56TC were as planned, it proved a good testbed and experience building model for the Duke's development. However, it was a noticeably loud airplane, especially so for a Beechcraft. Along with its increased noise, the 56TC had an increase in structural strength and thus empty weight to compensate for the higher power. When introduced in 1967, it was the fastest Beech aircraft, rivaling even the early King Airs sold at the time. 93 Baron 56TC aircraft were built between 1967 and 1971 and all use the ICAO type designator BE56. 56TC Introduced in 1967, built until the 1969 model year. Four to six seats. Power came from two 380-hp (283-kW) Lycoming TIO-540-E1B4 turbocharged piston engines. Priced at $89,950 in 1967. 82 aircraft sold. A56TC Introduced 1970, built until 1971. Only model change throughout the 56 production. Featured new exterior paint scheme and interior design, new instrument panel, smooth rotating beacon and navigation lights, nose wheel light. Priced at $101,750 in 1970. 11 manufactured. Baron 58 Introduced for the model year 1969, the larger, more powerful Baron 58 was developed from the Baron 55, with an increased gross weight of 5,400 lbs. Depending on the variant, the Baron 58 is fitted with either Continental IO-520 or IO-550 300-hp engine. The Baron 58 can cruise at 200 knots (370 km/h) at 7000 ft (2100 m). The most significant change was a fuselage stretch of and the introduction of double rear fuselage doors and reversible club seats in the center row, eliminating the need for passengers to climb over the center seats or through the rear baggage door to access the rear seats. The entire fuselage was repositioned forward on the wing to address the aft CG issue that plagued the short-body models. The longer 58 fuselage has four side windows while the 55 and 56 fuselages have three. The larger fuselage and improved rear-cabin access have made the 58 far more popular with commercial air charter and cargo operators than the smaller 55 and 56. ICAO type designator of all versions is BE58. In 1976, the turbocharged Baron 58TC and pressurized Baron 58P were introduced. These variants were powered by turbocharged Continental TIO-520s of 310–325 hp (230–240 kW), had an increased 6100–6200 lb (about 2800 kg) gross weight, and were certified under FAR23 with a new type certificate. The Baron 58P/58TC models were capable of cruising at 200 knots (370 km/h) at