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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:
T400-CP-400 (AIR FORCE)
AIRCRAFT:
(UH-1N)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Abnormal Trend
(PPM Increase
4
3
3
2
2
2
in 10 hrs)*
Normal Range
0-2
0
0
0
0
0
Marginal Range
3-5
N/A
1
N/A
1
1
High Range
6-14
1-7
2-9
1-3
2-7
2-5
Abnormal
15+
8+
10+
4+
8+
6+
Average Concentration Other Elements:
Ni=1
Pb=1
Si=6
Sn=9
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.
Increases in Fe and Ag may be indicative of discrepancy in No. 5 bearing area if sample is taken from power
section oil system. Increases in Fe in the third oil system may indicate a discrepancy in the clutch area.
Fe
Cr
Power turbine rotor shaft, Nos. 1, 2, 3, and 4 bearing balls, rollers and races,
compressor shaft, compressor air/oil seal, accessory gearbox bearing balls, rollers
and races, reduction gearbox bearing balls, rollers and races.
Fe
Ni
Power turbine rotor shaft, compressor rotor shaft, air rotor seal, No. 1 bearing
cage.
Fe
Ni
Cr
Accessory gearbox gears and shafts, accessory gearbox oil pump gears
and shafts.
Fe
Cu
Mg
Si
Accessory gearbox housings, accessory gearbox oil pump housings, reduction
gearbox housings, reduction gearbox oil pump housing and cover.
Cu
Si
Zn
Fe
Ag Nos. 2, 3, and 4 bearing cages, accessory gearbox bearing cages, reduction
gearbox bearing cages.
Al
Si
Ni
Cu
Reduction gearbox sleeve bearings.
Al
Cu
Mg
Reduction gearbox carrier oil seals
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