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Page Title:
90 TAIL ROTOR 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
90 TAIL ROTOR GEARBOX (ARMY AND AIR FORCE ONLY)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Si
Abnormal Trend
(PPM Increase
26
10
4
26
15
20
in 10 hrs)
Normal Range
0-85
0-35
0-10
0-85
0-48
0-65
Marginal Range
86-105
36-43
11-12
86-105
49-59
66-80
106-
106-
60-74
81-99
44-52
13-15
High Range
129
129
Abnormal
130+
53+
16+
130+
75+
100+
Average Concentration Other Elements:
Ni=1
Pb=1
Sn=14
Ti=5
Mo=3
Fe
Bevel gears and bearing load surfaces
Fe
Cu
&
Al
Bearing assembly and liners
Fe
&
Al
Bearing liners in quill plate
Fe
Al
&
Mg
Gearing and case
NOTE
1. Temporary high concentration of Fe, Cu and Al may result from tail rotor or drive
line vibration.
2. The concentration of Fe, Al & Mg should be expected to increase sharply after
extended periods of inactivity because of corrosion.
3. High concentration of Fe, Cu & Mg may result from excessive lubrication of tail
rotor cross head bearing forcing grease and external debris into contact with gearbox
oil. Flushing overcomes the problem but requires a 10 minute ground operation
following each drain and reservice.
4. Inspect the aluminum wool in the filter cap for deterioration when excessive
aluminum wear metal is detected in oil samples.
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