Davidson88 Posted June 23, 2010 Share Posted June 23, 2010 How is it going? I work at the depot and we are have a issue that has stumped us so I'm hoping someone out there has had this issue before. On a 65 model our temp control wants to migrate back to cool when pressurizing in manual while driving hot. We have changed the temp control valve, flow control, thermostats, control boxes, and pressure controller but nothing seems to fix this problem. We can only get to three inhg on the ground. The electrics shop has shot the wires and says they are good. We put a 240 degree thermostat in the unit and the unit wouldn't drive hot so we tried it with the thermostat still hooked up but pulled out of the unit and it drove hot. The engineers say that the 240 thermostat is the right one for that model. Can anyone shed some light on this subject for me. Thanks Quote Link to comment Share on other sites More sharing options...
bischoffm Posted June 23, 2010 Share Posted June 23, 2010 I worked an aircraft a while back with cargo air going full hot in auto and manual. We did the same changed everything we even went so far as to re-wire from the temp control valve to the control box (spliced in the wires didn't have CP) still the same problem when the NEW cannon plug was installed it fixed the problem. The wire all checked good prior to replacing them. Another thing is make sure the thermostats (we used a jetcal tester) are working properly. We had a rash of 100 or so bad a few years back. Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted June 23, 2010 Share Posted June 23, 2010 jump your temp control box I think B-E and C-F then drive your valve to hot (go slow as you have no duct sensor) if this works replace your duct sensor... if it is bad it will send a "less heat" signal all the time and drive full cold.... Quote Link to comment Share on other sites More sharing options...
Davidson88 Posted June 23, 2010 Author Share Posted June 23, 2010 I see that you are at Kadena and this ac I'm talking about is from there are you familiar with this tail number 65000992 Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted June 23, 2010 Share Posted June 23, 2010 Duct anticipator (sensor) controls the more heat signal...... Quote Link to comment Share on other sites More sharing options...
Davidson88 Posted June 23, 2010 Author Share Posted June 23, 2010 This stupid thing will not do the samething twice. We get working right then it does something totally different. Today our flt deck PAC started working in manual but wouldn't work in auto then our cargo PAC drove to cold but when we tried to drive to hot nothing would happen shot the plug and now we have 28 volts on both hot and cold. The fi tells us to connect a temp control test box and it seems that no one knows where to get one has any one used this tester Quote Link to comment Share on other sites More sharing options...
bischoffm Posted June 24, 2010 Share Posted June 24, 2010 That tail left before I got here!! I does sound familiar with what we dealt with for cargo air. The anticipator stats were the ones that were coming in bad (forgot to mention with stat). We would turn cargo ac on an then you could watch the valve got to full hot every time. This drove a rewire and CP change. (we used a known good stat to confirm that was not the problem):cool: Quote Link to comment Share on other sites More sharing options...
Nc97 Posted June 24, 2010 Share Posted June 24, 2010 This stupid thing will not do the samething twice. We get working right then it does something totally different. Today our flt deck PAC started working in manual but wouldn't work in auto then our cargo PAC drove to cold but when we tried to drive to hot nothing would happen shot the plug and now we have 28 volts on both hot and cold. The fi tells us to connect a temp control test box and it seems that no one knows where to get one has any one used this tester Jason, The NSN for the tester is 4920-00-014-1504, but at $72,520.00 I belive you are going to have a hard time acquiring one. Lockheed Martin has them... Your neighbor Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted June 25, 2010 Share Posted June 25, 2010 Remove "pressurization and Air conditioning" from the same sentence. The only common point would be the AC Press Master switch. Make sure the wires on the back are tight... Jump both of your temp control boxes. B to E and then C to F. This will remove all the voltage sources except the manual temperature control. Be carful as you do not have any duct protection. If the valves respond to your temperature switch then your basic system is operable. Then you can tshoot the control system. Quote Link to comment Share on other sites More sharing options...
Davidson88 Posted June 25, 2010 Author Share Posted June 25, 2010 Ok we changed the plug and that didn't fix the issue. Now we are changing the control box again to ensure we didn't get a bad one but who knows. Thanks to all of you who replied to help out. Quote Link to comment Share on other sites More sharing options...
bischoffm Posted June 28, 2010 Share Posted June 28, 2010 Sorry it didn't work:confused: do let us know what ends up fixing it (besides beating the crap out of it with a hammer (sorry thats the crew chief coming out in me). Quote Link to comment Share on other sites More sharing options...
keepemflying130 Posted July 8, 2010 Share Posted July 8, 2010 B-E and C-F . Yes "Big Ethel Can F" does anyone remember any others for the jump out cheats, or t/s tricks. Just curious, probably should be another thread. Quote Link to comment Share on other sites More sharing options...
Nc97 Posted July 9, 2010 Share Posted July 9, 2010 B-E and C-F . Yes "Big Ethel Can F" does anyone remember any others for the jump out cheats, or t/s tricks. Just curious, probably should be another thread. (B)ad (B)oys ®avish (O)ur (Y)oung (G)irls (B)ut (V)iolet (G)ives (W)illingly Quote Link to comment Share on other sites More sharing options...
kingair200 Posted July 12, 2010 Share Posted July 12, 2010 check the part number on the control box Quote Link to comment Share on other sites More sharing options...
Davidson88 Posted July 24, 2010 Author Share Posted July 24, 2010 Alright finally what we have come up with is the temp control boxes that we were get were coming in bad and they were sending alt. number boxes. Thanks for everyones responses.:) Quote Link to comment Share on other sites More sharing options...
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