EFTA02352915.pdf

From: Pete Rawson < Sent: Sunday, April 10, 2016 8:20 PM To: jeffrey E.; Larry Visoski Cc: Pete Rawson Subject: Re: GIV update Hi Jeffrey, I have added my comments to your questions- From: jeffrey E. <jeevac=tion@gmail.com> Sent: Sunday, April 10, 2016 7:46 AM To: Larry Visoski; Pete Rawson Subject: Re: GIV update understood„ question , does the voltage max out at 9? My training manuals s=ow that the system is up to 14 VDC, it goes through a resistor and is a 10=VDC Maximum to the torque motor. Remember that the box=in the Radio Rack is an add-on, it is not normally installed, and there ar= no requirements for calibration- The 9 volts seems to =e appropriate for the full close signal to the valve- The valves respond to=Pressure, not voltage. The voltage is then c=nverted into a pressure that the valve responds to. if not then th= valve works at 9,? The valve is norm=lly open, the voltage shows sending a close signal, in this case, a full c=ose signal to increase the Temperature to 400 Degrees- The left side is =howing a signal for that side valve to be placed in a slightly open positi=n- It seems to be mo=ulating, as I suspect to be normal. altitude seems to effect it. so your answer seems po=sible, Both LP valves &q=ot;Fan Air valves" are original, they are not a high fail item. The valves are no= sent warm air through them, so "Cold Soaking" could be an issue= The valves are lo=ated in the pylons, just forward of the heat exchangers that are visible f=om below. The maintenance c=ecks for the system are basically- Engines running, =o airflow through the heat exchanger (guy on a ladder feeling for airflow)= high Tech. Select Wing heat, and confirm airflow overboard. Turn off wing hea=- Increase power, a=d confirm airflow, no numbers for power settings given- the voltage is applied as a result of resistance and compu=er. EFTA_R1_01332990 EFTA02352915 Correct, the inpu=s are the Temp sensor and Anticipator, being sent to the Controller (ie th= Computer). The valves are no= electrically controlled- The electric sign=ls are sent to a Torque motor. The panel show th= pressures being sent, and matches the voltages. The pressure is t=e most important part, as the valves respond to pressure. The Torque motor =onverts the electrical signal into a pressure input to the valves to Open/=lose them, No Voltage, No pr=ssure, valve is spring loaded to open- High voltage, hig= pressure, valve is commanded to close. There is no indic=tion of the valve responding to the command. The Torque motors=pressure regulators were swapped at Westfield- the right engine tgt is highter does that mean=that the fan valve is more closed than it should be? maybe a result =f a bad resisitor ? The LP air does not go through the Engine, So I don=t see it as an issue to account for any TGT split. The HP air bleed off would account for TGT issues.<=span> is it a big deal to change fan valve? No, not a big iss=e. We need to remove Pylon Panels, top and bottom. We can do it in a=nbsp; day. could it have been damaged by the bent tube you foun=? No, I can't see t=at- The line supplies=air in and out to control the valve position. The valve only re=ponds to the air pressure supplied. the other mystery is why a pulse =n the reading. ? valve? resistor , computer. , electrical bus?=/div> I suspect that th=re is a fault in the ground for the strobe lights- The pulse seems t= be regular. I don't think tha= the system could catch up with it. I haven't seen th= issue before- Regards,</=iv> Pete On Sun, Apr 10, 2016 at 7:17 AM, Larry Visoski <=pan dir="Itr"> • > >= wrote: Jeffrey Message from Pete,.below: Dave and I are at airport now in case you decide to depart earlier tha= 10am„ Plane is fueled and ready,. From Pete: Hello Jeffrey,<=p> 2 EFTA_R1_01332991 EFTA02352916  Larry knows that I am =ong winded with my responses, Here is my brief- Feel free to read all =t your leisure- They are mostly my tho=ghts so far- I suspect that the rig=t precooler (fan air) modulating valve is bad. They are both original= From the last video an= Photo's; The readings show that=the left side is being given a voltage to the Torque motor sending a&=bsp;pressure to command the valve to be partially closed. Zero volts, zero press=re is for full open, ie: cold air into the precooler and lowering the temp=rature into the supply system. The signals show a ste=dy state condition; 3 Volts, 3 PSI. The valve has been sen= signals, and has responded correctly, and therefore is in the proper posi=ion to maintain 400 degrees in the supply system. This is being monitore=, and controlled by the controller, and the sensor inputs. There is no signal fro= the valve, the temperature monitoring circuit controls the changes requir=d. The right side shows t=at it is being commanded to close due to the high voltage, and pressures.<=span> ( 9 volts, 9 PSI) It seems that the sign=ls are not being followed, or that the valve cannot respond to them. 3 EFTA_R1_01332992 EFTA02352917  Since the control syst=m does not see the temperature change from the sensors, it continues to in=rease the pressure to the valve. Brief complete-=/p> As for the full versio=- This was done as a dra=t, please excuse any duplication for items noted in the brief, these were =y original thoughts. I agree with all that =ou stated- The guidelines are for=what the electrical system does. We have found a bad co=troller- the sweeping voltage and pressures, and replaced it- There was also a bad s=nsor that was replaced- We have swapped the pr=ssure regulator/torque motors. Latest swap was the An=icipators. There seem to be multi=le issues, and we are narrowing them down. I believe that the ele=trical and control systems are now operating normally. Now on to the air side=of it. From the last video, a=d photo's- I believe that the lef= side is operating properly. The Temp is being cont=olled by sending a regulated pressure to the valve, and it responding. The pressure supplied =s closing the valve, and maintaining the 400 Degrees requested. No voltage equals no p=essure, Valve open, lowering the Temperature. 4 EFTA_R1_01332993 EFTA02352918 The right side shows g=ving a close signal to the precooler (fan air) valve. High Voltage, and pres=ure supplied to the Valve on that side to close, and increase the temperat=re. That side doesn't seem=to respond. The valve has a 4 inch=input/output side. The control line is ab=ut 1/4 inch. That is one of the lin=s that we found collapsed, and started us on this direction. Is it possible that th= supply air is not being able to overcome the pressure at the valve? The pressure read at t=e panel is a control pressure, also known as "Muscle air". Maybe the input air at=the 4 inch diameter inlet, can overcome the control air. I again suspect an iss=e with the LP valve- There is no valve posi=ion, or feedback signal from the valve- The electrical signal =s showing to close the valve, The pressure is also s=owing to close the valve. One way to check is to=select Wing heat on- The system causes the =pplicable side to remove the signals, and allow the valves to go full open= Wing heat is not norma=ly used at altitude- When the aircraft is i= below 0 degrees temps, there is no reason, since any precip won't stick.<=span> Ask Larry if there any=issues with selecting the wing heat on at altitude- I don't believe that t=ere are any limits to the altitude, but the fuel burn will be increased4=pan> Just a quick check- 5 EFTA_R1_01332994 EFTA02352919  The ground checks for =he precooler system are limited, Engines running, there=should be no air flowing from the lower pylon heat exchanger at idle- Increase power, and th=re should be airflow noticed. My training manual sho=s that the valve should start to open at about 74% HP on the ground, Wing heat on, there sh=uld be airflow. Regards, Pete Sent from my iPhone please note The information contained in this communication is confidential, may be attorney-client privileged, may constitute 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 prohibited and may be unlawful. If you have received this communication in error, please notify us immediately by return e-mail or by e-mail to jeevacation@gmail.com <mailto:jeevacation@gmail.com> , and destroy this communication and all copies thereof, including all attachments. copyright -all rights reserved 6 EFTA_R1_01332995 EFTA02352920