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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:
F108-CF-100GE
AIRCRAFT:
(KC-135R)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Ni
Ti
Abnormal Trend
(PPM Increase
4
2
2
2
3
2
2
in 10 hrs)
Normal Range
0-9
0-3
0-2
0-2
0-7
0-3
0-2
Marginal Range
10-13
4
3
3
8-10
4
3
High Range
14-17
5
4-5
4
11-12
5
4
Abnormal
18+
6+
6+
5+
13+
6+
5+
Average Concentration Other Elements:
Fe
Nos. 1 and 2 main bearings
Fe
Ag
Nos. 4 and 5 main bearings
Fe
Cu
Ag
Ti
No. 3 main bearing (Ti hub)
Al
Transfer gearbox, accessory gearbox, and lube pump housings
Fe
Cu
Ag
Transfer gearbox and accessory gearbox bearings
Fe
Ag
Gears/gearshafts in transfer/accessory gearboxes
Fe
Lube gears/shafts
Cr
May be used on some bearing journals during overhaul
1. A sudden increase (10-12 ppm) of Fe or an increase (5-7 ppm) of Fe in conjunction with an indication
(2 ppm) of Cu can indicate main bearing distress. The No. 3 bearing is the only main bearing with
significant copper. Small amounts of Ag may accompany the Fe or Fe and Cu.
2. A moderate increasing trend of Fe may indicate excessive spline wear on the IGB horizontal shaft
spline.
3. For a confirmed significant (4-5 ppm) Ti reading, the No. 3 bearing inner race is turning on the hub.
4. Lube and scavenge pump bearing distress may be indicated by trends in Fe and Cu together. Al may
accompany the Fe and Cu.
5. Increasing trends in Fe may indicate gearbox problems. Al, Cu and Ag wear metals may accompany
the increase in Fe.
6. Cr may be used for rework of main bearing journals and gearbox bearing journals. Increasing Cr may
indicate inner race spinning on the journals except No. 3 bearing.
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