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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:
TF30-P-414A (Navy Only)
AIRCRAFT:
(F-14A)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Ni
Ti
Abnormal Trend
(PPM Increase
4
3
3
3
4
3
4
in 10 hrs)
Normal Range
0-16
6
0-3
0-6
0-16
0-6
0-11
Marginal Range
17-20
7-8
4
7
17-20
7
12-13
High Range
21-24
9
5
8-9
21-24
8-10
14-16
Abnormal
25+
10+
6+
10+
25+
11+
17+
Average Concentration Other Elements:
Pb=10
Ag=2
Si=10
Sn=10
Teardown evaluations have identified the following areas to be most probable cause for certain wear metal
indicators: Fe-main engine bearings, Mg-main gearbox, Ti-No. 2 bearing housing. Ag, Pb, Cu, Si individually are
not cause for engine removal.
NOTE
Trend analysis is the best evaluation of engine condition. It is recommended that lab results be
plotted on graphs to assist in evaluations. Engines which show no abnormal trend may reach the
abnormal range until removal is recommended. Engines which show abnormal trend should be
resampled for verification ASAP and evaluated using "Decision Making Guidance" table. Trend
should always be based on ppm increase per 10 hour interval. Samples which show a significant
drop in all wear metal (negative trend) should be resampled for verification ASAP and if confirmed a
new oil baseline established by sampling every 5 hours for next 3 samples. Trend analysis done
with less than 5 hours between samples are subject to error because the spectrometer tolerance of
1 ppm is averaged in the shorter time interval. Flushing oil system will not be accomplished unless
an external contamination source can be identified.
Fe
Main bearing ball/roller, races; Pump gears;
Accessory drive shaft; Gearbox gears shaft and splines
Ag
Cu
Main, accessory, gearbox bearing cages
Al
Gearbox oil pump housing; Nos. 4 and 5 scavenge pump housing
Fe
Cr
Nos. 2, 3, and 4 bearing seal plates
Mg
No. 1 bearing housing; Gearbox housing
Ti
Nos. 2 and 3 bearing support housing
Ti
&
Fe
Cr
Mo V
Fan forward shaft spline wear or No. 1 or No. 2 bearing loose or fan forward shaft
Ni
Nos. 4-1/2 and 5 bearing seal liner
No. 5 bearing compression springs
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