Every day, thousands of cargo shipments travel by air, carrying everything from everyday consumer products to industrial equipment. However, some seemingly harmless shipments may contain dangerous goods that have not been correctly identified or declared.
Known as hidden dangerous goods, these items can pose serious risks to aircraft, ground handling personnel and flight crews if transported without the necessary precautions.
According to the International Air Transport Association (IATA), approximately 80% of dangerous goods incidents reported to IATA during the first half of 2025 involved undeclared or hidden dangerous goods.
Understanding how to recognise these hazards is an essential part of maintaining safety throughout the air cargo supply chain.
What Are Hidden Dangerous Goods?
Hidden dangerous goods are hazardous substances or articles that may be present within cargo shipments without being immediately identifiable as dangerous goods.
These items are often shipped under general descriptions such as “electrical equipment”, “machinery” or “automotive parts”, which may not reveal the hazardous materials contained inside.
There is also an important distinction between two terms:
Undeclared dangerous goods: Items containing dangerous goods that have not been identified as required during the shipping process.
Misdeclared dangerous goods: Items where the dangerous goods have been incorrectly identified, classified or described.
Not all undeclared dangerous goods are deliberately concealed. In some cases, shippers may simply be unaware that their products are classified as dangerous goods for air transport.
Common Examples of Hidden Dangerous Goods
Many everyday products and commercial shipments can contain dangerous goods that are not immediately obvious from their appearance or description.
Items such as electronic equipment, automotive parts, camping supplies and chemical products may contain hazardous substances that are subject to air transport regulations.
Explore the examples below to discover some of the dangerous goods that may be hidden in common cargo shipments.
How Can Cargo Personnel Identify Hidden Dangerous Goods?
Recognising hidden dangerous goods requires a combination of training, awareness and effective cargo acceptance procedures.
Personnel should remain alert to potential warning signs, including:
- Vague cargo descriptions such as “chemicals”, “spare parts” or “equipment”.
- Hazard symbols or warning labels on packages that suggest dangerous contents.
- Shipping documents that do not accurately describe the goods.
- Packages showing signs of leakage, damage or contamination.
- Shipments containing batteries, pressurised equipment or chemical products.
- Uncertainty from shippers about the contents or classification of their goods.
If dangerous goods are suspected, personnel should follow their organisation’s procedures, seek clarification and refer the shipment to appropriately trained staff before it proceeds.
Suspected dangerous goods should never be accepted or transported simply because the shipment has not been declared as hazardous.
The Importance of Dangerous Goods Training
Identifying hidden dangerous goods is an important responsibility shared across the air cargo supply chain.
Shippers, freight forwarders, cargo acceptance staff, warehouse operatives and ground handling personnel all play a role in preventing undeclared dangerous goods from being transported.
Under the ICAO and IATA Competency-Based Training and Assessment (CBTA) approach, personnel must receive training appropriate to their responsibilities.
For example, warehouse personnel must understand how to recognise possible dangerous goods and respond to suspicious packages, while dangerous goods acceptance personnel require more detailed knowledge of regulatory requirements and acceptance procedures.
Effective training helps personnel recognise potential hazards, understand reporting procedures and prevent unsafe shipments from entering the air transport system.
Explore Dangerous Goods Training with Aviation Courses
At Aviation Courses, we provide online Dangerous Goods training for a wide range of aviation and cargo personnel.
Our self-paced courses are designed around relevant IATA CBTA functions, helping learners develop the knowledge and competencies required for their roles.
Whether you work in cargo handling, warehouse operations, shipping or dangerous goods acceptance, selecting the appropriate training is an important step towards maintaining aviation safety.
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