From: Pete Rawson To: jeffrey E. <[email protected]> CC: Larry Visoski Subject: Re: Fun Date: Tue, 01 Dec 2015 22:44:47 +0000 Hello Jeffrey, The quick answer is Yes. Longer explanation: Each side has a dedicated system since they only need to control the respective engine air output. It is a loop system- The engine bleed air temperature going to that side Pack is checked by a sensor and anticipator. The resistance values change with temperature. This is sent to a controller which decides whether to more open or close the precooler valve to get the 400 degrees. The controller then sends an output voltage to the Torque motor- that is the voltage seen on the panel- The Torque motor has air pressure supplied. It either allows pressure through it, or vented, and regulates the air pressure depending on the voltage signal- that is the pressure reading on the panel- The control air from the Torque motor flows through lines (including the kinked line that we replaced, and sent us down this path) to overcome spring pressure and change the position of the precooler valve. Either more open or closed. The valve should respond to a new position and the sensor and anticipator monitor the change, send signals to the controller, which will signal the Torque motor, etc, etc. From the video from Westfield- Both readings were all over on the right side, left side had changes, but subdued. I suspect as normal with power changes, and the loop system. It was signaled to make a change, and kept track of the change. We replaced the right precooler sensor, and swapped the Anticipators. The test flight seemed to show normal readings on both sides, so we left it at that for the next trips. Next steps would be to swap Torque motors, they could have internal leakage causing an over/under shoot of the controller signals. Swap controllers- Regards, Pete Pete Rawson Chief Inspector Meridian Jet Center www.meridian.aero On Dec 1, 2015, at 3:47 PM, Jeffrey E. <jeevac