Terminal #3 Squat switch Gear selector switch Throttle switch Gear unsafe light (red) Terminal #2 Terminal #1 Control current Down motor, high current UP DOWN Hydraulic pump motor assembly Advanced Retarded Gear horn FLT POS GND POS Landing gear motor (25 Amp) Landing gear control (5 Amp) 30A C.B.1 5A C.B.2 Not UP UP Not DN DN Not UP UP Not DN DN Not UP UP Not DN DN UP limit DN limit UP limit DN limit UP limit DN limit Right green  down light Nose green down light  Left green down light LEFT GEAR NOSE GEAR RIGHT GEAR DOWN UP Current flow Figure 9-97.  Aircraft landing gear schematic while gear is moving to the UP position. Some aircraft use an inverter power switch to control AC  power. Many aircraft simply power the inverter whenever the  DC bus is powered and no inverter power switch is needed.  On complex aircraft, more than one inverter may be used to  provide a backup AC power source. Many inverters also offer  more than one voltage output. Two common voltages found  on aircraft inverters are 26VAC and 115VAC. 9-56