pjvr99 Posted April 24, 2019 Share Posted April 24, 2019 Hey guys Here's a problem that has me stumped. Engine starts up to LSGI (auto & null TIT peaks about 810°C). When upshift to NGI engine rpm is 95% and generator will not come on line. You need to manually reset ON or move throttle to speed up the engine. All engine parameters are good at all throttle settings, IBIT check good. Only GI/FL rpm is lower than usual, but not out of limit. Generator circuits check good, with all relays, control panel etc having been replaced, and even generator replaced. Any thoughts on this issue would be appreciated PJ Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted April 24, 2019 Share Posted April 24, 2019 Are these RPM numbers AUTOTAC RPM numbers or RPM Gage numbers? Quote Link to comment Share on other sites More sharing options...
Moeed hassan Posted April 24, 2019 Share Posted April 24, 2019 Have u checked compressor 5 and 10 stage blades.... Compressor washing may b required... Turbine boroscoping.... Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted April 24, 2019 Share Posted April 24, 2019 (edited) The Generator is "offline" below 95% as a function of the frequency sensitive relay so if the rpm is right at the limit to energize it may not, but the FSR relays are known to hold energized once above 95% to a number below 95% SOME say as low as 88% but I have never verified that number as it is impossible to dial down the rpm to 88% Edited April 24, 2019 by NATOPS1 Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted April 25, 2019 Author Share Posted April 25, 2019 Moeed, it is a zero time engine. NATOPS1, aircraft is glass cockpit, so I believe indicated rpm to be same as AUTOTACH. It does match generator frequency. Problem is what to do to get off that 95% GI rpm. Changing the engine only puts the problem on the ready line for the next time Quote Link to comment Share on other sites More sharing options...
Ahmer Posted April 25, 2019 Share Posted April 25, 2019 Hello pj , when u put the engine to normal ground idle, Gen frequency on frequency meter available at GEN switch on OFF position.? Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted April 25, 2019 Share Posted April 25, 2019 12 hours ago, pjvr99 said: NATOPS1, aircraft is glass cockpit, so I believe indicated rpm to be same as AUTOTACH. It does match generator frequency. Problem is what to do to get off that 95% GI rpm. Changing the engine only puts the problem on the ready line for the next time Ok got it. ANY pictures? (if allowed) Guess you can swap out the FSR maybe it has an issue or increase the GI/FI RPM closer to the upper limit. If you reset the gen will it go on line without speed increase? if you speed up the engine and get the generator on line will it stay online when slowing back to 95% Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted April 25, 2019 Author Share Posted April 25, 2019 2 hours ago, NATOPS1 said: Ok got it. ANY pictures? (if allowed) Guess you can swap out the FSR maybe it has an issue or increase the GI/FI RPM closer to the upper limit. If you reset the gen will it go on line without speed increase? if you speed up the engine and get the generator on line will it stay online when slowing back to 95% no pics, sorry. swapped out fsr, regulator and control panel - no change. silly question, i know, but ...... how do you adjust gi/fi rpm? yes it resets immediately, and will happily stay on line after that, even at low pitch stop of 93.some %. yes, fsr will drop it out below 365hz. fsr comes on line at 95.2/95.3% which is the advertized 385hz needed. propeller control is EPCS, so no messing with blade angles Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted April 25, 2019 Author Share Posted April 25, 2019 4 hours ago, Ahmer said: Hello pj , when u put the engine to normal ground idle, Gen frequency on frequency meter available at GEN switch on OFF position.? ahmer, this is the problem. we have 380hz/95%, but fsr needs 385hz to engage. fsr is working correctly. engine is also working correctly but too slow for fsr. Quote Link to comment Share on other sites More sharing options...
Ahmer Posted April 26, 2019 Share Posted April 26, 2019 9 hours ago, pjvr99 said: ahmer, this is the problem. we have 380hz/95%, but fsr needs 385hz to engage. fsr is working correctly. engine is also working correctly but too slow for fsr. Pj, if u change FSR ,AC cont panel and Generator. U should go to Replace FCU because there is no adjustment of GI & FI rpm if prop angle is with in limit. Regard Quote Link to comment Share on other sites More sharing options...
Moeed hassan Posted April 26, 2019 Share Posted April 26, 2019 Dear PJ have u fix the problem or still working on it?? If u have fixed it plz share it.. Thanx. Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted April 26, 2019 Author Share Posted April 26, 2019 I will certainly share if we can find a solution Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted May 2, 2019 Author Share Posted May 2, 2019 OK brand spanking new FCU and GI rpm is 96.2%. Still lower than what I'm used to seeing, but at least the FSR will engage the generator. Quote Link to comment Share on other sites More sharing options...
Moeed hassan Posted May 2, 2019 Share Posted May 2, 2019 Thats good.. Quote Link to comment Share on other sites More sharing options...
PauloFerreira Posted May 3, 2019 Share Posted May 3, 2019 23 hours ago, pjvr99 said: OK brand spanking new FCU and GI rpm is 96.2%. Still lower than what I'm used to seeing, but at least the FSR will engage the generator. Hi pjvr99, do you have adjusted the LSGI on FCU? Regards Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted May 3, 2019 Author Share Posted May 3, 2019 Not for this problem Paulo. I have previously had LOW SPEED GROUND IDLE rpm that was either to low or high. Low GROUND IDLE/FLIGHT IDLE rpm can not be adjusted on fcu. Quote Link to comment Share on other sites More sharing options...
PauloFerreira Posted May 10, 2019 Share Posted May 10, 2019 On 5/3/2019 at 2:48 PM, pjvr99 said: Not for this problem Paulo. I have previously had LOW SPEED GROUND IDLE rpm that was either to low or high. Low GROUND IDLE/FLIGHT IDLE rpm can not be adjusted on fcu. As you can see the Low Speed Ground Idle is Adjustable on the FCU. If you have the RPM's very low, you must adjust them between 96.3 and 99.1 for High Speed Ground Idle. When you adjust LSGI on FCU, it will increase the HSGI. Regards!! Quote Link to comment Share on other sites More sharing options...
Ahmer Posted May 11, 2019 Share Posted May 11, 2019 (edited) On 5/10/2019 at 6:42 PM, PauloFerreira said: As you can see the Low Speed Ground Idle is Adjustable on the FCU. If you have the RPM's very low, you must adjust them between 96.3 and 99.1 for High Speed Ground Idle. When you adjust LSGI on FCU, it will increase the HSGI. Regards!! Hi dear paulo, LSGI RPM is 75% & NGI RPM is 95% , what will be ur decision in this situation. How we increase NGI RPM ? Regards Edited May 11, 2019 by Ahmer Quote Link to comment Share on other sites More sharing options...
PauloFerreira Posted May 13, 2019 Share Posted May 13, 2019 On 5/11/2019 at 6:59 PM, Ahmer said: Hi dear paulo, LSGI RPM is 75% & NGI RPM is 95% , what will be ur decision in this situation. How we increase NGI RPM ? Regards Dear Ahmer, is a relation of speed and fuel! More rotation on the Flying Weights of FCU, than more fuel added on both situations! Regards! Quote Link to comment Share on other sites More sharing options...
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