Can someone give me some insight on what would be the best oil to use in a Hiller UH-12E? Long time Hiller operators tell me that the approved oil in the T/R gearbox is junk and in fact attracts moisture. Very few hours after an annual inspection was performed, the T/R gearbox oil started to look cloudy, so I drained and replaced it. I'm hoping to find a solution that I can standardize and run the same oil in the main and t/r transmission, along with the cuff and trunnion. Something that meets or exceeds the milspec and can be legally ran in the aircraft. I appreciate the advice and help.
Last edited by SL12572
on Fri Jun 11, 2010 2:18 am, edited 1 time in total.