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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
TAIL ROTOR GEARBOX (NAVY ONLY)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Abnormal Trend
(PPM Increase
17
4
6
10
in 10 hrs)
Normal Range
0-60
0-12
0-20
0-18
Marginal Range
61-70
13-15
21-25
19-22
High Range
71-86
16-17
26-30
23-26
Abnormal
87+
18+
31+
27+
Average Concentration Other Elements:
WATER LIMIT: 1,000 ppm on 0.100% (if equipment is available at lab)
The tail rotor gearbox has a self-contained gearbox without an oil filter. 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 either high iron
and copper or high iron, copper, magnesium and aluminum because of corrosion.
When high or abnormal wear metal readings are obtained, check the oil for water
content. If high or abnormal wear metals are detected and/or the water content of the
oil exceeds 1,000 (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 1000 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.

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