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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:
J60-P-3/-5 (AIR FORCE ONLY)
AIRCRAFT:
(T-39)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Ni
Ti
Abnormal Trend
(PPM Increase
7
3
3
3
4
5
3
in 10 hrs)*
Normal Range
0-14
0-1
0-3
0-4
0-4
0-10
0-5
Marginal Range
15-21
2-7
4-6
5-7
5-7
11-15
6-7
High Range
22-34
8
7-11
8
8-14
16-24
8-9
Abnormal
35+
9+
12+
9+
15+
25+
10+
Average Concentration Other Elements:
Ni=0.5
Pb=1.5
Si=1.6
Sn=6.8 Ti=1
Mo=0.7
*
If the calculated PPM trend value is equal to or greater than the trend PPM value limit, the engine has an
abnormal trend.
When Fe increases in combination with an increase in Mg, the discrepancy is usually with the accessory gear
case. When Fe increases in combination with an increase in Cu, the discrepancy may be a main shaft bearing,
usually No. 3. High Fe, Cu and Mg in combination usually indicate discrepancy with the tower shaft bearing.
Increases in Mg by itself indicate defect in accessory gear case. Fuel contamination of oil indicates rupture of
fuel oil cooler.
NOTE
High lead concentrations alone in J60 engine used oil DO NOT warrant engine
removal and repair actions. Lead plating on No. 1 bearing, P/N 410787, is source
of lead.
Fe
Main bearing balls/rollers and races
Gearbox gears
Fe
Al
Pressure and scavenge oil pump
Fe
Ag
Cu
&
Si
Sn
Ag
Cu
&
Main bearing cages
Si
Sn
Al
Mg
Gearbox housing and adapters
Ti
Compressor rotor front hub
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