A system for use in a gas turbine engine , the system comprising: a starter air valve ;an auxiliary power unit (APU) ; a sensor configured to measure a rotational speed of the gas turbine engine; a controller in electronic communication with the starter air valve , the auxiliary power unit (APU) , and the sensor; and a tangible, non-transitory memory configured to communicate with the controller, the tangible, non-transitory memory having instructions stored thereon that, in response to execution by the controller, cause the controller to perform operations comprising: receiving, by the controller, the rotational speed of the gas turbine engine from the sensor; transmitting, by the controller, an APU command to the APU, wherein the APU command is based on the rotational speed of the gas turbine engine and is configured to control a pressure (P1) of the supply airflow to the starter air valve; and transmitting, by the controller, a starter air valve command to the starter air valve, wherein the starter air valve command is based on the engine sensor feedback and is configured to control an output pressure (P2) of the airflow to an engine starter , wherein the starter air valve command comprises a pulse width modulation (PWM) control scheme configured to modulate the output pressure of the airflow to the engine starter; and wherein the PWM control scheme is configured to turn the starter air valve on and off in pulses, wherein the "on" pulses are longer than the "off' pulses. a starter air valve ;an auxiliary power unit (APU) ; a sensor configured to measure a rotational speed of the gas turbine engine; a controller in electronic communication with the starter air valve , the auxiliary power unit (APU) , and the sensor; and a tangible, non-transitory memory configured to communicate with the controller, the tangible, non-transitory memory having instructions stored thereon that, in response to execution by the controller, cause the controller to perform operations comprising: receiving, by the controller, the rotational speed of the gas turbine engine from the sensor; transmitting, by the controller, an APU command to the APU, wherein the APU command is based on the rotational speed of the gas turbine engine and is configured to control a pressure (P1) of the supply airflow to the starter air valve; and transmitting, by the controller, a starter air valve command to the starter air valve, wherein the starter air valve command is based on the engine sensor feedback and is configured to control an output pressure (P2) of the airflow to an engine starter , receiving, by the controller, the rotational speed of the gas turbine engine from the sensor; transmitting, by the controller, an APU command to the APU, wherein the APU command is based on the rotational speed of the gas turbine engine and is configured to control a pressure (P1) of the supply airflow to the starter air valve; and transmitting, by the controller, a starter air valve command to the starter air valve, wherein the starter air valve command is based on the engine sensor feedback and is configured to control an output pressure (P2) of the airflow to an engine starter , wherein the starter air valve command comprises a pulse width modulation (PWM) control scheme configured to modulate the output pressure of the airflow to the engine starter; and wherein the PWM control scheme is configured to turn the starter air valve on and off in pulses, wherein the "on" pulses are longer than the "off' pulses. <EOS>