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
