A gas turbine engine, comprising: a case assembly disposed about a gas turbine engine core disposed within a cowl, the cowl defining a core compartment; a pre-cooler having a bypass inlet, a bleed air inlet, a bleed air outlet operatively connected to an environmental control system through a conditioned bleed air line that includes a bleed air temperature sensor that is in communication with the environmental control system, and a bypass outlet, a fan air valve operatively connected to the bypass inlet, the fan air valve configured to selectively inhibit and facilitate a provision of bypass air to the pre-cooler; a bleed air conduit having a pressure regulating/shut-off valve operatively connected to the bleed air inlet and a compressor section of the gas turbine engine core, the pressure regulating/shut-off valve being movable between an open position that facilitates a flow of bleed air from the compressor section to the pre-cooler and a closed position that inhibits the flow of bleed air from the compressor section to the pre-cooler; and a controller in communication with the fan air valve, the environmental control system, and the pressure regulating/shut-off valve, wherein: the controller is configured to assess whether the pressure regulating/shut-off valve is open or closed, and if the pressure regulating/shut-off valve is open, the controller is configured to calculate an open position of the fan air valve based on a temperature of bleed air monitored by the bleed air temperature sensor; and the controller is configured to operate the fan air valve to facilitate the provision of bypass air to the pre-cooler and the bypass outlet provides bypass air to the core compartment in response to the pressure regulating/shut-off valve being in the closed position and a core compartment temperature being greater than a target core compartment temperature. a case assembly disposed about a gas turbine engine core disposed within a cowl, the cowl defining a core compartment; a pre-cooler having a bypass inlet, a bleed air inlet, a bleed air outlet operatively connected to an environmental control system through a conditioned bleed air line that includes a bleed air temperature sensor that is in communication with the environmental control system, and a bypass outlet, a fan air valve operatively connected to the bypass inlet, the fan air valve configured to selectively inhibit and facilitate a provision of bypass air to the pre-cooler; a bleed air conduit having a pressure regulating/shut-off valve operatively connected to the bleed air inlet and a compressor section of the gas turbine engine core, the pressure regulating/shut-off valve being movable between an open position that facilitates a flow of bleed air from the compressor section to the pre-cooler and a closed position that inhibits the flow of bleed air from the compressor section to the pre-cooler; and a controller in communication with the fan air valve, the environmental control system, and the pressure regulating/shut-off valve, wherein: the controller is configured to assess whether the pressure regulating/shut-off valve is open or closed, and if the pressure regulating/shut-off valve is open, the controller is configured to calculate an open position of the fan air valve based on a temperature of bleed air monitored by the bleed air temperature sensor; and the controller is configured to operate the fan air valve to facilitate the provision of bypass air to the pre-cooler and the bypass outlet provides bypass air to the core compartment in response to the pressure regulating/shut-off valve being in the closed position and a core compartment temperature being greater than a target core compartment temperature. the controller is configured to assess whether the pressure regulating/shut-off valve is open or closed, and if the pressure regulating/shut-off valve is open, the controller is configured to calculate an open position of the fan air valve based on a temperature of bleed air monitored by the bleed air temperature sensor; and the controller is configured to operate the fan air valve to facilitate the provision of bypass air to the pre-cooler and the bypass outlet provides bypass air to the core compartment in response to the pressure regulating/shut-off valve being in the closed position and a core compartment temperature being greater than a target core compartment temperature.