Discuss the advantages of solid-state limit switches over mechanical limit switches. Solid-state limit switches are used in many applications, particularly in the aircraft and aerospace industries. One such application is in landing gear control to detect the up, down, and locked conditions of the landing gear. High reliability is of utmost importance in such applications. The mean time between failure (MTBF) of over 100,000 h is possible with solid-state limit switches. Using your engineering judgment, give an MTBF value for a mechanical limit switch