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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:
F118-GE-101
AIRCRAFT:
(U2S)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Ni
Si
Ti
Zn
Mo
Abnormal Trend
(PPM Increase
3
2
2
2
4
2
2
5
2
2
2
in 10 hrs)*
Normal Range
0-8
0-3
0-3
0-6
0-12
0-6
0-5
0-12
0-5
0-2
0-2
Marginal Range
9-11
4-5
4-5
7-8
13-16
7-8
6-7
13-15
6-7
3
3
High Range
12-13
6
6
9
17-19
9
8
16-19
8
4
4
Abnormal
14+
7+
7+
10+
20+
10+
9+
20+
9+
5+
5+
Average Concentration Other Elements:
*
If the calculated PPM trend value is equal to or greater than the trend PPM value limit, the engine has an
abnormal trend.
Fe
& Cr V
Mo
Typical all main engine, accessory gearbox and inlet gearbox bearing races and
balls/rollers
Fe
&
Ni Ag
All main engine, accessory gearbox and inlet gearbox bearing cages
Fe
&
Ni Cr
Gear/gearshafts in accessory gearbox and inlet gearbox
Cr
May be used on some bearing journals during rework - required on LP shaft
journals for Nos. 4 and 5 bearing and on HP shaft bore for No. 4 outer ring
Fe
&
Cr Ni
Cu
Frame lab seals, rotating lab seals and inlet gearbox housing
Fe
&
Cr
Carbon seal housings
Fe
Seal races, loose No. 3 bearing locking nut
Ti
Fan frame, sump housings (fwd and mid), fan and HPC shafts, No. 3 rotating air
seal
Ni
&
Cr Fe
Turbine frame and LPT shaft
Fe
&
Cu
Lube supply and scavenge pump
Fe
&
Cr Ni
Alternator rotor hub
Al
Alternator stator housing, accessory gearbox housing
Fe
&
Si
Alternator core laminations
Fe
&
Ti Ni
Loose No. 3 bearing locking nut
Fe
&
Ti
Loose No. 3 bearing locking nut, frame or shaft wear in forward or mid sump
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