reset circuit breakers automatically reset themselves. They  should not be used as circuit protection devices in aircraft.  When a circuit breaker trips, the electrical circuit should be  checked and the fault removed before the circuit breaker  is reset. Sometimes circuit breakers trip for no apparent  reason, and the circuit breaker can be reset one time. If the  circuit breaker trips again, there exists a circuit fault and the  technician must troubleshoot the circuit before resetting the  circuit breaker.  [Figure 9-173] Some new aircraft designs use a digital circuit protection  architecture. This system monitors the amperage through  a particular circuit. When the maximum amperage for that  circuit is reached, the power is rerouted away from the circuit.  This system reduces the use of mechanical circuit breakers.  The advantages are weight savings and the reduction of  mechanical parts. On some types of installations, a switch in the cockpit  provides for steady or flashing operation of the position  lights. On many aircraft, each light unit contains a single lamp  mounted on the surface of the aircraft. Other types of position  light units contain two lamps and are often streamlined into  the surface of the aircraft structure. The green light unit is  always mounted at the extreme tip of the right wing. The red  unit is mounted in a similar position on the left wing. The  Aircraft operating at night must be equipped with position  lights that meet the minimum requirements specified by Title  14 of the Code of Federal Regulations. A set of position  lights consist of one red, one green, and one white light.  [Figures 9-174  and  9-175] Aircraft lighting systems provide illumination for both exterior  and interior use. Lights on the exterior provide illumination  for such operations as landing at night, inspection of icing  conditions, and safety from midair collision. Interior lighting  provides illumination for instruments, cockpits, cabins, and  other sections occupied by crewmembers and passengers.  Certain special lights, such as indicator and warning lights,  indicate the operation status of equipment. Position, anticollision, landing, and taxi lights are common  examples of aircraft exterior lights. Some lights are required  for night operations. Other types of exterior lights, such as  wing inspection lights, are of great benefit for specialized  flying operations. Aircraft Lighting Systems Exterior Lights Position Lights Figure 9-175.  A right wing tip position light, also known as a  navigation light.  Figure 9-173.  Circuit breaker panel. Figure 9-174.  A left wing tip position light (red) and a white strobe  light. 9-101