A way to capture operational needs is derived from the stakeholder model of commercial aircraft system engineering. Via researching EMBRAER Service Newsletter, some needs of flight control PBIT(power-up built-in test) could be captured that flight control system should have the function of PBIT timing reader and message for PBIT in progress and appropriate Hydraulic PBIT hydraulic pressure threshold. It could enrich the preliminary design of civil aircraft to help reduce the problems shown in market operations. It could provide referred design way of civil aircraft.