(d) Wheel and Tire Assembly

TM 1-1520-238-T-4 3–17 3–7. SYSTEM DESCRIPTION (cont) 3–7 (2) TLG Assembly. The TLG assembly (fig. 3–14) supports the helicopter during all modes of ground operations. The TLG extends and compresses which reduces pitching velocities and the possibility of blade–to–boom contact during tail–low landing impacts. The tail wheel proximity switch provides the pilot the capability of verifying that the tail fork and wheel assembly are in a locked position. (a) Trailing Arm Assembly. The trailing arm assembly provides support to the TLG by absorbing loads during landing and taxiing and transfers the loads to the shock strut and tail boom structure. (b) Wheel Centering Mechanism. The TLG fork and axle assembly provides a housing and socket for operation of the tail wheel centering mechanism and allows the tail wheel to swivel 360�. At takeoff, the wheel centering mechanism causes the fork assembly to center as helicopter weight is removed from the wheel. (c) Shock Strut Assembly. The shock strut assembly absorbs and cushions vertical impact loads resulting from normal and high–impact landings. The TLG shock strut assembly functions basically the same as the MLG shock strut. An internal floating diaphragm separates the hydraulic fluid from the nitrogen gas and moves on–top of the fluid as the shock strut’s upper piston extends and retracts. The hydraulic fluid flows between the upper piston and cylinder through a poppet valve and orifices which restrict flow. This, in conjunction with the nitrogen gas compression, dampens helicopter landing shock. (d) Wheel and Tire Assembly. The wheel and tire assembly provides the helicopter with the capability of ground movement during taxi, towing and run–on landing operations. M58-097A TRAILING ARM ASSEMBLY LOCK HANDLE SHOCK STRUT ASSEMBLY HOUSING AND SOCKET TRAILING ARM ASSEMBLY FORK ASSEMBLY AXLE ASSEMBLY WHEEL CENTERING MECHANISM ASSEMBLY WHEEL AND TIRE ASSEMBLY WHEEL LOCK ACTUATOR SYSTEM TAIL BOOM STRUCTURE Figure 3–14. TLG Assembly