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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-53
INTERMEDIATE GEARBOX (NAVY ONLY)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Abnormal Trend
(PPM Increase
14
4
6
in 10 hrs)
Normal Range
0-46
0-13
0-20
Marginal Range
47-56
14-16
21-25
High Range
57-69
17-19
26-30
Abnormal
70+
20+
31+
Average Concentration Other Elements:
Water Limit: 1,000 ppm or 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
recommendations may be to drain 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 flushing or removing
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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