sharif101 Posted November 7, 2012 Share Posted November 7, 2012 7b engine during #4 eng start rpm raise 60% and when start button release at that time rpm decrease with td auto and null,tit 700 degree.,grd idle blade angle 5 degree.please give me any solution. Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted November 7, 2012 Share Posted November 7, 2012 Inspect your turbine Adjust your TD valve to full increase If at full increase change your fuel control (or adjust if you are allowed) Quote Link to comment Share on other sites More sharing options...
sharif101 Posted November 13, 2012 Author Share Posted November 13, 2012 faulty TD valve.TD valve replace problem solved Quote Link to comment Share on other sites More sharing options...
tusker Posted November 13, 2012 Share Posted November 13, 2012 Good day guys.............Tell me!!.....I was going to say change FCU......how can you get this snag with the TD system in null?...................I must have been away from it for too long now!! Quote Link to comment Share on other sites More sharing options...
Lkuest Posted November 14, 2012 Share Posted November 14, 2012 Good day guys.............Tell me!!.....I was going to say change FCU......how can you get this snag with the TD system in null?...................I must have been away from it for too long now!! The TD valve brake is de-energized engaged. When the brake breaks, it locks the fuel correction in whatever position the TD Amp wants to take it or put it to. After a null adjustment, the adjustment richens or leans the fuel mixture, which the TD Amp tries to correct for it in the controlling range. While the amp corrects, the brake slips a bit, like a clutch, which re-tunes the rich/lean back to where it was before adjustment. I've seen this problem quite a few times. It's actually a fairly common failure mode of the TD Valve due to the nature of the brake being engaged when it is de-energized (broken), but the trim motor still works to attempt corrections. Quote Link to comment Share on other sites More sharing options...
tusker Posted November 14, 2012 Share Posted November 14, 2012 Do you think they had indications of engine fuel problems during the last flight!! Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted November 15, 2012 Share Posted November 15, 2012 TD valves get stuck in TAKE position I get a lot of those Quote Link to comment Share on other sites More sharing options...
Steve1300 Posted November 16, 2012 Share Posted November 16, 2012 Would a yellow box check for the put and take reactions times show the problem? Since the brake failed and is locked (stuck) will the 14 second check demonstrate the need for a new valve? Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted November 16, 2012 Share Posted November 16, 2012 TD valves get stuck in TAKE position I get a lot of those It's pretty common... That’s why the first thing we do is "adjust" the TD Valve with a mallet.... I've never had to do this but my best engine guy swears you make the TD valve fix itself by making it think it is above 94% (ssc cannon plug off, 94% switch open) and put the throttle in the temp controlling range you can "Make" the TD valve go to full put (with an adjustment, maybe?) It should work all the inputs would signal an increase in fuel flow.... Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted May 29, 2014 Share Posted May 29, 2014 change the FCU or adjust the TD valve MUNIR PAF ATI Quote Link to comment Share on other sites More sharing options...
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