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 NAVAIR 17-15-50.3
TM 38-301-3
T.O. 33-1-37-3
ENGINE:
TF34-GE-100A (AIR FORCE ONLY)
AIRCRAFT:
(A-10)
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
0-2
0
0
0
0
0
0-2
Marginal Range
3-6
N/A
N/A
1
1
1
N/A
High Range
7-17
1-5
1-5
2-4
2-13
2-6
3-4
Abnormal
18+
6+***
6+
5+
14+
7+
5+
Average Concentration Other Elements:
Pb=4
Si=14
Sn=11
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.
See notes on page A-60.
**
***
High Ag by itself is not cause for rejection of the engine.
Fe
Accessory gearbox bearing housings
A-Sump scavenge pump rotor, vanes, and liners
No. 1 bearing housing
No. 1 and 3 bearings
Fe
&
Cr
Fuel pump drive spline
Fe
&
Ni
Cr
Power take-off assembly gears
Fe
&
Cr
Compressor forward shaft
Ni
Mo
Fe
&
Cr
Typical all main engine and accessory gearbox bearing races and balls/rollers
Mo
V
Fe
&
Ni
Ag
Nos. 2, 3, 4, 5, 6 and 7 main bearing cages
Fe
&
Cr
All main bearing rotating oil seals
Fe
&
Cr
Cu
Ni
Nos. 1, 2, 3, 4, 5, and 6 main bearing stationary oil seals
Nos. 1 and 2 main bearing housing
Power take-off assembly bearing housing
Al
Si
Front frame
Main lube and scavenge pump housing and port plates
A-Sump scavenge pump housing
Accessory gearbox housing
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