First of all I d like to thank you all about the usefull posts in this forum . Many times i found answers among your answers .
So now is my time to search about an opinion in a problem that seems out of Technical Publication . During the last months we faced continuous external leakage in propellers sometimes in between barrel s area and most often at blade lip s . In all cases .... we follow exactly inspections at teflon area , measurements in shank and teflon , bolts and barrel holes , even the build up measurements ....and so on . All the measurements and ispections founded according to Technical Publication .... ( for examble teflon strip over 5.560 till 5. 575 .... Build up close to 0,003 till 0,010 ... elongation between 11 to 13 or 14 sometimes ... using most sealant compound now in replace of putty ) . During the shop tests about external leak nothing noticed , even after repeatedly tested 2-3 times ..... but after some flight hours the prop appear with hyd leak in blades ... wich sometimes doesnt appear in shop when we received for examination ......
My Question is if any experiencing such a problem because i m really out of any solution ..... ( recently we faced the same problem even in newly O/H props ..... and nothing found even with the recent NDI /MPI check in barrel s area ) .
Thank in advance
