A very important step in getting connected to the aircraft's fuel tanks is to first a ground wire. This is because the flowing movement of flammable liquids, such as gasoline within a pipe or hose, can build up static electricity. An electrostatic discharge has the risk of igniting fuel vapor.
Grounding ensures electrical continuity between the aircraft and the earth. Static electricity resulting from the flight or the environmental conditions on ground (wind with dust, sand, etc...) is discharged to the earth through the tires.
Ground, or bond, your aircraft by unreeling and connecting the grounding line. This is to deter sparks from static electricity during the fueling process. Attach it to bare metal on the aircraft-the exhaust stack(s) is a good choice. If you've just flown, remember the exhaust will be hot.
It is mandatory to bond the aircraft to the refueling vehicle/device before connecting the refueling hose. One of the aircraft grounding (earthing) points must be used to connect the bonding cable. Depending on the aircraft type, locate the grounding (earthing) points: On the Nose Landing Gear (NLG).
Grounding is essential to creating a safe environment when using high-powered electrical devices. If a device malfunctions and begins drawing a dangerous amount of current, grounding allows the circuit to safely dissipate the excess charge.
In most aircraft, you do this by connecting one end of a heavy cable, or metal grounding strap, to some conveniently located bolt on the engine crankcase. The other end of the grounding strap should terminate on some solid part of the aircraft's firewall structure.
An aircraft requiring modification or repair may be 'grounded' until the necessary work has been completed and the aircraft is once again fit for flight.
For grounded systems, the NEC requires you to perform all of the following: electrical system grounding, electrical equipment grounding, electrical equipment bonding, and bonding of electrically conductive materials. In ungrounded systems, the same actions are required except for electrical system grounding.
General safety procedures
Cabin crew, passengers and other responsible staff should be warned that fuelling will take place and that they must not smoke, or operate electrical equipment or other potential sources of ignition. Operators may permit the use of cellular telephones inside the aircraft during refuelling.
A. Ground airplane and fueling trucks. WARNING: AIPPLANE AND FUEL TRUCK SH0ULD BE PROPERLY GROUNDED BEFORE ANY FUELING OPERATION TO PREVENT THE POSSIBILITY OF FIRE OR EXPLOSION DUE TO DISCHARGE OF STATIC ELECTRICITY.
Grounding and bonding consists of connecting a tank from which a flammable liquid or gas is being discharged to the receiving tank and also to the earth so that any static build up can dissipate into the earth without causing a spark.
The primary risk is unintended ignition of fuel vapour, which can occur by a single spark. A sufficient quantity of fuel vapour to create a high risk of ignition may result from spillage arising from procedural errors, leaks, aircraft tank venting or failure of pressurized fuel lines or their couplings.
Grounding is an important aspect of every electrical distribution system. A properly designed and well maintained grounding system significantly reduces the chance of personnel electrocution, electrical fires, equipment damage and associated downtime.
Do not drag the hose along the leading edge. Next, connect the fueling nozzle grounding cable to the aircraft grounding receptacle and immediately remove the filler cap. After that, insert the fuel nozzle into filler cap and commence fueling which is carried out by the suction method which is provided by the tanker.
Step number one is to always ground the aircraft before you remove the fuel cap. In fact, before you even think about fueling your aircraft yourself, learn the right way to ground it. Fuel passing through the hose builds up static electricity. Ungrounded, the resulting discharge can quickly ruin your day.
Which of the following precautions is most important during refueling operations? Fuel to be used must be appropriately identified.
Always shut the engine off before fueling. Check to ensure that both the fuel dispenser and the equipment are grounded. Be careful not to spill fuel. This creates a safety, health, and environmental hazard.
The three major techniques are system grounding, ground rods and circles, and connecting metal tables and structures to the ground to carry potential electrical current away from users.
Grounding your electrical systems is critical to protect both building occupants and equipment from the danger of high voltage. When a conductive surface, like metal, is not grounded and becomes electrically energized, it can carry sufficient voltage to administer a fatal shock.
What Is Electrical Grounding? Grounding offers excess electricity the most effective and safest route from an appliance back to the ground by way of an electrical panel. Electrical grounding is a backup pathway that is generally only used if there is a fault in the wiring system.
Definition. Ground Effect is the name given to the positive influence on the lifting characteristics of the horizontal surfaces of an aircraft wing when it is close to the ground. This effect is a consequence of the distortion of the airflow below such surfaces attributable to the proximity of the ground.
Grounding or earthing refers to direct skin contact with the surface of the Earth, such as with bare feet or hands, or with various grounding systems.
Description. A Ground Power Unit (GPU) can be either a fixed or mobile unit which can be connected to the electrical system of an aircraft while on the ground to provide either 120V AC or 28V DC power. Ground power units usually consist of a generator powered by a diesel engine but may found in other configurations.