ENVIRONMENTAL CONTROL SYSTEM AIR CIRCUIT

An aircraft has a gas turbine engine (20,120) including a compressor section (122) that includes at least one compressor bleed (102,104,106,108). An environmental control system (ECS) has an air input configured to receive pressurized cabin air. An intercooler (130) has an input and an output. A selection valve (140) is configured to selectively connect the bleeds to an intercooler input. At least one auxiliary compressor (160,162) is connected to the intercooler output. An output of at least one auxiliary compressors is connected to an ECS air input. A controller (101) is configured to receive contemporaneous operational data, calculate minimum configuration requirements to satisfy environmental demands, and transmit calculated configuration requirements to at least the selection valve to achieve a desired pressure and temperature for the air downstream of the auxiliary compressor.