SUMMARY The concept of "time-sharing" of control and interlock wiring is introduced in this paper. This concept calls for the use of one wire to transmit many functions each in its own distinct time period, thereby reducing the number of wires necessary. The type of functions that are adaptable and some aircraft systems that utilize the functions are listed. A comparison of rotating vs. solid state commutators is made, and considerable effort is directed into understanding solid state switching theory. The use and operation in switching circuits of three types of solid state components, (silicon controlled rectifiers, unijunction transistors, and transistors) is presented. The theory of operation of the circuits required to build the "time-sharing" units is discussed. Some circuits included in this discussion are an astable multivibrator, a ring counter, and a channel synchronizing circuit. Successful operation of the "time-sharing" concept was demonstrated by connecting control relays and interlock circuits through the solid state commutators. Some limitations are mentioned as well as possible future uses of "time-sharing". Twenty-six oscillograph traces and the necessary circuit diagrams are found in the appendix.