pjvr99 Posted November 11, 2015 Share Posted November 11, 2015 Hey guys My topic is a follow on of this discussion. Over the last several months we have had a large number of TD related problems. Some have been fixed by the usual TD am or valve change, or just a careful yellow box. Many have either been sent to me in the test cell, or I have spotted enough of a disparity to warrent further investigation. The most common failing is a high take off TIT in AUTO, with a lean fuel control. I like to set SLOPE and NORMAL at 1075°C and take things from there. As long as TIT doesnt exceed 1083°C we're good to go. Normally a new amp or a bit of careful tweeking of the NULL orifice and the CIT can bring everything in line. Recently these things just had no effect. Chatting to a test cell operator in the US, he told me that he had installed another TIT guage in his cab connected to the AMP terminals on the T-block. I did the same and damn near had heart failure - with 1080°C showing on the IND side, I was only getting 1060 or so on the AMP side. Changed thermocouples and harnesses - voila! problem solved. I have now made this a fixed check on all engine runs when we do the TD system checks. Referance for this check can be found in 2J-T56-56 SWP 058 03 Sect 15 Quote Link to comment Share on other sites More sharing options...
md idris Posted March 18, 2018 Share Posted March 18, 2018 voltage and frequency normal of ac generator but doesn't take load and generator out light remain on.What's the problem may be? Quote Link to comment Share on other sites More sharing options...
Ahmer Posted October 24, 2018 Share Posted October 24, 2018 On 11/11/2015 at 6:28 PM, pjvr99 said: Hey guys My topic is a follow on of this discussion. Over the last several months we have had a large number of TD related problems. Some have been fixed by the usual TD am or valve change, or just a careful yellow box. Many have either been sent to me in the test cell, or I have spotted enough of a disparity to warrent further investigation. The most common failing is a high take off TIT in AUTO, with a lean fuel control. I like to set SLOPE and NORMAL at 1075°C and take things from there. As long as TIT doesnt exceed 1083°C we're good to go. Normally a new amp or a bit of careful tweeking of the NULL orifice and the CIT can bring everything in line. Recently these things just had no effect. Chatting to a test cell operator in the US, he told me that he had installed another TIT guage in his cab connected to the AMP terminals on the T-block. I did the same and damn near had heart failure - with 1080°C showing on the IND side, I was only getting 1060 or so on the AMP side. Changed thermocouples and harnesses - voila! problem solved. I have now made this a fixed check on all engine runs when we do the TD system checks. Referance for this check can be found in 2J-T56-56 SWP 058 03 Sect 15 Pjvr , TD tester is very useful for troubleshooting TD system problem and help to identify unservicable components of TD system. Quote Link to comment Share on other sites More sharing options...
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