Twin-engine brings redundancy + heavy payload
The Cheyenne's main advantage over modern single-engine turboprops (TBM, PC-12) is the redundancy of two PT6A-28 engines: if one engine fails, the airplane keeps flying safely. It also offers a useful load of 3,000 lb (vs 2,700 lb for the TBM 940), allowing 7-8 adult occupants with full baggage on 1,000+ nm missions.