When traveling, carrying magnetic devices on board is a matter of great concern.
Carrying magnetic devices not only involves personal needs, but also concerns flight safety and aviation management regulations. This article will discuss in detail whether magnetic devices can be carried on board, as well as the relevant regulations and precautions.
1. Reasons for restrictions on magnetic devices on board
The carrying of magnetic devices is strictly restricted, mainly because they may interfere with the aircraft’s navigation system, communication equipment and other key electronic equipment.
The International Air Transport Association (IATA) lists magnetic materials as Class 9 dangerous goods because weak stray magnetic fields can interfere with the aircraft’s navigation system and control signals, thereby affecting flight safety. For example, magnetic materials loaded near a compass may cause a compass deviation of up to 125 degrees, thereby endangering the safety of the aircraft.
2. Classification and detection of magnetic devices
Not all magnetic devices are absolutely prohibited from being carried on board.
Depending on the strength of their magnetic field and whether they have been properly processed, magnetic devices can be classified into the following categories:
(I) Ordinary magnetic items
Some common magnetic items, such as mobile phones, laptops, small audio equipment, etc., usually do not have a significant impact on the aircraft’s navigation system and can therefore be carried on board. However, if the magnetic field strength of these devices exceeds the specified standard, magnetic testing is required.
（2) Strong magnetic items
Strong magnetic items, such as NdFeB magnets and strong magnets, are generally considered dangerous goods. These items have a higher magnetic field strength and pose a greater risk of interfering with the aircraft’s navigation system and electronic equipment, so they are generally prohibited from being carried on board.
However, if they are properly shielded so that their magnetic field strength meets air transport standards, these items can be transported as cargo by air.
(3) Testing standards for magnetic equipment
According to IATA regulations, if the maximum magnetic field strength measured at 2.1 meters from the object does not exceed 0.159A/m (200nT, i.e. 0.002Gs), the item is not restricted as a magnetic material and can be treated as ordinary cargo.
If the magnetic field strength exceeds this standard, but meets the requirements after proper shielding, it can also be transported as dangerous goods.
3. Precautions for carrying magnetic devices
（1） Understand the regulations in advance
Different airlines may have different regulations for carrying magnetic devices. It is recommended to consult the airline or check the relevant regulations on its official website before purchasing a ticket.
（2）Do a good job of shielding
For strongly magnetic items, proper shielding must be performed to reduce the impact of their magnetic field on the surrounding environment. Common shielding materials include highly permeable materials such as cold-rolled plates, galvanized plates, etc.
(3) Consider checked luggage
If the airline does not allow magnetic devices to be carried on, you can consider transporting them as checked baggage. When checking, you need to ensure that the equipment is fully protected to prevent damage during transportation.
(4) Special circumstances
For some special circumstances, such as scientific research or medical equipment, it may be necessary to apply for permission from the airline or air transport management department in advance.
Summarize
Carrying magnetic devices on board is an issue that needs to be treated with caution.
Although some common magnetic items can be carried on board, strong magnetic items are usually strictly restricted. To ensure flight safety, passengers need to understand the airline’s regulations in advance and take appropriate measures, such as magnetic detection and shielding. Magnetic devices are only allowed to be carried on board if they meet air transportation standards.