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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:
JT8D-9A (AIR FORCE ONLY)
AIRCRAFT:
(VC-9C/C-9A/T-43A, C-22A/B)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Ni
Si
Ti
Abnormal Trend
(PPM Increase
5
2
2
2
3
3
2
5
3
in 10 hrs)
Normal Range
0-15
0-3
0-5
0-3
0-5
0-5
0-3
0-16
0-5
Marginal Range (1)
16-19
4-6
6-7
4-6
6-7
6-7
4-5
17-24
6-7
High Range (2)
20-24
7-8
8-9
7-9
8-9
8-9
6-8
25-49
8-9
Abnormal (3)
25+
9+
10+
10+
10+
10+
9+
50+
10+
Average Concentration Other Elements:
Pb=2
Sn=6
(1) Reduce sampling interval by one-half.
(2) Resample each return to home station.
(3) Check main oil screen/filter for metal contamination; resample at every return to home station for 100
hours.
Fe
Nos. 1, 3, 4-1/2, 5 and 6 roller bearings and races,
No. 3 bearing spacer/gearbox drive bevel gear.
Nos. 2 and 4 ball bearings and races gearbox gears.
Fe
Al
Nos. 1 and 6 scavenge oil pumps.
Fe
Cu Ag
Main bearing wear
Gearbox bearings
Ag
Cu
No. 3 bearing cages
Ag
Cu Sn
Nos. 1, 2, 4, 4-1/2, 5 and 6 bearing cages
Fe
Al
Ag
Cu
Nos. 4, 4-1/2, and 5 scavenge oil pump
Fe
Al
Cr
Gearbox main oil pump
Al
Mg
Gearbox housing and adapter

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