SYSTEM DESCRIPTION (cont)
(e) Normal/HighImpact Landing.
During normal operation, the fuse collar holds the lower piston in
an extended position. The lower cylinder is filled with hydraulic fluid which provides a solid column of fluid against
the lower piston chamber. In the event of a high impact landing, the force shears the retaining flanges on the
piston and rupture a burstdisc. The lower piston then moves into the cylinder and hydraulic fluid flows into the
upper piston chamber at a restricted rate through an orifice. This action aids the upper piston in absorbing
excessive shock loads by providing a controlled rate of collapse.
(f) Wheel and Tire Assembly.
The wheel and tire assembly rotates on the trailing arm axle bearings.
The wheel and tire assembly provides the helicopter with ground movement capability for taxiing, runon
landings, towing, aids in cushioning landing shocks, and provides parking support.
VENT PORT (2)
NITROGEN FILL PORT
(LOWER CYLINDER CHAMBER)
KNEELING COUPLING PORT
HYDRAULIC FILL PORT
SHOCK STRUT ASSEMBLY
RETAINING PIN (3)