The STC allows owners of a 415-C, 415-CD, 415-D, 415-E, 415-G, F-1, F-1A, A-2 and A2-A aircraft to replace their aging, out of production TCM C75 and C85 engines with the TCM O200A 100-hp series powerplant without the loss of Light-Sport Aircraft (LSA) eligibility, according to company officials.