What manual establishes guidelines lines for entering fuel tanks?

• A. Commandant Instruction M5100.47
• B. Technical Manual 3-22
• C. Nav Spec 19-3
• D. Ops Manual 101

Answer: (A)

Guidelines for entering fuel tanks are established by formal safety instructions issued by the service. Commandant Instruction M5100.47 lays out the official policy and procedures for confined-space entry, which includes fuel tanks. It covers the safety measures required for entry, such as permit requirements, atmospheric considerations, ventilation, personal protective equipment, and rescue planning. These elements are specific to confined-space safety, not covered by the other manuals, which focus on equipment maintenance (Technical Manual 3-22), navigation standards (Nav Spec 19-3), or general operations (Ops Manual 101).