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Oil coolers for aviation gas-turbine engines are either simple oil radiators with air cooling or the kind that uses fuel as the cooling medium. The latter type of unit is used on the Lycoming T55 engine. The fuel oil-cooling unit is a heat exchanger which transfers the heat in the oil to the fuel flowing to the fuel nozzles. Since the fuel flow through the cooler is much greater than the oil flow, the fuel is able to absorb a considerable amount of heat from the oil, thereby reducing the size and weight of the cooler. The fuel oil-cooler is shown in figure 2.11. An air cooler is shown in figure 2.14.

Simplex Fuel Nozzle
Figure 2.14. Air Oil Cooler.



David L. Heiserman, Editor

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Revised: June 06, 2015