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 NAVAIR 17-15-50.3
TM 38-301-3
T.O. 33-1-37-3
ENGINE:
T53-L-11/-13/-13B
AIRCRAFT:
(AH-1G)
JOAP ATOMIC EMISSION ROTRODE
Fe
Al
Cr
Cu
Mg
Si
Abnormal Trend
(PPM Increase
3
2
2
2
2
4
in 10 hrs)
Normal Range
0-6
0-1
0-1
0-2
0-3
0-15
Marginal Range
7
N/A
1
2
N/A
16-17
High Range
8-9
2
2
3
4
18-23
Abnormal
10+
3+
3+
4+
5+
24+
Average Concentration Other Elements:
Ni=1
Pb=1
Sn=8
Ti=1
Mo=1
Fe
Bearing
Speed reduction or accessory drive gearing, spacer, shims or splines
Fe
&
Cu
Fe
Ag
&
Cu
Main bearing or
Gear Assemblies
Fe
&
Mg
Accessory bearing lining and case
NOTES
1. Cr along with a sharp increase in Fe and oil consumption will be associated
with plating wear on carbon seal journals.
2. High Si indicates contamination probably due to sampling error.
OIL CAPACITY AND CONSUMPTION INFORMATION AIR FORCE REFERENCE MATERIAL ONLY
T.O. Reference: 1H-1(H)H-2-1, Paragraph 2-82
1. Oil capacity of engine is 3.0 U.S. gallons.
2. Allowable oil consumption rate (quantity per time) is 3 pints per hour.
3. Recommended oil consumption inspection interval (if appropriate for your engine): After every flight during
postflight inspection. Limit is 3 pints per hour.
4. Action to take if maximum allowable oil consumption is exceeded: Remove and repair engine at appropriate
level maintenance, if not return to Depot.
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