Oil leaking(drain point) in flight but ground run (30min full run) no leak.again leak after 15 min take off.visual check eng dry.its may be internal leak but i could not found.pls anyone can give idea.
During aircraft decent (landing)rpm fluctuate 99%-102%.normal flight rpm no fluctuate.td valve null,propeller mec gov position also fluctuate.tit,fuel flow,torque normal.
Anyone can give solution.