aziizurrahman Posted August 16, 2014 Share Posted August 16, 2014 HI GUYS. VERY GOOD EVENING. IM FACING A DEFECT NO 1 ENGINE RPM INDICATOR NIL INDICATION DURING START UP ( FROM 0% DIRECTLY JUMP TO 22% RPM) WITH OTHERS ENGINE INSTRUMENTATION NORMAL. WE ALREADY DID THE RECTIFICATION BY SWAP AND REPLACE INDICATOR, REPLACE ECTM CONVERTER REPLACE 3 X TACHOGNY REPLACE VALVE HOUSING WIRING CX ON THE SYSTEM DO YOU GUYS HAVE ANY IDEAS ON THIS DEFECT?? Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted August 16, 2014 Share Posted August 16, 2014 Aziz Did you check TIT & torque on this event if indicated fix the techo on RGB other position on RGB pad or SSC. Regards all budoo Munir Abbasi Home of hercules pakistan Quote Link to comment Share on other sites More sharing options...
aziizurrahman Posted August 16, 2014 Author Share Posted August 16, 2014 Mr munir.can you explain more detail.i cant get your idea.sorry boss. Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted August 17, 2014 Share Posted August 17, 2014 Mr Azizurrehmman, are you know there are three pad for tacho meter generator, 2 on RGB ,one on speed sensitive control on left side of engine. normally this problem occurs due to tachometer generator shear shaft or RGB drive problem. if you have done these rectification. than there is TB on electrical control supply rack where power is distributed to sysnchrophaser & RPM indicator. more you check tacho generator out put on connector Apex 21.5 volt phase to phase or neutral because delta connection. i hope you can trouble shooting to this problem. Regards Munir abbasi Retired Home of hercules pakistan Quote Link to comment Share on other sites More sharing options...
aziizurrahman Posted August 17, 2014 Author Share Posted August 17, 2014 Hi mr munir..actually we have replace a new engine.but not because of that defect.but the defect is still persist.hence we replace a synchrophaser unit.EGR and found satisfactory.so the problem is from the synchropfhaser unit.thanz again mr munir abbas for your kind response and ideas.. Quote Link to comment Share on other sites More sharing options...
tinyclark Posted August 18, 2014 Share Posted August 18, 2014 It always helps to list what year aircraft you are referring to. There are so many different wiring diagrams. Quote Link to comment Share on other sites More sharing options...
M Ahsanul Haque Mukul Posted February 25, 2021 Share Posted February 25, 2021 Hello sir...rpm nil during starting and it jumps to normal ops when releasing the break for takeoff run. I've checked the contunity between ind and techo plug found normal. Techo gen swapped with svc one. Also rpm ind swapped but prob remains same. Quote Link to comment Share on other sites More sharing options...
Jcapsparkchaser Posted February 26, 2021 Share Posted February 26, 2021 On 8/17/2014 at 11:30 PM, tinyclark said: It always helps to list what year aircraft you are referring to. There are so many different wiring diagrams. TC , Ive seen this happen before in 63 year "E" models 637867 to be exact QEC on specified engine installed after returning from Texas solder job at cannon plug at Tach Generator not tinned and only held on by a couple strands of wire also look at cannon Plug by indicator in cockpit another area where a lot of hands get in there swapping indicators and pulling on the harness. Quote Link to comment Share on other sites More sharing options...
M Ahsanul Haque Mukul Posted February 27, 2021 Share Posted February 27, 2021 On 2/26/2021 at 5:18 AM, Jcapsparkchaser said: TC , Ive seen this happen before in 63 year "E" models 637867 to be exact QEC on specified engine installed after returning from Texas solder job at cannon plug at Tach Generator not tinned and only held on by a couple strands of wire also look at cannon Plug by indicator in cockpit another area where a lot of hands get in there swapping indicators and pulling on the harness. It was C-130B ac and You are right. That was harness problem. Now ops normal. Thank you sir. Quote Link to comment Share on other sites More sharing options...
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