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NAVAIR 17-15-50.3
TM 38-301-3
T.O. 33-1-37-3
CGTO 33-1-37-3
MH-60A/UH-60L/MH-60L/MH-60K (U.S. ARMY ONLY) (Cont.)
TAIL ROTOR GEARBOX
f.  Silver (Ag) - Silver is used as plating on the input pinion and output gear splines. Presence of silver wear
particles usually indicates spline wear is occurring. Performance of torque checks on the nuts/bolts connecting the
input flange/inboard retention plate to the gearbox is used to determine if wear of these splines is present. See
also paragraphs 6c and 6d below.
g. Chromium (Cr) - Chromium is present in some steels, and as a plating on the input/output seal wear
sleeves. The presence of chromium wear particles may indicate wear of the seal sleeves, which would be
detected through excessive seal leakage.
h. Silicon (Si) - Silicon should be monitored due to its potential for causing abrasive wear inside the gearbox.
Usual sources are contamination from dirt and sand, or from silicon-based grease through the pitch control shaft
seal. Drain and flushes are recommended for silicon levels over 100 ppm.
Table A-3. Element Sources
Element
Component
Source
Fe (Iron)
Input Pinion
Wear with gear.
Output Gear
Wear with pinion.
Bearing Rollers,
Rolling Wear
Races, Cages
Pitch Change Shaft
Wear with gear ID.
Al (Aluminum)
Input Pinion Plug
Corrosion.
Input Flange1
Seal Wear.
Inboard Retention
Spline Wear.
Plate 1
Split Cones1
Wear  with  gear
and
Pitch Control Shaft
retention plate.
Bushing1
Wear with gear ID.
Ti (Titanium)
Input Flange
Seal wear.
Inboard Retention
Spline wear.
Plate
Mg (Magnesium)
Housings.
Corrosion.
Oil Spiral.
Corrosion.
Cu (Copper)
Split Cones.
Wear  with  gear
and
Pitch Control Shaft
retention plate.
Bushing
Wear with gear ID.
Input Pinion1
Ag (Silver)
Spline wear.
Output Pinion1
Spline wear.

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