Originally Posted by
amzhkm147
The thing that we already do on the aircraft.
1) Calibration check on all NG, TQ, and T4 Gauge
2) Compressor replacement on No.2 engine
3) Turbine replacement on No.2 engine
4) Bleed valve replacement on No.2 engine
5) PTG replacement on No.2 Engine
6) FCU replacement on No.2 Engine
7) Engine fuel pump replacement on No.2 Engine
8) All Air pipelines have been replaced on No.2 Engine
9) Re-rig the NG adjustment for both Engine
Yet the problem is still there after I replace all the above-mentioned.
Since you have basically replaced all the normal engine components that cause this type problem, you may want to check the #1 and #2 engine wire harness and airframe indicating system wire harnesses for proper specifications. As mentioned above your #1 engine could be indicating low. Regardless, I would be 100% positive you have no indicating problem on the #1 and #2 engine indicating systems before replacing anymore components.
Was the #2 "T4" harness replaced when you replaced the #2 power turbine?