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NAVAIR 17-15-50.3
TM 38-301-3
T.O. 33-1-37-3
CGTO 33-1-37-3
H-3
42 INTERMEDIATE GEARBOX (NAVY ONLY)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Abnormal Trend
(PPM Increase
13
3
8
8
in 10 hrs)
Normal Range
0-43
0-10
0-27
0-27
Marginal Range
44-53
11-12
28-33
28-33
High Range
54-63
13-15
34-40
34-40
Abnormal
64+
16+
41+
41+
Average Concentration Other Elements:
WATER LIMIT: 1,000 ppm on 0.100% (if equipment is available at lab)
Water in the oil could cause high iron, copper, magnesium or aluminum due to corrosion. If high or abnormal wear
metals are obtained and high water is detected on two consecutive samples, the laboratory recommendation may
be to flush gearbox, reservice and perform serviceability check. Info CFA when recommending flushing.
NOTE
Special samples may be recommended anytime unusual readings are obtained.
High metal readings without high water may result in a laboratory recommendation for flushing or removal of a
gearbox. A minimum of two consecutive high readings is required prior to recommending flush or removing a
gearbox unless other evidence (chiplights, fragments, unusual noise, etc.) is found. Info CFA when
recommending flushing. CFA concurrence is required prior to a recommendation for gearbox removal due to high
readings. Furnish CFA with 5 previous NOAP readings when recommending gearbox removal.

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