What must be done if the engine fire persists after attempting initial actions?

If an engine fire persists after initial actions have been taken, the appropriate response is to continue motoring the engine. This action serves a critical purpose: it helps to ensure that any residual fuel or unburned material is cleared out of the engine, which can contribute to extinguishing the fire. Continuing to operate the engine in this situation can also help prevent the accumulation of flammable materials that might otherwise ignite, thereby reducing the risk of the fire escalating.

Motoring the engine involves running it at low power settings, which can allow the system to cool down and might also help in identifying whether the fire can be contained or has been extinguished. Utilizing extinguishing agents, while necessary initially, may not be effective if the fire continues after the primary actions are taken. Hence, maintaining the engine's operation can be a strategic approach in managing the situation until comprehensive control measures can be performed.