What is the problem with a ‘dry joint’ when soldering?
They are fragile and have a high resistance
When arranging the contacts for soldering, in what direction should they be placed in the solder bucket?
Facing upwards
What should not be present on the outside of a soldering bucket?
Excess solder
If, when soldering, the strands aren’t held in position, what can be created?
A dry joint
What are the four types of self-fluxing solder?
Single-core
Tri-core
Perforated-core
Multi-core
What is soft (tin-lead alloy) solder recommended for?
It is the recommended solder for electrical and electronic applications.
What is the purpose of using a flux?
It removes the oxide from the surfaces to be soldered and promotes a good flow of solder in the joint.
What is conducive to a good soldering result?
A well equipped soldering station
What is bonding?
It is the electrical interconnection of metallic parts (normally at earth potential) for the safe distribution of electrical charges and currents.
How is the aircrafts earthing system automatically connected to the ground upon landing?
Via the noise wheel tyre (impregnated with an electrically conductive compound)
What are braided copper or aluminium cords fitted with lugs used for when bonding?
Bonding connections between moving parts or parts subjected to vibration
What should all bonding connections ensure?
They should be properly locked to prevent intermittent contact which may be caused by vibration.
(Intermittent contact is worse than no contact at all)
When installing bonding connections, what must be considered?
Surrounding/adjacent equipment as they must not interfere.
They should also not be excessively tight or slack
Before installing bonding connections to insulating materials, what must be done?
Anodic finishes and/or paint is removed from contacting faces.
What are the checks completed before carrying out bond testing?
- a full scale deflection of the meter is obtained when the two spikes of the 6-foot cable are shorted.
- the meter reads zero when the single spike 60-foot probe is connected
What is the process of solid rivet removal?
Step 1 = File Flat
Step 2 = Centre punch
Step 3 = Drill through the head
Step 4 = Insert drift punch to break off the head
Step 5 = Drive out the river shank whilst supporting the back (bucking bar)
What safety precautions are carried out prior to solid rivet removal?
- Eye protection
- Check what is behind the rivet
- Warn people in the vicinity
- Prevent FOD as far as possible
- Cleaning work area
When lifting as an individual, what is the maximum load that can be lifted?
20kg
Even light loads when individually lifting can cause what type of problem?
It can obscure your vision
What can be damaged if the loads are incorrectly lifted?
The lumbar disks (slipped disks)
What is the correct way to lift a load individually?
- Take a balanced squatting position.
- Legs should be at hip width apart with one foot slightly ahead.
- Load should be held close to the body (head up, chin drawn in to keep the back straight and rigid)
- The load should be raised by thigh muscles and bones. The bone structure should support the load.
When team lifting, who is responsible for the safe completion of the task?
The team leader
What are the things that the team leader should ensure prior to the team lift?
- everyone should understand what the job involved
- path is clear of obstructions
- each member is a similar height and physique
- the weight of the load is evenly distributed
- that he/she has the best all-round view of the area
- all moved equipment is put back to the original position after the move
What does COSHH stand for?
Control of Substances Hazardous to Health
