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NAVAIR 17-15-50.3
TM 38-301-3
T.O. 33-1-37-3
ENGINE:
J85-GE-5/-13
AIRCRAFT:
(T-38) (F-5)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Abnormal Trend
(PPM Increase
10
2
2
3
3
4
in 10 hrs)*
Normal Range
0-10
0
0-1
0
0-1
0-3
Marginal Range
11-28
1-2
2-3
1-2
2-4
4-10
High Range
29-49
3-6
4-7
3-8
5-11
11-21
Abnormal
50+
7+
8+
9+
12+
22+
Average Concentration Other Elements:
Ni=1
Pb=2
Si=4
Sn=8
Ti=1
Mo=1
*
If the calculated PPM trend value is equal to or greater than the trend PPM value limit, the engine has an
abnormal trend.
No. 2 main bearing is a major problem area detectable by JOAP. These failures usually occur rapidly. Maintain
close surveillance even when small increases in Fe are noted. High Fe and Cu (with/without Ag) indicate main or
accessory bearing defect. Suspect first, No. 3 and No. 2 main bearings; next, Axis "E" accessory bearing. High Fe
is also frequently due to defect in gearbox Axis "B" bearing. High Ag alone may indicate fuel contamination of lube
system; recommend inspection of fuel oil cooler and/or fuel pump. Fuel contamination can also occur without
significant Ag present and is detectable by sample odor.
Fe
&
Ni
No. 1 bearing races
Fe
&
Cr
No. 1 bearing rollers and front frame casing
Nos. 2 and 3 bearing support
Accessory drive gearbox and PTO bearing balls/rollers and races
Accessory drive gearbox seal and bearing housings
Fe
&
Cr
Ni
Gearbox bearing spinning in liners, PTO scavenge tube
Main bearing carbon seal runners
No. 1 bearing compressor rotor front shaft
No. 2 bearing locknut and compressor driveshaft
No. 3 bearing locknut and turbine wheel shaft
PTO radial driveshaft, bevel gears, bearing housing, axial bearing support and
retainer
Accessory lube and scavenge pump spur gear, lube filter and oil cooler valve
Accessory drive gearbox shaft and bevel gears
Fe
&
Cr
Accessory drive gearbox gear locknut
Ni
Si
Fe
&
Cr
PTO and No. 2 bearing retainer

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