A.
It does not make a difference whether the term “hold” or “compartment” is used when the purpose is to describe that carbon dioxide gas is heavier than air and therefore concentrate on the lower level of the aircraft hull. The use of the term “hold” and “compartment” becomes decisive when it is used to allow stowage of a certain quantity of dangerous goods.

According to IATA Airport Handling Manual, the definition of a “HOLD” spells: “A hold is the space within an aircraft confined by ceiling, floor, walls and bulkhead used to carry load”, and the definition of a “COMPARTMENT” spells “A compartment is a space within the hold”.

In the DGR, the term “compartment” is used with the meaning of a “hold”.