First Aid in Aviation Maintenance

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Questions and Answers

What is the primary method of treating minor burns from soldering?

Running cold water over the affected area for at least 5 minutes (correct)

Using a hot water bath to soothe the burn

Applying creams or ointments immediately

Applying ice to the affected area first

What should you do if you get solder or solvent in your eye?

Flush the eye with copious quantities of water (correct)

Apply a dry dressing to the affected eye

Try to remove the solder or solvent with your fingers

Use a hot water bath to flush the eye

Why should you avoid applying creams or ointments to minor burns?

They may cause infection

They may cause an allergic reaction

They can delay the healing process (correct)

They are not necessary for minor burns

What should you do with your soldering iron after use?

Return it to its stand immediately Signup and view all the answers

What is the most common method of heat application for soldering joints in aircraft electrical wiring?

Electrically heated, hand-held soldering iron Signup and view all the answers

Why should you allow joints and components to cool down before touching them?

To prevent burns Signup and view all the answers

What should you do if you need to transport a patient with solvent or solder in their eye?

Place pads on both eyes and transport the patient to medical attention Signup and view all the answers

Why should you not touch the element or tip of a soldering iron unless it is cold?

To prevent burns Signup and view all the answers

What is the primary tool used in soldering operations?

Soldering iron Signup and view all the answers

Which type of soldering iron is prohibited from use on electronic equipment?

Instant heat iron Signup and view all the answers

What is the primary purpose of the thermostat in a thermostatically controlled iron?

To control the tip temperature Signup and view all the answers

What is the characteristic of the temperature at the tip of an instant heat iron?

It is virtually uncontrollable Signup and view all the answers

In which type of soldering iron does the tip heat to its idle temperature and then drop to its working temperature when placed on a connection?

Constant heat iron Signup and view all the answers

What is the main difference between a constant heat iron and a thermostatically controlled iron?

The temperature control mechanism Signup and view all the answers

In which type of setting is a constant heat iron typically used?

Automotive/General Service Equipment (GSE) Signup and view all the answers

What is the primary purpose of a soldering iron?

To solder wires Signup and view all the answers

What is the condition of conductors that cannot be used?

With damaged insulation Signup and view all the answers

What is the characteristic of a good soldered joint?

Bright silvery appearance with smooth fillets Signup and view all the answers

What happens if the solder balled up on the joint?

The joint was not hot enough Signup and view all the answers

What is the term used to describe a solder joint with poor electrical integrity?

Cold joint Signup and view all the answers

What should you do to verify that a soldered component is tightly bonded together?

Wiggle the soldered component Signup and view all the answers

What is a characteristic of a joint with excessive heat?

Greyish, wrinkled appearance Signup and view all the answers

What should be done if a solder joint has any of the rejection criteria?

The joint should be taken apart and the entire soldering operation repeated Signup and view all the answers

What is a sign of insufficient solder in a solder joint?

Partially exposed joint Signup and view all the answers

What is the recommended way to apply flux-core solder?

Exactly at the point between the metal and the soldering iron Signup and view all the answers

What should you do if heavy 'rocking' pressure is necessary while soldering?

Both A and B Signup and view all the answers

How much solder should you use when soldering?

Only the amount necessary for the job Signup and view all the answers

What should you do with the soldering iron when not in use?

Place it in a holder Signup and view all the answers

What should you do to prevent overheating of the soldering iron?

Disconnect the iron when not in use Signup and view all the answers

How should you let the solder joint cool after application?

Let it cool naturally Signup and view all the answers

What should you avoid when working with silver-coated wire?

Wicking during solder application Signup and view all the answers

What happens if you disturb a finished solder joint?

The joint becomes mechanically weak with high electrical resistance Signup and view all the answers

What is the recommended way to remove dross and excess solder droplets from the soldering iron tip?

Passing the tip through a damp cleaning sponge or wiping pad Signup and view all the answers

Why are soldering tips plated with a combination of iron, nickel, and chromium?

To protect the bare metals from oxidizing rapidly Signup and view all the answers

What indicates the need for re-tinning the soldering iron tip?

The tip becoming pitted due to oxidation Signup and view all the answers

Why should an iron tip be loaded with excess solder when not in use?

To prevent oxidation of the tip Signup and view all the answers

What is the purpose of tinning a soldering iron tip?

To enable the tip to readily accept solder Signup and view all the answers

How should the soldering iron tip be inserted into the casing?

Fully inserted and seated firmly against the heating element Signup and view all the answers

What is the recommended treatment for a soldering iron tip after extended use?

Filing the tip smooth and re-tinning Signup and view all the answers

What is the primary material used in manufacturing soldering iron tips?

Copper alloys Signup and view all the answers

Study Notes

First Aid

Burns from soldering are likely to be minor and require immediate treatment by cooling the affected area under gently running cold water for at least 5 minutes
Do not apply creams or ointments to the burn; a dry dressing may be applied to protect the area from dirt
Seek medical attention if needed
To reduce the risk of burns, always return the soldering iron to its stand after use, allow joints and components to cool down before touching them, and never touch the element or tip of a soldering iron unless certain it is cold
If solvent or solder enters the eyes, flush with copious quantities of water, place pads on both eyes, and transport the patient to medical attention

Soldering Tools

Heat Application Methods

The most commonly used method of heat application for soldering joints in aircraft electrical wiring is an electrically heated, hand-held soldering iron

Soldering Irons

Types of soldering irons:
- Instant heat iron: used for general soldering where high heat is required, but generally prohibited from use on electronic equipment
- Constant heat iron: used for general soldering in Automotive/General Service Equipment (GSE) areas where equipment is not heat sensitive
- Thermostatically controlled iron: used for general soldering in Automotive/GSE settings, similar to constant heat iron but with a thermostat to control tip temperature
Soldering iron maintenance:
- Pass the soldering iron tip through a damp cleaning sponge or wipe on a wiping pad to remove surface dross and excess solder from the working surface
- Do not shake or ‘whip’ an iron to get rid of dross or excess solder droplets
- Keep the iron tip clean and loaded with excess solder when not in use

Soldering Iron Tips

Soldering tips are manufactured from various copper alloys chosen for their high thermal conductivity and excellent heat strength
Tips are plated with a combination of iron, nickel, and chromium to protect the bare metals from oxidation and dissolution by molten solder
Tinning (applying solder to the tip after heating) is necessary for a soldering tool tip to readily accept solder
An iron tip should be tinned prior to soldering a component in a circuit
Pitting indicates the need for re-tinning, and the tip should be filed smooth before re-tinning

Application of Heat and Solder

Apply flux-core solder at the exact point between the metal and the soldering iron
Melt the solder on the joint, not the iron
Place the soldering iron firmly against the junction, and do not apply heat to the work any longer than necessary to melt the solder on all parts of the joint
Do not use any more solder than necessary, and do not pile up solder around the joint
Exercise care with silver-coated wire to prevent wicking during solder application

Heat Application Time

Do not apply heat to the work any longer than the time necessary to melt the solder on all parts of the joint

Soldering Iron Holder

When the soldering iron is not in active use, keep it in a holder to protect the operator against burns and the iron against damage

Protection Against Overheating

Do not allow the iron to overheat
Disconnect the iron when it is not in use (between operations), or use a heat-dissipating stand that will keep the iron at a constant temperature

Cooling the Solder Joint

When the solder joint has been made, hold the work firmly in place until the joint has set
Do not disturb the finished work, as this will result in a mechanically weak joint with high electrical resistance
Allow solder joints to cool naturally; do not use liquids or air blasts

Wire Tinning

Wire tinning involves applying solder to the tip of the wire before soldering a component in a circuit

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Description

This quiz covers the basics of first aid treatment for common hazards in aviation maintenance, such as burns and solvent exposure. It's a part of CASA Part 66 training materials.