Which of the following is NOT a common hazard found on ships or in aviation?

Biohazard waste is not typically considered a common hazard found on ships or in aviation compared to the other options. While biohazard waste can exist in specific contexts, such as in medical facilities or when dealing with research related to biology, it is not a standard hazard encountered in general shipping or aviation operations.

In contrast, magnesium can be a fire hazard when involved in certain operations due to its flammability and the potential for creating intense fires. Fire extinguishing agents, while essential for safety, can pose hazards if they are not stored or handled correctly, as some agents may be toxic or reactive under certain conditions. Ordnance represents another common hazard in military aviation and naval operations where weapons are present, posing risks associated with explosive materials.

Understanding the roles and risks associated with these materials is crucial for maintaining safety protocols in the aviation and maritime industries.