Heat exchanger device for an aircraft engine comprising a fuel-oil heat exchanger

A heat exchanger device for an aircraft engine comprising a fuel-oil heat exchanger for the indirect transfer of thermal energy between fuel and oil, having a feed area of the fuel-oil heat exchanger, for the fuel, which is delimited by a front plate of the fuel-oil heat exchanger, through which fuel can flow, and an opposite casing area, and having a discharge area which is arranged on a side of the fuel-oil heat exchanger which faces away from the feed area, wherein fuel can be led through a bypass line extending parallel to the fuel-oil heat exchanger and having a bypass valve for controlling the fuel volume flow through the bypass line, characterized in that at least part of the oil flow which can be led through the fuel-oil heat exchanger can be conducted through the casing area upstream of the fuel-oil heat exchanger, and thermal energy can be transferred indirectly between the oil volume which flows through the casing area and the fuel in the feed area.