微弱的杂散磁场对飞机的导航系统和控制信号均有干扰，国际航空运输协会IATA将磁性货物列为第9类危险品，在收取货运时必须加以限制。对带有磁性物质的空运货物都需要进行磁性检测，以便保证飞机的正常飞行。
Why do electronic products need to be magnetically inspected before they are shipped by air? Because the weak stray magnetic field interferes with the aircraft's navigation system and control signals, the International Air Transport Association IATA classifies magnetic cargo as Category 9 dangerous goods, which must be restricted when collecting cargo. Magnetic testing is required for air cargo with magnetic materials in order to ensure the normal flight of the aircraft.
空运货物磁性检测技术要求根据IATA DGR相关条款的规定：为航空运输而包装好的任何物质，如果距包装件外表面任一点2.1m (7ft)处最大磁场强度低於0.159A/m(200nT)，则该物品不作为磁性物质受到限制，可以作为普通货物收运。
The technical requirements for magnetic detection of air cargo are in accordance with the relevant provisions of IATA DGR: any substance packaged for air transportation, if the maximum magnetic field strength at any point 2.1m (7ft) from the outer surface of the package is less than 0.159A/m(200nT) , The article is not restricted as a magnetic substance and can be accepted and transported as a general cargo.
需要磁性检测的货物
Goods that require magnetic inspection
货物需要做磁检的包含磁铁、磁块、磁条等一系列磁性材料制造的产品。例如音响、麦克风等包含电机货或者带有磁性的都需要做磁检。
The goods that need to be magnetically inspected include products made of a series of magnetic materials such as magnets, magnetic blocks, and magnetic strips. For example, speakers, microphones, etc., which contain motors or are magnetic, require magnetic inspection.
(1) 磁性材料: 磁体,磁铁,磁钢,磁钉,磁头,磁条,磁片,磁块,铁氧体磁芯,铝镍钴,电磁铁,磁性流体密封圈,铁氧体,断油电磁铁,稀土永磁体（马达转子）。
(1) Magnetic materials: magnets, magnets, magnetic steel, magnetic nails, magnetic heads, magnetic strips, magnetic sheets, magnetic blocks, ferrite cores, alnico, electromagnets, magnetic fluid seals, ferrites, broken Oil electromagnet, rare earth permanent magnet (motor rotor).
(2) 音响器材: 扬声器，喇叭，喇叭音响/音箱，多媒体音箱，音响，CD，收录机，迷你音响组合，扬声器附件，话筒，汽车喇叭，麦克风，受话器，蜂鸣器，消声器，放映器 讯响器，VCD，DVD。
(2) Audio equipment: speakers, horns, horn audio/speakers, multimedia speakers, audio, CD, radio cassette recorder, mini audio combination, speaker accessories, microphones, car horns, microphones, receivers, buzzers, mufflers, projectors Maker, VCD, DVD.
(3)其他: 电吹风,电视机,手机,电机,电机配件,玩具磁贴,磁性玩具零件,磁石加工品,磁性健康枕,磁保健品，指南针,汽车充气泵,驱动器,减速器,旋转件,电感器元件,磁线圈感测器,电动齿轮器,接力器,万用表,磁控管,电脑及配件。
(3) Others: hair dryers, televisions, mobile phones, motors, motor parts, toy magnets, magnetic toy parts, magnet processing products, magnetic health pillows, magnetic health products, compasses, car air pumps, drives, reducers, rotating Components, inductor components, magnetic coil sensors, electric gears, servomotors, multimeters, magnetrons, computers and accessories.