From: "jeffrey E." <jeevacation@gmail.com>
To: lvjet >,
Subject:
Date: Sat, 09 Apr 2016 14:13:05 +0000
The precooler fan air modulating valve (installed in the engine pylon) controls fan air airflow to the precooler in
order to maintain a nominal 400° 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 pressure 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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