The original poster was asking what the squat switches do on a BE76. On my BE36 they prevent retracting the gear with weight on the wheels, in addition there is a 'Magic Hand' system with a sensor in the pitot system to lower the gear automatically when below a certain airspeed and below a certain manifold pressure. Two other Beech types I have flown had the same arrangement (but not the Magic Hand). I know the BE76 is not part of the Bonanza/Baron family and may well have another gear system but I think Beech always uses a squat switch for the same reason. On my aircraft the three greens are activated by microswitches sensing the position of the gear retract rods, not the squat switches. The squat switches are on the main landing gear legs, the microswitches for the greens indication are inside the cabin below the pilots seats, next to the landing gearbox.