U.S. regulations require having a responsible person present at the hatches of spaces containing Class 1 explosive materials. When does the requirement apply during cargo operations?

Correct Answer: Option A — any time the hatch containing the explosive is open whether the handling of cargo is in progress or not

U.S. hazardous materials regulations mandate constant attendance by a designated responsible person at any cargo space hatch containing Class 1 explosives whenever that hatch is open, regardless of whether active cargo handling is currently taking place.