(f) Wheel and Tire Assembly.

TM 1-1520-238-T-4 3–16 3–7. SYSTEM DESCRIPTION (cont) 3–7 (e) Normal/High–Impact 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 burst–disc. 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, run–on landings, towing, aids in cushioning landing shocks, and provides parking support. M58-094A TRAILING ARM ASSEMBLY PIVOT CONNECTION STRUT ARM VENT PORT (2) PIVOT MOUNT HELICOPTER FRAME UPPER PISTON NITROGEN FILL PORT (LOWER CYLINDER CHAMBER) KNEELING COUPLING PORT CHAMBER) HYDRAULIC FILL PORT (UPPER CYLINDER SHEAR COLLAR CYLINDER (NORMAL POSITION) LOWER PISTON FAIRING SHOCK STRUT ASSEMBLY MLG WHEEL AND TIRE ASSEMBLY CROSS TUBE ASSEMBLY HYDRAULIC BLEED PORT RETAINING PIN (3) FUSE COLLAR SQUAT SWITCH TARGET Figure 3–13. MLG Assembly