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Page Title:
INTERMEDIATE GEARBOX |
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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-60B, SH-60F, HH-60H, UH-60L
EH-60A, MH-60L, MH-60K, MH-60S, MH-60R AND VH-60N
INTERMEDIATE GEARBOX
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Mg
Ti
Cu
Abnormal Trend
(PPM Increase
9
3
3
9
3
9
in 10 hrs)
Normal Range
0-31
0-2
0-2
0-13
0-3
0-11
Marginal Range
32-44
3
3
14-24
4
12-21
High Range
45-50
4
4
25-32
5
22-29
Abnormal
51+
5+
5+
33+
6+
30+
Average Concentration Other Elements:
Si < 60 ppm
WATER LIMIT: 1,200 PPM or 0.120 percent
The intermediate gearbox has a self-contained splash-lube oil system without an oil filter. Normal wear particles
will continue to increase until the gearbox is drained and reserviced in accordance with the general aircraft
information manual.
All oil samples shall be checked for water content. Water limit: 1200 ppm or 0.120 percent. Water content that
exceeds 1500 PPM shall result in a laboratory recommendation of "J": change oil; sample after first flight. Water
content between 1200 and 1500 PPM shall result in a laboratory recommendation "C": do not change oil;
resample after first flight. If resample results in water content still above 1200 PPM, laboratory recommendation
shall be "J": change oil; sample after first flight. Water in the oil can lead to corrosion which will cause iron and/or
magnesium wear metals to appear in the oil analysis. The following supplementary information describes sources
of individual wear metals and recommended maintenance actions depending on contamination level and trend.
For the SH-60B, SH-60F, HH-60H, MH-60S, and MH-60R aircraft, contact MMHISST.1 at the Naval Air Depot,
Cherry Pt. For further information or clarification. For the UH-60A, UH-60L, EH-60A, MH-60L and MH-60K aircraft,
contact AMCOM Engineering, AMSAM-RD-AE-P. For the VH-60N aircraft, contact Sikorsky Aircraft Corporation.
NOTE
For SH-60B, SH-60F and HH-60H aircraft, a recommendation for immediate
maintenance before further flight may have serious impact and is to be issued only in
accordance with the instructions below. Any recommendation involving immediate
maintenance before further flight shall be accompanied by a priority naval message to
NAVAVNDEPOT Cherry Point NC, citing BuNo, operating activity, gearbox type, serial
number, oil analysis history, and recommendation.
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