What essential safety equipment should be used when working near the APU?

When working near the Auxiliary Power Unit (APU) on the C-130J, hearing protection and safety goggles are considered essential safety equipment. The APU can generate significant noise levels during operation, which can lead to hearing damage if proper hearing protection is not utilized. Additionally, safety goggles are crucial in protecting the eyes from potential hazards, such as debris or fuel spills that may occur when working with or around the APU. Ensuring the face and eyes are shielded from these hazards helps maintain a safer working environment.

The other options do provide certain levels of safety but may not be as critical in this specific context. For instance, while fire-resistant clothing and helmets are important, they may not be as universally required as hearing protection in this scenario. High-visibility vests and safety shoes are important for overall workplace safety, particularly in busy environments, but they do not specifically address the immediate risks associated with noise and flying debris when working near the APU. Dust masks and gloves, while useful in other contexts, do not address the primary hazards present near an operational APU as effectively as hearing protection and safety goggles do.