sharif101 Posted July 3, 2015 Share Posted July 3, 2015 After overhauled engine starting TIT 700 deg.Null start 760 deg then changed TD valve,Td calibaration ,All thermocouple checked and replaced new with T-block and harness,throttle rigging ck,blade angle ck,but problem still.all other throttle setting fuel flow, TIT,torque,RPM, are fine.perform rich lean check TIT drop 35 deg instant of 100 deg.Is it downstream burning or FCU faulty. takeoff TIT =977 FF= 2100,Torque=16500 inch lbscross over =760 Quote Link to comment Share on other sites More sharing options...
frank t Posted July 3, 2015 Share Posted July 3, 2015 sharif, theirs a pitot tube inside the intake of that engine that feeds outside air to your fuel control,make sure the plenum is connected properly, no kinks in the tubing, & obstruction free . sounds like your fuel control is getting it's air from inside the nacelle. did this engine go to the test cell before you hung it on the wing. good luck frank Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted July 21, 2015 Share Posted July 21, 2015 Is the TIT gage reading the same temp static? So if the OAT is 40C is the TIT gage reading 40C? Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted July 21, 2015 Share Posted July 21, 2015 You know, I've been thinking on this problem. While I dont know the -7 engine, most of it's problems appear tobe the same as -15. From time to time we get engines that start cooler than expected. During the compressorperformance check this usually shows up as a compressor above the median in NORMAL zone or even in theHIGH zone. Other things that can also affect the starting TIT are OAT and whether you are starting offa GTC/APU or an engine. A last possibility is the starter control valve is opening fully and not modulating airdelivery to the starter for a slower, regulated start Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted July 22, 2015 Share Posted July 22, 2015 Agree with the starter control valve possibility. What is the time to start? There should not be enough energy to make the engine start in a short period of time it should be at the upper limit. Quote Link to comment Share on other sites More sharing options...
sharif101 Posted July 26, 2015 Author Share Posted July 26, 2015 The problem with FCU. changed the FCU now everything finethanks to all Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted July 26, 2015 Share Posted July 26, 2015 ok good job Quote Link to comment Share on other sites More sharing options...
herky400M Posted August 7, 2015 Share Posted August 7, 2015 the pitot tube in the airintake have no influence in your starting sytem, unless you are living on a high altitude. Quote Link to comment Share on other sites More sharing options...
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