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 NAVAIR 17-15-50.3
TM 38-301-3
T.O. 33-1-37-3
CGTO 33-1-37-3
ENGINE:
O-480
AIRCRAFT:
(U-4)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Abnormal Trend
(PPM Increase
21
2
9
20
10
4
in 10 hrs)
Normal Range
0-72
0-3
0-30
0-65
0-33
0-14
Marginal Range
73-88
N/A
31-37
66-80
34-40
15-17
High Range
89-109
4
38-44
81-99
41-49
18-21
Abnormal
110+
5+
45+
100+
50+
22+
Average Concentration Other Elements:
Ni=2
Pb=900
Si=6
Sn=4
Ti=2
Mo=1
High A1 and/or Fe may indicate trouble in rocker boxes. Valve springs may be cutting into retainers, or thrust
washers on rocker shaft may be wearing into side of rocker box.
Fe
Cu
Bearing wear
Fe
Cr
Al
Rings, Piston, Cylinder wear
NOTE
O-series engines are "wet sump" (oil pan) type engines and oil tank capacity is small.
This causes tendency for sample contamination. Frequent oil change interval (25-50
hours) must also be considered when evaluating JOAP results.
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