Classify to fly: the invisible architecture that protects every flight
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At this precise moment, hundreds of thousands of people are crossing the sky at ten thousand metres. In the cargo holds of those same aircraft travel chemical substances that, in the event of a simple pressure drop, could trigger an absolute catastrophe. That it does not happen is not luck. It is the result of a system that treats chemistry as the supreme law.
Classification is not a bureaucratic step. It is the foundation of the entire dangerous goods safety system. Every subsequent decision — packaging, labelling, documentation, stowage — depends on the classification being correct.
Step 1: Identify the substance
The first step is to find the substance in the IATA DGR dangerous goods list (Section 4.2, the Blue Pages). Each entry provides the UN number, proper shipping name, hazard class, packing group, and applicable special provisions.
Step 2: Determine the hazard class
The nine UN hazard classes define the nature of the risk. A substance may have a primary class and one or more subsidiary risks — both must be communicated through hazard labels on the package.
Step 3: Assign the packing group
Most classes (except Class 1, 2 and 7) are further divided into packing groups I, II and III based on the degree of hazard. The packing group determines the packaging performance requirements and quantity limits.
Step 4: Check passenger vs. cargo aircraft restrictions
IATA DGR distinguishes between goods permitted on passenger aircraft (PAX) and those restricted to cargo aircraft only (CAO). Some substances are forbidden on passenger aircraft entirely. This is one of the most critical checks in the classification process.
Step 5: Apply correct labels and documentation
Once classified, the package must carry the correct hazard labels and the shipper must prepare the Shipper's Declaration for Dangerous Goods. These documents travel with the cargo and are the primary safety communication tool for everyone in the chain of responsibility.
The consequences of misclassification
Misclassification is one of the leading causes of dangerous goods incidents in air transport. A substance shipped under the wrong UN number, or with the wrong packing group, may be stowed incorrectly, handled without appropriate precautions, or loaded onto a passenger aircraft when it should be restricted to cargo-only. The consequences can be catastrophic — as demonstrated by incidents involving lithium battery fires that led to the CBTA training revolution.
Classification is the invisible architecture that protects every flight. Getting it right is not optional — it is the foundation on which every other safety measure depends.
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