<table><tr><th>From:</th><th>jeffrey E. &lt;jeevacation@gmail.com&gt;</th></tr><tr><td>Sent:</td><td>Saturda , A ril 9, 2016 2:13 PM</td></tr><tr><td>To:</td><td>Ivjet;</td></tr></table>

The precooler fan air modulating valve (installed in the ergine pylon) controls fan air airflow to the precooler in order to maintain a nominal 40=° F (204° C) bleed air temperature. Precooler outlet air temperature is continuously monitored by a precooler outlet temperature sensor and a precooler temperature control anticipator sensor. Outputs from these sensors are transmitted to the precooler temperature controller. The controller, in turn, will change the output voltage to the servo air pressu=e regulator and torque motor. The servo air pressure regulator and torque motor then changes the electrical signal to a filtered pneumatic signal, positioning the precooler fan air modulating valve accordingly

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