EFTA02467713.pdf

From: jeffrey E. <jeevacation@gmail.com> Sent: Sunday, April 10, 2016 11:50 AM To: Larry Visoski Subject: Re: GIV update any issues with turning on wing heat at altitude? On Sun, Apr 10, =016 at 7:17 AM, Larry Visoski <mailto > wrote: Jeffrey Message fr=m Pete,.below: Dave and I are at airport no= in case you decide to depart earlier than 10am„ Plane is fuele= and ready,. From Pete: Hello Jeffrey, Larry knows that I am long winded with my responses,<=span> Here is my brief- Feel free to read all at =our leisure- They are mostly my thoughts=so far- I suspect that the right precooler (fan air) modulating valve is bad= They are both original. From the last vid=o and Photo's; EFTA_R1_01576797 EFTA02467713 The readings show that the left side is being given = voltage to the Torque motor sending a pressure to command the valve =o be partially closed. Zero volts, zero =ressure is for full open, ie: cold air into the precooler and lowering the=temperature into the supply system. The =ignals show a steady state condition; 3 Volts, 3 PSI. The valve has been sent signals, and has responded correctl=, and therefore is in the proper position to maintain 400 degrees in the s=pply system. This is being monitored, an= controlled by the controller, and the sensor inputs. There is no signal from the valve, the temperature monitori=g circuit controls the changes required. The right side shows that it is b=ing commanded to close due to the high voltage, and pressures. <= style="margin-top:Opx;margin-bottom:Opx">( 9 volts, 9 PSI) =t seems that the signals are not being followed, or that the valve cannot =espond to them. Since the control system=does not see the temperature change from the sensors, it continues to incr=ase the pressure to the valve. Brief complete- As for the full version-=/p> This was done as a draft, please excuse any dup=ication for items noted in the brief, these were my original thoughts. I agr=e with all that you stated- The guidelin=s are for what the electrical system does. We have found a bad controller- the sweeping voltage and pressures, and =eplaced it- There was also a bad sensor =hat was replaced- =span style="background-color:rgba(255,255,255,0)">We have swapped the pr=ssure regulator/torque motors. 2 EFTA_R1_01576798 EFTA02467714 Latest sw=p was the Anticipators. There seem to be=multiple issues, and we are narrowing them down. I believe that the electrical and control systems are now operatin= normally. Now on to the air side of it.=/span> F=om the last video, and photo's- I be=ieve that the left side is operating properly. The Temp is being controlled by sending a regulated pressure to the =alve, and it responding. The pressure su=plied is closing the valve, and maintaining the 400 Degrees requested. No voltage equals no pressure, Valve open, l=wering the Temperature. style="margin-top:Opx;margin-bottom:Opx">The right side shows giving a close signal to the pr=cooler (fan air) valve. High Voltage, an= pressure supplied to the Valve on that side to close, and increase the te=perature. That side doesn't seem to =espond. The valve has a 4 inch input/out=ut side. The control line is about 1/4 i=ch. That is one of the lines that we fou=d collapsed, and started us on this direction. Is it possible that the suppl= air is not being able to overcome the pressure at the valve? The pressure read at the panel is a control pressure,=also known as "Muscle air". Ma=be the input air at the 4 inch diameter inlet, can overcome the control ai=. I again suspect an issue with the LP v=Ive- There is no valve position, or feedback signal from the valve-=/p> 3 EFTA_R1_01576799 EFTA02467715 The electrical signal is showing to close the v=lve, The pressure is also showing to c=ose the valve. One way to check is to select Wing heat on- The system causes the applicable side to remove the sign=ls, and allow the valves to go full open. Wing heat is not normally used at altitude- When the aircraft is in below 0 degrees temps, there is no reason, sin=e any precip won't stick. Ask Larry =f there any issues with selecting the wing heat on at altitude- =p style="margin-top:0px;margin-bottom:0px">l don't believe that there are any limits to th= altitude, but the fuel burn will be increased. Just a quick check-</=> The ground=checks for the precooler system are limited, Engines running, there should be no air flowing from the lower pylon h=at exchanger at idle- Increase power, an= there should be airflow noticed. My tra=ning manual shows that the valve should start to open at about 74% HP on t=e ground, Wing heat on, there should be =irflow. Regards, Pete Sent=from my iPhone =br> =AO please note 4 EFTA_R1_01576800 EFTA02467716 The information contained in this=communication is confidential, may be attorney-client privileged, mayconstitute inside information, and is intended only for the use of the=addressee. It is the property of JEE Unauthorized use, disclosure or=copying of this communication or any part thereof is strictly prohibiter and may be unlawful. If you have received this communication in err=r, please notify us immediately by return e-mail or by e-mail to jeevacation@gmail.com<=a>, and destroy this communication and all copies thereof, including=all attachments. copyright -all rights reserved 5 EFTA_R1_01576801 EFTA02467717