Presetting Tool Operation

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Questions and Answers

What is a crucial step to take before tightening tube fittings?

Use a clamp to secure the tube to the airframe

Pull the tubes into place with torque on the nut

Apply a witness mark across the union

Ensure the tube assembly is properly aligned (correct)

What is the purpose of having at least one bend in rigid tubing?

To increase the tube's flexibility

To reduce the tube's vibration

To increase the tube's pressure capacity

To remove stress from the fittings (correct)

What skill is required when fabricating hose assemblies?

Ability to weld metal tubing

Ability to design hose assemblies

Ability to follow step-by-step instructions (correct)

Ability to use power tools

Why is it essential to use clamps to secure tubes?

To support the tube and remove stress from the fittings Signup and view all the answers

What should be checked when inspecting clamps?

All of the above Signup and view all the answers

What is the purpose of applying a witness mark across the union?

To indicate loose nuts Signup and view all the answers

What is the purpose of lubricating the fitting during the pre-setting process?

To reduce friction between the sleeve and tube during the pre-setting process Signup and view all the answers

What is the correct position of the pilot and cutting edge of the sleeve during the pre-setting process?

Towards the tube's end Signup and view all the answers

How should the tube be positioned in the pre-setting tool seat?

Firmly against the bottom of the seat Signup and view all the answers

What is the minimum internal tube diameter requirement?

Equal to the value shown in the table Signup and view all the answers

What should be the condition of the sealing surface of the sleeve after pre-setting?

Smooth and free from scores Signup and view all the answers

What is the correct amount of embedment of the sleeve cutting lip into the tube's outside diameter?

Between 0.003 and 0.008 in. Signup and view all the answers

What is the purpose of the swivel nut or flange?

To secure the nipple to the mating connection in the fluid system Signup and view all the answers

Why is it important not to intermix nipples and sockets from different manufacturers?

Because of unique characteristics and tolerances Signup and view all the answers

What is the purpose of pressure testing fabricated hoses?

To ensure the hose can withstand system pressure Signup and view all the answers

What is the alternative to pressure testing a new purchased hose from an approved vendor?

Operational checking after installation Signup and view all the answers

What is the consequence of a hose assembly failing a pressure test?

It can be very dangerous to personnel and property Signup and view all the answers

How are flared or flareless fittings and nuts identified?

By the colour-coding system Signup and view all the answers

What is the purpose of adding 5%–8% to the determined hose length?

To allow for expansion or contraction from pressure application Signup and view all the answers

What is the purpose of wrapping the hose with masking or plastic electrical tape?

To prevent braid flare-out Signup and view all the answers

How should the hose be cut to the required length?

Making sure it is square, using a cut-off machine Signup and view all the answers

What should be done to the hose after it is cut to the required length?

Blow the hose clean with filtered shop air Signup and view all the answers

What should be done to the hose when screwing it into the socket?

Twist and push the hose anti-clockwise Signup and view all the answers

What is the purpose of the nipple and nut in the hose assembly?

To provide a surface-sealing portion to the hose-to-tube or component Signup and view all the answers

What should be inspected for signs of deterioration in a hose?

The entire hose, including cracks, discoloration, hardening, UV/Heat damage, and corrosion Signup and view all the answers

What action should be taken if a hose is found to be kinked?

Replace the hose assembly Signup and view all the answers

Why is it important to inspect the braid of a hose?

To check for broken wires Signup and view all the answers

What should be checked when inspecting end fittings?

The type and size, corrosion, cleanliness, nicks, scratches, and damage to the finish Signup and view all the answers

What is a common indication of corrosion in a hose with carbon steel wire braid?

A brownish rust coloration penetrating the outer braid Signup and view all the answers

What should be done if a hose is found to be twisted?

Loosen the clamps and swivel nuts, and then straighten the hose by hand Signup and view all the answers

Study Notes

Flareless Fitting Installation

Clamp the pre-setting tool or flareless fitting body in a vice
Slide a nut and then a sleeve onto the tube, ensuring the pilot and cutting edge of the sleeve points towards the end of the tube
Lubricate the fitting, insert the ram, and tap lightly with a hammer or mallet until the upset flare punch contacts the die blocks and the die blocks are set against the stop plate on the bottom
Place the tube end firmly against the bottom of the pre-setting tool seat while slowly screwing the nut onto the tool threads with a wrench until the tube cannot be rotated with thumb and fingers
Tighten the nut to the number of turns specified in the maintenance manual
After pre-setting, unscrew the nut from the pre-setting tool or flareless fitting body; check the sleeve and tube

Sleeve Inspection

The sleeve cutting lip should be embedded into the tube's outside diameter between 0.003 and 0.008 in.
A lip of tube material will be raised under the sleeve pilot
The sleeve should be bowed slightly
It may rotate on the tube and have no lengthwise movement
The sealing surface of the sleeve, which contacts the 24° angle of the fitting body seat, should be smooth, free from scores, and show no lengthwise or circular cracks
The minimum internal tube diameter should not be less than the value shown in the table

Tube Securing to Airframe

Use cushioned P clamps to secure the tube to the airframe
Ensure the tube assembly is properly aligned before tightening the fittings
Do not pull the tubes into place with torque on the nut
Rigid tubing expands and contracts under pressure and is subject to vibration, so it should have at least one bend to remove stress

Hose Assemblies and Fittings

Fabricating hose assemblies requires basic skills and hand tools
Determine the necessary hose length from the table and diagram
Add 5%–8% to allow for expansion or contraction from pressure application
Wrap the circumference of the hose with masking or plastic electrical tape at the cut-off to prevent braid flare-out
Measure the hose to the required length and cut off the required length, making sure it is square, using a cut-off machine
Blow the hose clean with filtered shop air after cutting
Remove the tape and the clamp socket in a vice
Install the hose end fitting in a twisting, pushing motion until the hose bottoms on the socket shoulder

Hose End Fitting Installation

Do not over-tighten a vice on thin-walled lightweight fittings
Assemble the nipple and nut with a standard matching the inside diameter of the hose
Nipples have three configurations for the hose-to-tube or component surface-sealing portion: flared, flareless, and flanged
The socket fits over the outside diameter of the hose and secures one end of the nipple to the hose
The swivel nut or flange secures the other end of the nipple to the mating connection in the fluid system

Pressure Test Stands

All flexible hose manufactured in the shop must be hydraulic or pneumatic pressure tested prior to installation in the aircraft
Fabricated hoses must be tested to 1.5 times system pressure
A new purchased hose from an approved vendor can be operationally checked after installation in the aircraft by using system pressure in lieu of pressure testing

Pre-installation Procedures

Check hose or hose assembly installations carefully to make sure identification bands and protective closures are present as required after proof pressure testing
Ensure proper routing and clamping are mandatory
Look for kinks or twists in the hose
Observe the lay line, if possible
A kinked hose or hose assembly must be replaced
One that is twisted may be relieved by loosening clamps and swivel nuts, and then straightening the hose by hand
Re-torque the swivel nuts and tighten the clamps

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Description

Learn the steps to operate a pre-setting tool, including clamping, sleeve installation, lubrication, and proper tube alignment. This quiz covers the process of using a pre-setting tool to prepare a tube for a flareless fitting.