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 NAVAIR 17-15-50.3
TM 38-301-3
T.O. 33-1-37-3
CGTO 33-1-37-3
UH-60A
TRANSMISSION
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Si
Mo
Abnormal Trend
(PPM Increase
7
2
2
4
4
4
2
in 10 hrs)
Normal Range
0-25
0-2
0-2
0-10
0-13
0-13
0-2
Marginal Range
26-31
3
3
11-12
14-16
14-16
3
High Range
32-37
4
4
13-14
17-19
17-19
4
Abnormal
38+
5+
5+
15+
20+
20+
5+
Average Concentration Other Elements:
Ag < 1 ppm, N1 < 1 ppm, Pb < 1 ppm, Ti< 1 ppm
NOTES
Ag
-
Silver has been used in plating some splines and gears. When values
greater than 5 ppm are observed, a serviceability check should be requested.
Instructions for transmissions serviceability check are provided in TM 55-
1520-237-23-7.
Cr/Mo
-
Chromium and molybdenum should not be considered critical metals unless
iron is present in abnormal concentrations.
Mg/Al
-
Magnesium and aluminum are usually observed wherever corrosion exists.
However, when iron, magnesium, and aluminum are present in abnormal
concentrations, microscopic inspection of debris should be performed to
determine whether metal is due to wear or corrosion.
Si
-
The probable sources of silicon are contamination and anti-foaming agents in
lubricants. When the source of silicon is contamination, the component
should be drained, flushed, reserviced with new oil, and sampled after 5
hours of operation to assure removal of abrasive contaminants.
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