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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:
J85-GE-21/-21B/-21C (Navy)
AIRCRAFT:
(F-5E/F)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Ti
Abnormal Trend
(PPM Increase
10
2
2
3
3
4
3
in 10 hrs)*
Normal Range
0-16
0-1
0-1
0-1
0-1
0-3
0-2
Marginal Range
17-38
2
2
2
2
4-9
3
High Range
39-49
3
3
3
3
10-15
4
Abnormal
50+
4+
4+
4+
4+
16+
5+
Average Concentration Other Elements:
Ni=1
Pb=2
Si=3
Sn=7
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 Ag
alone indicated fuel contamination of lube system; recommend inspection of fuel oil cooler and/or fuel pump.
Fe
PTO shaftgear bearing shim
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
&
Ti
Cr
No. 1 bearing inner race and carbon seal runner (-21)
No. 1 bearing compressor rotor front shaft (-21 only)
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