A microswitch in the throttle quadrant activates a warning horn and red WARNING GEAR UNSAFE light under the following conditions: 

• Gear up and power reduced below approximately 14 inches of manifold pressure, or automatic extension triggered and gear handle in UP position.
• Gear selector switch UP while on the ground and throttle in retarded position.
• Whenever the flaps are extended beyond the approach position (10°) and the landing gear is not down and locked.