sharif101 Posted January 8, 2012 Share Posted January 8, 2012 GOOD MORNING EVERYBODY When all four engine low speed at that time ATM did not haullt.engine low speed bleed pressure is 28.bleed air no leaking.even GTC (40psi) pressure did not hault ATM.replace new ATM but problem still. pls give idea THANKS Quote Link to comment Share on other sites More sharing options...
AMPTestFE Posted January 9, 2012 Share Posted January 9, 2012 Your english is worlds better than any other language I may speak, but I'm not sure of your problem. What it sounds like you might be asking... The ATM stops working when you downspeed all 4 engines? I have never been to DR. Congo, but I can take a guess that it is very hot. If you have both air conditioning systems on, you will probably have a problem with your ATM when all 4 engines are downsped. Try turning the cargo AC system off to increase the bleed air manifold pressure. Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted January 13, 2012 Share Posted January 13, 2012 So your ATM Gen will not hold (gen out light)? Start your GTC and then your ATM check your gen output and see if it is steady 400 hz 115 volts. (Do not place the ATM Gen ON at this time) If it is stable turn on the flight station A/C and see if it holds. Turn the flight station A/C off and Place the ATM gen ON and see if it holds. If it does turn the flight station A/C ON and see if it holds. You may have an "Under freq" condition that will cause the Gen to drop off line (gen out). This could be related to electrical load. Quote Link to comment Share on other sites More sharing options...
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