Transport of Dangerous Goods by Air — Page 220, Lesson 323

I want to walk you through the definitions that form the foundation of transporting dangerous goods by air. These are the exact terms you need to know as a professional pilot, because they appear in regulations, manuals, and operational documents. Let's take them in order. First, Incompatible. This describes dangerous goods which, if mixed, would be liable to cause a dangerous evolution of heat or gas, or produce a corrosive substance. So if two items are incompatible, you must never let them come into contact during loading, stowage, or transport — the result could be a chemical reaction that generates heat, releases harmful gas, or creates something corrosive that damages the aircraft or injures people. Next, Operator. An operator is a person, organisation or enterprise engaged in or offering to engage in aircraft operation. That means any company or individual that actually runs aircraft flights, or offers to do so, is the operator. As a pilot, you work for the operator, and the operator holds the operational responsibility under the regulations. Overpack. This is an enclosure used by a single shipper to contain one or more packages to form one handling unit for convenience of handling or stowing. Imagine a shipper has several separate boxes of dangerous goods. They can put all those boxes inside one larger outer container — that outer container is the overpack. It makes it easier to move and load as a single item. But note: only the same shipper can create an overpack, and the packages inside must already comply with all the rules individually. Package. This is the complete product of the packing operation, consisting of the packaging and its contents prepared for transport. So when you see a box or drum labelled with dangerous goods markings, that entire unit — the outer container plus what's inside it, ready to ship — is the package. Packaging. This is a slightly different term. Packaging means receptacles or any other components or materials necessary for the receptacle to perform its containment function and to ensure compliance with the packaging requirements of Annex 18. So packaging is the physical container itself — the drum, the box, the bottle — plus any cushioning, absorbent material, or closures that make it work properly. The packaging is what holds the dangerous goods safely. Packing. This is the operation — the action — by which articles or substances are enveloped in wrappings and/or enclosed in packaging or otherwise secured. So packing is the process you go through to put the dangerous goods into the packaging. The person doing the packing must follow specific procedures to make sure the goods are properly contained. Passenger Aircraft. This is an aircraft that carries any person other than a crew member, an operator's employee in an official capacity, an authorized representative of an appropriate national Authority, or a person accompanying a consignment or other cargo. In plain terms, if the aircraft has anyone on board who isn't flight crew, isn't an airline employee on duty, isn't a government inspector, or isn't someone travelling with the cargo, then it's a passenger aircraft. This matters because the rules for carrying dangerous goods are much stricter on passenger aircraft than on cargo aircraft. Pilot in Command. The pilot responsible for the operation and safety of the aircraft during flight time. That's you, once you're the designated PIC. You have specific duties regarding dangerous goods — for example, you must be notified of what's on board, and you have the authority to refuse a shipment if you believe it's unsafe. Proper Shipping Name. This is the name to be used to describe a particular item or substance in all shipping documents and notifications and, where appropriate, on packaging. Every dangerous substance has an exact, official name assigned in the regulations — for example, "Acetone" or "Lithium Ion Batteries" — not a trade name or a vague description. That exact name must appear on the paperwork and often on the package itself, so everyone handling it knows precisely what it is. Serious Injury. This is an injury sustained by a person in an accident that meets any of several criteria. It requires hospitalization for more than 48 hours, starting within seven days from the date the injury was received. Or it results in a fracture of any bone — except simple fractures of fingers, toes, or nose. Or it involves lacerations which cause severe haemorrhage, nerve, muscle or tendon damage. Or it involves verified exposure to infectious substances or injurious radiation. This definition is important because if a dangerous goods incident causes a serious injury, it triggers mandatory reporting and investigation. State of Origin. This is the State in the territory of which the cargo was first loaded on an aircraft. So if a shipment starts its air journey in Germany, Germany is the State of Origin — even if the cargo later transits through other countries. State of the Operator. This is the State in which the operator has his principal place of business, or if he has no such place of business, his permanent residence. So if your airline is based in the United Kingdom, the UK is the State of the Operator. That State's regulations govern your operations, including how you handle dangerous goods. These definitions are the building blocks. Every regulation, every procedure, every checklist you'll use for dangerous goods relies on these exact meanings. Take a moment to let them settle, and when you're ready, we can move on to how they fit together in practice.