trev130eng Posted October 20, 2010 Share Posted October 20, 2010 Got a problem with an engine recently back from overhaul giving fumes through the a/c at take off power. This only happens on take off or touch and goes, i cannot reproduce the fault with a full power ground run. There is no oil leaks on the engine and it is not consuming oil. I suspect a faulty spray pattern from a secondary fuel nozzle but i can't change the fuel nozzles at the moment because the customer only has 5 spare and no test facility. When i was asked why a fuel nozzle can cause this problem because it is downstream of the compressor and bleed valve i had to admit i don't why but it happens. Also the tech manual says to replace the nozzles. Can anybody give me an explanation for this or a tech manual reference why a fuel nozzle can give fumes? Write up of the week: Can i pls check out the accelerometer on the Pilot's instrument panel because it keeps reading 1 and will not go to zero when the reset button is pressed! Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted October 20, 2010 Share Posted October 20, 2010 Trev, If the nozzle is coked or damaged in some way, the fuel blows back through the nozzle. It is a shroud that allows air to mix with the fuel before injecting into the combustion can. This 'blowback' occurs in the diffuser, and therefore easily taken into the 14th stage bleed ducts Invert aircraft - error will go away :rofl: Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted October 20, 2010 Share Posted October 20, 2010 What kind of fumes? Fuel, Oil or Hyd smell? Any leakage can blow back as pjvr posted. See pic. Maybe try a "Rapid" power application (as in a Touch andGo) and see if you can duplicate. Quote Link to comment Share on other sites More sharing options...
Dan Wilson Posted October 21, 2010 Share Posted October 21, 2010 Write up of the week: Can i pls check out the accelerometer on the Pilot's instrument panel because it keeps reading 1 and will not go to zero when the reset button is pressed! Well I guess you could tell him to get to 200,000 feet or so and it should read zero. College educated idjuts abound. Quote Link to comment Share on other sites More sharing options...
tenten Posted October 21, 2010 Share Posted October 21, 2010 Trev, Have you checked Fuel Heater and Strainer for evidence of mixing oil with fuel? Quote Link to comment Share on other sites More sharing options...
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