TM 1-1500-204-23-2
Figure 4-171. Complex Shock Strut (Metering Pin)
the use of a shock strut annular space. The annular
space is a chamber that surrounds the polished piston
surface that lies within the cylinder. The annular space
has no definite volume. The volume depends on the
amount the shock strut is extended or compressed. The
annular space is at minimum size when the shock strut
is completely extended and at maximum size when the
strut is completely compressed. As the shock strut
extends, fluid passes from the piston into the annular
space.
Figure 4-172. Complex Shock Strut (Plunger)
2 Strut retraction. Compression of the
shock strut forces fluid from the annular space back
into the piston. Transfer of fluid into or out of the annular
space takes place through transfer passages in the wall
of the piston. The fluid moves with some resistance, the
resistance varying with the size of the transfer pas-
sages. In simple shock struts, the transfer passages are
merely holes. In many complex shock struts, the pas-
sages are provided with a snubber valve or a rebound
control valve. Such a valve allows fluid to flow more
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