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T56 GUY

Crossover TIT Correction

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Has anyone ever experienced crossover TIT going to 900 lights out and correcting between 800-840 degrees?

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Hi there, have you used the T.D. amplifier test? check the T.D. valve , values. Similar malfunction yesterday changed the T.D. valve.

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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

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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.

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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. )  

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At first U may ck NULL TIT,then Rich-Lean ck & also ck FCU rigging is perfect.

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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 .....

 

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