7.1.4 Safe Working Practices Flashcards
What should you never do when handling electrical equipment?
Never handle or operate electrical equipment with wet hands or feet, or in a wet area.
What type of tools should be used when working on aircraft?
Pneumatic tools are preferable whenever they are available.
What should you avoid with electrical wires and cables?
Do not allow electrical wires and cables to dangle over sharp edges.
What should you check for on electrical cables?
Always ensure that electrical cables are not frayed and that they have undamaged insulation.
What should you never do with electrical wires?
Never trail electrical wires through oil, water, or other liquids.
What is required for electrical equipment?
All equipment should have a suitable plug fitted and be either earthed, or where necessary, double insulated.
How often should electrical equipment be checked?
Electrical equipment needs to be checked regularly, and a serviceable label should be attached, with the most recent test date appended.
What type of electrical equipment should be used in hazardous areas?
Only use approved and specially designed explosion proof electrical equipment in hazardous areas, such as fuel tanks.
What are the potential effects of electric shock?
The passage of electric current can cause muscular contractions, respiratory failure, fibrillation of the heart, cardiac arrest, or injury from internal burns.
What factors affect the severity of electric shock injuries?
The nature and severity of injury depends upon the magnitude, duration, and path of the current through the body.
What must be done before working on aircraft electrical systems?
Ensure that external electrical power has been switched off.
What should be done with the aircraft battery before working on electrical systems?
Disconnect the aircraft battery.
What should be placed at external power receptacles of the aircraft?
Place warning signs advising personnel not to apply power.
What should be done with circuit breakers before work?
Pull and tag all relevant circuit breakers prior to work and ensure they are reset afterwards.
What should be checked before applying power to aircraft systems?
Ensure all switches are in the correct position for the system they relate to.
What hazards do compressed gases present?
Compressed gases provide a number of potential dangers to personnel and must always be treated with extreme caution.
What must be done before charging an aircraft system with a compressed gas?
Purge the hose on the gas bottles to discharge contaminants to the atmosphere.
How should pressure be increased when charging aircraft systems?
Increase the pressure in slow increments to ensure that the gas does not become hot.
What should be checked on pressure gauges?
Always check that pressure gauges are within their calibration date.
What is the typical operating pressure for compressed air in workshops?
Compressed air is generally supplied at an operating pressure of approximately 80 psi.
What can happen if compressed air is directed at people?
Foreign objects can be injected and lodged under the skin, or flying particles can cut or bruise the body.
What can happen if compressed air is blown into the eyes?
Foreign particles blown into eyes can cause eye injuries that can lead to a loss of sight.
What can injecting an air bubble into the bloodstream cause?
It can lead to a fatal embolism.
What can happen if air is blown into the mouth?
It can rupture the oesophagus or the lungs.
