T56 GUY 10 Posted March 8, 2018 Share Posted March 8, 2018 Has anyone ever experienced crossover TIT going to 900 lights out and correcting between 800-840 degrees? Quote Link to post Share on other sites
oziejo 0 Posted March 8, 2018 Share Posted March 8, 2018 Hi there, have you used the T.D. amplifier test? check the T.D. valve , values. Similar malfunction yesterday changed the T.D. valve. Quote Link to post Share on other sites
pjvr99 35 Posted March 9, 2018 Share Posted March 9, 2018 yes. fuel control is just very rich at that point in schedule - nothing to be concerned about unless you out of limits on rich/lean check Quote Link to post Share on other sites
Lkuest 23 Posted March 10, 2018 Share Posted March 10, 2018 On 3/8/2018 at 5:00 AM, T56 GUY said: Has anyone ever experienced crossover TIT going to 900 lights out and correcting between 800-840 degrees? I agree with pjvr. What you are describing is a throttle misalignment below crossover, for which there is no limit. If everything else is within limits, there isn't a problem. If you are still really concerned about this, you could check for air leaks, but you should also have lower torque and slower starts. You could also adjust the TD Valve and/or Fuel Control, but ONLY if the rich/lean check shows rich AND you have warm start temperatures and well within normal start times. Otherwise, it sounds like the TD system is doing its job well, and stops controlling when it's supposed to stop controlling. 1 Quote Link to post Share on other sites
Ahmer 5 Posted October 24, 2018 Share Posted October 24, 2018 Its with in limit , it's better to check null TIT during starting may ur Null start TIT more then limit (780 to 810 c. ) 1 Quote Link to post Share on other sites
sharif101 11 Posted February 1, 2019 Share Posted February 1, 2019 At first U may ck NULL TIT,then Rich-Lean ck & also ck FCU rigging is perfect. 1 Quote Link to post Share on other sites
pjvr99 35 Posted February 2, 2019 Share Posted February 2, 2019 As a follow-up to this, we had one a few weeks back that actually went over a 1000°C before cutting back to 830 or so. Found the fcu schedule had shifted rich, adjusted CIT, and everything went back to where we expected it ..... Quote Link to post Share on other sites
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