System and method for air extraction from gas turbine engines

A system, comprising:

• a non-transitory machine-readable medium, comprising:
• code having one or more computer-executable routines comprising:
• monitoring a first signal representative of a first flow of extraction air from a first gas turbine engine and a second signal representative of a second flow of extraction air from a second gas turbine engine, or a third signal representative of a header pressure of an extraction air header, or any combination thereof, with an extraction air controller;
• and
• maintaining the first and second extraction air flows to the extraction air header in a symmetric load condition and an asymmetric load condition, wherein the symmetric load condition represents substantially equal loads on the first and second gas turbine engines, and the asymmetric load condition represents substantially different loads on the first and second gas turbine engines.