An ice plug is a specific and potentially dangerous type of ice accumulation that occurs within a pipe, tube, or engine component, completely obstructing the flow of liquid or air. In aviation, an ice plug can form in the fuel lines or the engine's oil cooler if water contamination is present and the temperature drops below freezing. This can lead to a sudden loss of engine power or "flameout" because the blockage prevents fuel from reaching the combustion chamber. In a more domestic travel context, ice plugs can form in the plumbing of high-altitude lodges or camper vans if pipes are not properly insulated. To prevent ice plugs in aircraft, pilots use fuel heaters and additives like "PRIST," which lowers the freezing point of any moisture in the fuel system. Identifying and clearing these blockages is a critical part of pre-flight safety in cold-weather environments to ensure that all vital systems remain operational throughout the flight.