LANDING GEAR (Continued)

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