Government bodies continue to focus on the safety of employees and contractors when performing aircraft maintenance. Like many other industries, these workers can be exposed to dangerous energy sources when performing maintenance.

Circuit breakers on an aircraft are commonly located in or near the cockpit and cut local electrical energy to various parts of the aircraft including instrument panels, lighting, heating etc. When maintenance is done on these parts of the aircraft, the maintenance worker can pull the circuit breaker to ensure the electrical current is turned “off”. Locking out the circuit breaker ensures it is not accidentally turned on during maintenance which prevents injury, death and or equipment damage.

When an aircraft is parked in a hangar, ground power is often plugged into the power receptacle to supply electricity and power the aircrafts systems and/or charge the batteries. When an aircraft undergoes maintenance, the batteries are disconnected and locked in the storage compartment. However, ground power can accidentally be supplied to the power receptacle and must be locked out to prevent accidental energisation which could cause injury, death and or equipment damage.