Leonardo Rafael de Mello' Posted July 23, 2014 Share Posted July 23, 2014 Hello Everyone, I'm running the Compressor performance check , and I have all values of compressor pressure above above a normal sittuation in T.O. 2J - T56-56 SWP 058 04, always in HIGH ZONE. In troubeshotting we have notice that PS3 (CDP) pressure begin taking in the 2 hours position, but in related manual Figure 2 the CDP pressure has to be taken in 11 hours position. I am still waiting for the next engine come from shop to test cell to fix that. My question is the oil tube (HOT OIL) that pass in the diffuser in 2 hours position next to the bleed presure tap (where I take the CDP pressure actually) can affect my CDP reading like that ? 27,58 inHg CIT (TAMB) 74 F PS3(CDP) EST. 103.3 psi PS3(CDP) READ 112.03 psi COMPRESSOR RATIO 8.02 ENGINE PERFORMANCE 97,18 % Thaks for all! Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted July 27, 2014 Share Posted July 27, 2014 In over 500 engines on test cell, I have only ever seen 1 engine in high zone. My calculator shows you should have a normal zone of 95.1 to 102.6. You need to check your test cell guages and transducers, as a start, and also check your thermocouples for correct TIT output. As a rule-of-thumb check, 75degrees on coordinator is very close to 900TIT for a T56/501 engine To check thermocouples, you need to find a way to switch over the IND/AMP wires at the T-block. I have a relay that I switch during the run (for safety reasons, I do this with TD switch in NULL) - a change of more than 6degrees C indicates a problem with TIT indication system Quote Link to comment Share on other sites More sharing options...
Leonardo Rafael de Mello' Posted July 29, 2014 Author Share Posted July 29, 2014 In over 500 engines on test cell, I have only ever seen 1 engine in high zone. My calculator shows you should have a normal zone of 95.1 to 102.6. You need to check your test cell guages and transducers, as a start, and also check your thermocouples for correct TIT output. As a rule-of-thumb check, 75degrees on coordinator is very close to 900TIT for a T56/501 engine To check thermocouples, you need to find a way to switch over the IND/AMP wires at the T-block. I have a relay that I switch during the run (for safety reasons, I do this with TD switch in NULL) - a change of more than 6degrees C indicates a problem with TIT indication system Hello pjvr99, yes, I had a problem with my transducer cables. Thanks for the answer. The compressor in Normal zone. Thanks for all. Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted August 1, 2014 Share Posted August 1, 2014 (edited) Well that was easy .... glad to assist :-) Several years ago, the computer system on my cell crashed completely. As an interim measure I installed regular aircraft guages and direct reading guages untill we received the new system. I made the installation dual, so even if the computer fails during a run, all indication continues uninterrupted. You may want to do similar on your cell Edited August 1, 2014 by pjvr99 Additional info Quote Link to comment Share on other sites More sharing options...
GVS Posted August 2, 2014 Share Posted August 2, 2014 Well that was easy .... glad to assist :-) Several years ago, the computer system on my cell crashed completely. As an interim measure I installed regular aircraft guages and direct reading guages untill we received the new system. I made the installation dual, so even if the computer fails during a run, all indication continues uninterrupted. You may want to do similar on your cell A very good idea.Redundancy dosen't hurt. Quote Link to comment Share on other sites More sharing options...
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