LANDING GEAR

TM 55-1520-240-23-3 3-1 LANDING GEAR 3-1 There are four high-flotation landing gear assemblies, two forward and two aft. The two forward assemblies have dual wheels. Each aft assembly has a full-swivel single wheel. The aft wheels can be locked in trailing position. A power steering unit is installed on the aft right landing gear assembly. FORWARD LANDING GEAR The forward landing gear dual wheels are installed on a fixed axle. The axle is mounted on an air-oil shock strut bolted to the fuselage support structure. A torque arm keeps the assembly aligned. A disk and brake unit are provided for each wheel. Hinged panels allow access to the forward landing gear assemblies. Each assembly has a towing and tiedown fitting. The wheels can be raised at jacking points on the lower torque arms. Left and right landing gear assemblies can be converted for use in either forward position. AFT LANDING GEAR Aft landing gear assembly is installed on each side of the fuselage. Each aft wheel is mounted on an axle supported by a spindle. The spindle rides on bearings in the swivel housing. Upper and lower drag links support the swivel housing. Both drag links are connected to fuselage fittings. A shock strut is mounted between the lower drag link and a fuselage fitting. The shock strut has a static lock mechanism to prevent strut extension during helicopter jacking. A disk and brake unit are installed on each wheel. The aft wheels can be free to swivel, or they can be locked in trailing position. A centering cam in the swivel housing centers each wheel in trailing position. A hydraulically-operated swivel lock secures the wheel in this position. The power steering actuator is connected to the aft right landing gear swivel housing. A towing and tiedown fitting is also attached to this housing. Static ground wires are installed on each landing gear axle housing. A proximity switch is mounted on the forward bulkhead of each aft landing gear compartment. Linkage from the upper drag link is connected to a target which is sensed by each switch. The switches are operated as the helicopter takes off or lands. Extensions on the aft axles are used for connecting a tow bar. An aft landing gear assembly can be installed on either side of the helicopter. This requires disassembly and repositioning of certain components. 3-2