AIRCRAFT CONTROL SYSTEM

An aircraft control system ( 100 ) including an aircraft control module ( 110 ) and a test module ( 120 ). The aircraft control module includes a memory storing a machine learning model ( 130 ) adapted, based on received live aircraft operating inputs ( 102 a - 102 f ), to generate live aircraft control outputs ( 104 a - 104 b ). The test module ( 120 ) includes a memory storing input data representing test aircraft operating inputs ( 102 a ′- 102 f ′) and respective output data representing expected aircraft control outputs ( 114 a, 114 b ) that are expected to be generated by the aircraft control module in response to an input of the respective test aircraft operating inputs ( 102 a ′- 102 f ′). The test module ( 120 ) is adapted to write test aircraft operating inputs ( 102 a ′- 102 f ′) to the aircraft control module, read test aircraft control outputs ( 104 a ′- 104 b ′) of the aircraft control module ( 110 ), and remove the authority of the aircraft control module ( 110 ) to perform aircraft control.