TM 1-1520-238-T-43–173–7.SYSTEM DESCRIPTION (cont)3–7(2) TLGAssembly.The TLG assembly (fig. 3–14) supports the helicopter during all modes of groundoperations. The TLG extends and compresses which reduces pitching velocities and the possibility ofblade–to–boom contact during tail–low landing impacts.The tail wheel proximity switch provides the pilot thecapability 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 absorbingloads 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 socketfor operation of the tail wheel centering mechanism and allows the tail wheel to swivel 360. At takeoff, the wheelcentering 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 loadsresulting from normal and high–impact landings. The TLG shock strut assembly functions basically the same asthe MLG shock strut. An internal floating diaphragm separates the hydraulic fluid from the nitrogen gas and moveson–top of the fluid as the shock strut’s upper piston extends and retracts. The hydraulic fluid flows between theupper piston and cylinder through a poppet valve and orifices which restrict flow. This, in conjunction with thenitrogen gas compression, dampens helicopter landing shock.(d) Wheel and Tire Assembly.The wheel and tire assembly provides the helicopter with thecapability of ground movement during taxi, towing and run–on landing operations.M58-097ATRAILING ARMASSEMBLYLOCK HANDLESHOCK STRUTASSEMBLYHOUSINGAND SOCKETTRAILING ARM ASSEMBLYFORKASSEMBLYAXLE ASSEMBLYWHEEL CENTERINGMECHANISMASSEMBLYWHEEL AND TIREASSEMBLYWHEEL LOCKACTUATORSYSTEMTAIL BOOMSTRUCTUREFigure 3–14.TLG Assembly
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