• the MLG and NLG retracted microswitches. These microswitches are
operated when the landing gears are fully stowed in the aircraft bays
(following UP selection)
• the MLG and NLG RA extended and locked microswitches. These
microswitches are operated when the internal mechanical lock is
engaged (following DOWN selection)
• the MLG SA actuator extended microswitches. These microswitches
are operated by the shock absorber when the SA actuator is fully
extended (following UP selection)
• the MLG SA actuator retracted microswitches. These microswitches
are operated when the SA actuator is fully retracted (following DOWN
selection)
• the MLG SA actuator locked microswitches. These microswitches are
located inside the actuator and are operated by an internal device
when the SA actuator is fully retracted (following DOWN selection)
LANDING GEAR – PRINCIPLE OF OPERATION
ON GROUND
When the helicopter is on the ground the Landing Gear Control Lever
(LGCL) is locked DOWN by a pin controlled by the Weight-On-Wheel
(WOW) microswitches.