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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:
J69-T-25/-25A
AIRCRAFT:
(T-37)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Abnormal Trend
(PPM Increase
8
3
4
4
3
4
in 10 hrs)*
Normal Range
0-8
0
0-1
0
0-7
0-2
Marginal Range
9-15
1-2
2-3
1-2
8-9
3-8
High Range
16-40
3-9
4-14
3-18
10-11
9-14
Abnormal
41+
10+
15+
19+
12+
15+
Average Concentration Other Elements:
Ni=1
Pb=13
Si=5
Sn=8
Ti=1
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.
Any T-37 oil sample that flames up in the oil analysis spectrometer will prompt the JOAP lab to place the engine
on code T (tear down). Fuel contamination of the oil will be reported to responsible activity when detected. Fe is
principal wear metal. Gradual increase in Fe near or to the abnormal value over a long period of time (several
hundred flying hours) is sometimes indicative of rotational movement of the No. 2 bearing. This rotational
movement, or creep, characteristic is normal and is a design feature of the No. 2 bearing. Rapid increases in Fe
are sometimes indicative of accessory drive gear shaft nut backing off because of a sheared tang on the nut lock.
Rapid increases in Al, to or exceeding abnormal value, can sometimes be attributed to improper stack up of the
engine resulting in rub of the No. 2 bearing labyrinth seal against the turbine shaft. When Cr approaches the
abnormal value, it is a possible indication of wear in the No. 2 bearing housing, or front and rear turbine shaft.
Increases in Ag are indicative of bearing wear and are usually in combination with high Fe and Cu. Increases in
Cu and Mg individually, or together, are an indication of problem in the accessory case section.
Fe
Main bearing balls/rollers and races
Starter generator and accessory drive gears
Accessory case gears
Fe
Al
Accessory oil pump
&
Cr
Fe
Ag
Cu
Accessory case bearings
&
Sn
Cu
Sn
Starter generator and accessory drive bearing cages.
Cu
&
Ag
Main bearing cages
Al
Mg
Accessory case housing and adapters

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