UOA's and Engine Wear (again)

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I will never dispute that the common UOA can spot wear. Especially if you have a trend to watch. We use the simple tests for helicopter main transmission oil. Iron clearly shows up when wear is becoming a problem.

Here is a typical UOA from our heli main gearbox:

Iron 0.5, Copper 0, Nickel 0, Chromium 0, Silver 0 , Magn 0, Alum 0, Lead 0, Silicon 0.7, Titanium 0.2, Tin 0, Moly 0, H2O 1200.

In this case, when iron gets to about 15PPM, the gears are wearing abnormally.
 
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