Which practice is required when loading explosives to prevent accidental ignition?

• A. Cargo heaters must be disabled
• B. The engine must be running
• C. The battery must be disconnected
• D. The door must be left open

Answer: (A)

Preventing ignition sources in the cargo area is essential when loading explosives. Cargo heaters are heat sources that could raise the temperature of the explosives and cause ignition, so they must be turned off or disabled during loading to minimize that risk.

Leaving the engine running would add heat and vibrations, increasing the chance of ignition. Disconnecting the battery isn’t the required practice to address heating risks in the cargo area and could disable safety systems. Leaving the door open does not reduce ignition risk and also creates security and contamination concerns.