

Does the size of the flare matter?

Yes wrong size could leak

What tool can be used to measure the diameter of a flare?

Verneer caliper

Do you torque one side of a tube all entirely before attaching the other side?

No because you won't get a proper seal

What does N.P.T. Stand for

National Pipe Taper

Do you always have to seal pipe threads?

Only if you make a repair where the N.P.T. Is removed

What can be used to seal pipe threads

Teflon tape or sealing compunds

Are there fittings that have both N.P.T. And flared connections on the same fitting?

Yes an A.N. N.P.T

What type of fittings do M.S. make?

Flareless fittings

What type of seal does an M.S. Fitting make

Partial?

What fittings are designed for higher pressure A.N. or M.S.

M.S. Because it's designed for high pressure (3000psi) hydraulic systems

What type of clamps secure lines from vibration?

Adel clamps

What should be installed anytime a hydraulic line has been opened to the atmosphere

Quick disconnect fittings?

What are two categories of flexible lines?

Polytetrafluoroethylene commonly known as Teflon or PTFE

What must the inner line of flex tube be compatible with?

Petroleum fuel and lubrication

What can the reinforcement layer of flexible rubber liner tubing consist of?

PTFE

What are three advantages of teflon flexible lines?

Unaffected by all fluids & inert to acids, non-flammable, does not absorb moisture

How much slack must be in a flex line?

5-8% of the total length

What are the three parts to a flex line?

Inner tube, reinforcement, outer cover matrtials

Does a shoulder assembly have right and left hand threads

Yes right handed fine threads, left handed coarse threads

Is the shoulder assembly ever rotated for line removal and installation?

No DO NOT rotate the shoulder because it will disassemble the flex line

Is the shoulder assembly rotated during the fabrication?

Yes counter clockwise

What is the degeree of the nipple assemble for A.N. Flex fittings?

37 degrees

What's the name of the tool used for the fabrication process of flex lines?

Mandrel

What is the clearance between the shoulder and nipple assembly?

1/32" - 1/16"

What tool is used to set the clearance of the nipple and shoulder?

Feeler guage

ATAT 106 Fluid Lines & Fittings

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