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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, MH-60S, MH-60R (Cont.)
TAIL ROTOR GEARBOX
Monel safety wire is used to safety the connecting bolt between connecting
link and fitting inside pitch change shaft assembly. This link and fitting,
together with duplex ball bearing set, provide the connection between tail
rotor servo and pitch change shaft that allows shaft to rotate while
simultaneously moving axially with servo inputs. Monel is approximately 60-
65 percent nickel and 30 percent copper. Because this safety wire is not
normally subject to wear and is not exposed to significant amounts of oil,
contribution to NOAP is questionable.
Si
-
Silicon is not a critical wear metal in the tail rotor gearbox, but should be
monitored due to the potential for abrasion if levels grow too high. The
probable sources of silicon are contamination from sand or from leakage of
silicon base grease through the pitch change shaft sear. Oil change shall be
recommended for verified silicon level over 100 ppm.
A171

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