Clarified propane tank size and electrical requirements. Vapor is acceptable for interior fire (NFPA 1402 requirement and as fuel source for pilot ignition. Reinforced roof loading must support four person firefighting crew. Constant flame monitored pilot is acceptable per NFPA 1402. The trainer shall utilize waterless burn plaque burner assemblies sized to produce realistic fire behavior. This refers to the physical equipment used to create the fire itself. This modern system uses gas-fed plaques or pans that have gas burners integrated into them. When supplied with a fuel like propane or natural gas, they produce controlled, realistic flames over a specific surface area. The term waterless highlights a key benefit. Because the fire is gas-based, it can be shut off instantly with a valve. This eliminates the need for large volumes of water for extinguishment and cleanup after the training exercise, making it more environmentally friendly and efficient. Helicopter Fire Trainer