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NAVAIR 17-15-50.3
TM 38-301-3
T.O. 33-1-37-3
CGTO 33-1-37-3
CH-34C
TAIL ROTOR GEARBOX
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Si
Abnormal Trend
(PPM Increase
12
2
5
4
4
4
5
in 10 hrs)
Normal Range
0-40
0-3
0-19
0-12
0-11
0-11
0-18
Marginal Range
41-50
N/A
20-23
13-15
12-13
12-13
19-22
High Range
51-61
4
24-28
16-17
14-16
14-16
23-26
Abnormal
62+
5+
29+
18+
17+
17+
27+
Average Concentration Other Elements:
Fe
Fe
&
Cu
Bearings and races
Fe
&
Mg
Bearing liner rotating in housing
Fe
&
Al
Bearing rotating in quill housing
NOTE
1. High concentration of Fe & Mg could also indicate corrosion due to moisture in the
system.
2. High concentration Si indicates contamination probably due to sand and dirt or
silicon rubber parts or presence of anti-foaming additive.
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