EFTA01131128

From: Larry <IIMI > To: Je vacation <jeevacation®gmail.com> Cc: Rich Kahn Subject: Fwd: ICBAF Date: Fri, 20 Nov 2015 04:53:26 +0000 Attachments: IMG_ I 337.MOV Inline-Images: image I .JPG Jeffrey, Attached is video from today's flight showing voltage and pressure fluctuations on right precooler, with throttles reduced, pressure and voltage remains steady with throttles at higher power setting the voltage and pressure fluctuated on right. See Pete's message below. With your approval, we will change Temp sensor, cost $4,000 before flight Friday. Hi Larry, Here is the schematic for the system. -From the videos- The pressure reading is what controls the valve position. The valve is responding to the voltage signal from the controller. Fail safe open, no pressure/voltage applied, valve is open. As you can see in the video, the voltage supplied to the torque motor, which then positions the valve, is all over the place. The valve then is trying to open/close as requested. That explains the PSI changes, disregard the delay in the display, it follows the voltage. The later video- on descent, with lower power settings, has the readings steady, the same readings on both sides. I don't see an issue with the controller, as I originally thought. The controller is sent input from the temp sensor, and anticipator. Both are original. The sensor is about $4K. I will have it replaced prior to the trip. The anticipator is $77K, will hold off on that replacement for now. I would prefer that we do one item at a time- if the issue goes away with the new sensor- great! If the issue remains- I would recommend swapping the Anticipators, to prove anticipater is at fault. Late night thought- The sensor makes the most sense, The issue seems to be at higher power settings when the system is looking at both sensors. At high power settings, the system uses the anticipator first, the temp sensor is set to maintain the 400 degree set point. If it doesn't see the setting point, could it send a low temp signal to the controller and allow the anticipator to try to bring it back to 400, then the anticipator would command it back open/closed. A back and forth scenario, like what I saw on the displays. On power back, the 400 degree sensor can't react, since the engine air supply is below that point. Pete EFTA01131128 r h .abi .4mas ceta- sillialilin e 10 0 TO inASTAI eananVAIAI KAABA.* .0011•0.0 tAP.4.4 n• S TAt CCA/PASThlf PYLON t2000 illitUAN Phi MAA0 0 Woman° HAG Ni, %CH IMIESMAlt Figure 36-13 Precookir and Servo Air System---Modulation Valve Open 36-26 run ICIAININ1i PlOilifMtc OM I Sent from my iPad Begin forwarded message: From: Pete Rawson Date: November 19, 2015 at 3:54:44 PM EST To: ' <IM >, Pete Rawson < Subject: KBAF I had to trim the video Here is toward the end in low alt cruise. 14k ish at 300 kts EFTA01131129 Pete Rawson Chief Inspector Meridian Jet Center \\.w.ineridian.acro EFTA01131130