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NAVAIR 17-15-50.3
TM 38-301-3
T.O. 33-1-37-3
CGTO 33-1-37-3
SH-2G
MAIN GEARBOX (NAVY ONLY)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Ni
Ti
Abnormal Trend
(PPM Increase
17
4
6
10
6
6
in 10 hrs)
Normal Range
0-60
0-12
0-20
0-18
0-18
0-18
Marginal Range
61-70
13-15
21-25
19-22
19-22
19-22
High Range
71-86
16-17
26-30
23-26
23-26
23-26
Abnormal
87+
18+
31+
27+
27+
27+
Average Concentration Other Elements:
WATER LIMIT: 1,000 ppm on 0.100% (if equipment is available at lab)
The main gearbox shares a common oil system with the combining gearbox with oil
filters both in the oil pump and in the scavenge oil return line. Normal wear particles will
continue to increase until the gearbox is drained, flushed and reserviced in accordance
with NAVAIR 01-260HCD-2-4.1. Water in the oil will cause high iron and magnesium
because of corrosion. When high or abnormal wear metals are detected and/or the
water content of the oil exceeds 1,000 ppm (0.100%)*, the laboratory recommendation
should be "flush gearbox, reservice and perform serviceability check in accordance
with NAVAIR 01-260HCD-2-4.1. Submit oil sample after serviceability check and
special oil sample after 10 flight hours of operation for both wear metals and water
content."
*Water content check dependent on special equipment availability.
High metal readings without exceeding 100 ppm water content may result in a
laboratory recommendation for flushing or removal of the gearbox. A minimum of two
consecutive high readings is required prior to recommending flushing or gearbox
removal unless secondary indications (chips, unusual noise, etc.) are present. Inform
CFA  when  recommending  flushing.  CFA  concurrence  is  required  prior  to
recommending gearbox removal. Furnish CFA with five previous NOAP readings when
recommending gearbox removal. CFA is NOAP readings when recommending gearbox
removal.

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