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Page Title:
42 INTERMEDIATE GEARBOX (ARMY AND AIR FORCE ONLY) |
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 NAVAIR 17-15-50.3
TM 38-301-3
T.O. 33-1-37-3
CGTO 33-1-37-3
TH-1G, HH-1H
42 INTERMEDIATE GEARBOX (ARMY AND AIR FORCE ONLY)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Si
Abnormal Trend
(PPM Increase
12
4
2
7
10
15
in 10 hrs)
Normal Range
0-40
0-14
0-5
0-24
0-33
0-48
Marginal Range
41-49
15-17
6
25-29
34-40
49-59
High Range
50-61
18-21
7
30-36
41-49
60-74
Abnormal
62+
22+
8+
37+
50+
75+
Average Concentration Other Elements:
Fe
Bevel gears and bearing load surfaces
Fe
&
Cu
Bevel gears and bearing assembly
Fe
Cu
&
Al
Bearing assembly and liners
Fe
&
Al
Bearing liners in quill plate
Fe
Al
&
Mg
Gearing and case
NOTE
1. Tail rotor or drive line vibration may induce temporary high concentration of Fe, Cu
& Al.
2. Fe, Cu & Mg should be expected to increase sharply after extended periods of
inactivity because of corrosion.
3. Ag has been reported to occur in some gearboxes at very high levels. Silver in
these cases was used as a gear flashing to establish wear patterns for gear tracking
and should not be considered as a critical wear metal.
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