Patent ID: 7259685
Filing Date: 2007-08-21
Classification: B60Q,B64D,H05B

Abstract:
1. In a helicopter of the type having an electrical system, a landing light, a master switch, a landing light switch, and a power supply of between about 18 to 32 volts DC for operating said electrical system and illuminating said landing light when said master switch is in an on position, the improvement comprising: a landing light fault annunciator including a light switch for turning said landing light on and off and circuit means for detecting a fault in said landing light and providing a signal indicative of a fault when said master helicopter battery switch is connected to said power supply, and wherein said means for detecting a fault in said landing light and for providing a signal indicative of a fault in said landing light is operative whether or not said landing light switch is in an on or off position and said circuit means includes a pair of driver chips in parallel to provide sufficient capacity for the load and the driver chips each cause the voltage to shift to a lower state when there is a fault in said landing light.