Badiul Alam Posted June 19, 2020 Share Posted June 19, 2020 Hey Herk friend. One of my Eng/ prop rpm increases upto 105% during opening pwr with freq and then comes to 100% after 6-7 sec with freq 400 Hz. When rpm increases to 105%, then TIT remain 750-800(-7B). After reaching 100% rpm, TIT starts rising. Again while retarding throotles back to Flt Idle, rpm comes to 95-94%( on grd) and 96-97% in flt, then increases slowly with freq. That is in Normal, mechgov and synchro mode. We have replaced VH, FCU, TD Valve,TD amp but no joy. Any suggestions pl. Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted June 20, 2020 Share Posted June 20, 2020 bad valve housing, or internal leak from dome seals, pitchlock regulator, or prop retaining nut seals Quote Link to comment Share on other sites More sharing options...
Lkuest Posted June 20, 2020 Share Posted June 20, 2020 Only thing I would add to pjvr99's response is consider resealing the low pitch stop too. I'd almost bet money the squeal check would fail. Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted June 21, 2020 Share Posted June 21, 2020 23 hours ago, Lkuest said: Only thing I would add to pjvr99's response is consider resealing the low pitch stop too. I'd almost bet money the squeal check would fail. yes, forgot about lps Quote Link to comment Share on other sites More sharing options...
Badiul Alam Posted June 25, 2020 Author Share Posted June 25, 2020 On 6/20/2020 at 9:09 AM, pjvr99 said: bad valve housing, or internal leak from dome seals, pitchlock regulator, or prop retaining nut seals Thanks. We have replaced VH and now all SAT. 1 Quote Link to comment Share on other sites More sharing options...
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