TM 55-1520-240-23-3
3-1
LANDING GEAR
(Continued)
3-1
PROXIMITY SWITCHES
Linkage from the aft landing gear upper drag link is
connected to a target. The target is set so the proximity
switch is open when the helicopter is in flight. When the
helicopter is on the ground, the switch is closed. The
switches prevent DASH actuator input during lift-off to
hover. They also reduce AFCS sensitivity 50 percent
until lift-off. The right switch turns off the IFF when the
helicopter is on the ground.
STATIC LOCK MECHANISM
The static lock mechanism is a link attached to aft
landing gear shock strut. It is operated by hand to lock
the shock strut in the up position when the helicopter
is jacked.
SWIVEL HOUSING AND SPINDLE
A swivel housing is supported by the two drag links and
shock strut of each aft landing gear. The housing allows
the spindle and wheel to swivel 360º. A centering cam
in the housing centers the wheel in the trailing position
for taxiing or flight. The swivel locking pin can lock the
wheel in this position.
3-5
