Regulatory Framework and Legal Responsibilities for Dangerous Goods
The layered framework
Dangerous goods regulation in civil aviation sits on a stack of instruments. At the top are the ICAO Standards and Recommended Practices (Annex 18) and the associated Technical Instructions for the Safe Transport of Dangerous Goods by Air (ICAO TI), which are the international baseline. National authorities then implement them: in the United States through 49 CFR Parts 100-185, in the European Union through the ICAO TI as given legal force by the implementing regulation on air transport of dangerous goods, and in Australia through the Civil Aviation Safety Regulations. Airline manuals, operator variations and IATA-style industry standards sit below the state level and may be stricter but never looser.
Who is legally responsible
Every "shipper" and "operator" has duties. The shipper must classify, pack, mark, label and document correctly and must ensure staff are trained. The operator must accept only compliant shipments, provide training to its own staff, and hold an approval where required (for example, for certain dangerous goods the operator needs state approval). The pilot-in-command must be informed of what is on board. Individuals can be personally liable; corporate liability does not replace personal liability.
Traps in questions
Questions often test the hierarchy: which document prevails when a state variation conflicts with the ICAO TI? The stricter rule applies. Another trap is confusing an approval with an exemption, or assuming an operator may carry anything if the shipper signs a declaration. A signed shipper's declaration does not transfer responsibility to the operator; the operator must still verify acceptance.
Rule of thumb
When in doubt, ask: who has the duty, and does the stricter rule apply? If a question names a role (shipper, operator, pilot, loader), the answer usually attaches a specific duty to that role rather than a general one.