Beechcraft Duchess BE-76

Beech announced the Duchess in 1977 and began production in 1978. The airplane was Beech's answer to the Piper Seminole and the Cessna 310's training-twin variants, aimed at the flight-school market that wanted a cheaper, simpler twin than the Baron. The Duchess shared its Bonanza-family DNA in handling characteristics but with smaller engines (Lycoming O-360-A1G6D at 180 hp counter-rotating) and a simpler systems layout.

Production ran for five years and totaled 437 aircraft. The early-1980s general aviation market collapse hit the Duchess hard. Flight schools that had ordered the airplane in 1979 and 1980 deferred deliveries. Private-owner sales were slow. Beech ended production in 1982 and never restarted the line, despite occasional rumors over the decades that the airplane might return. The Bonanza, Baron, and King Air continued in production. The Duchess did not.

The fleet that survived has stayed in service primarily as a training airplane. Many Duchesses have spent their entire lives as multi-engine trainers at various flight schools. Some have moved to private ownership in retirement. The American Bonanza Society covers the Duchess alongside the Bonanza and Baron families, which gives the type more technical support than the production numbers would suggest.

The Duchess cruises at about 158 KTAS at 75% power and 6,000 to 8,000 feet, burning roughly 22 gph total (11 per side). Long-range cruise at 65% drops to about 148 KTAS on 18 gph total. The Duchess is slightly slower than a Seminole at similar power settings due to the higher drag of the airframe (T-tail and bubble canopy). It's a training-airplane speed, not a cross-country speed.

Single-engine performance is essentially identical to the Seminole because both use the same 180 hp counter-rotating Lycoming O-360 engines. Sea level standard single-engine climb is about 220 fpm at gross weight. The counter-rotating engines mean no critical engine, which simplifies engine-out training. Useful load is about 1,000 pounds. Full fuel (100 gallons usable) leaves about 380 pounds for people and bags. The Duchess seats four. Four-up cross-country with bags doesn't work.

The Lycoming O-360-A1G6D (left) and LO-360-A1G6D (right) are the Duchess engines. The same basic engine family as the Piper Seminole but with the -A1G6D variant rather than the Seminole's -A1H6. Both engines have a 2,000-hour TBO per Lycoming Service Instruction 1009 BE. They are carbureted, run on 100LL, and have the same reverse-rotation right-engine variation that eliminates the critical-engine problem.

Field overhauls at Gann Aviation, Penn Yan, or other reputable shops run $31,000 to $40,000 per engine in 2026 prices. The same price band as a Seminole. The O-360 family is the most widely-installed Lycoming engine in general aviation, with parts and shop knowledge essentially universal.

Oil consumption on healthy O-360-A1G6D engines runs about 0.2 to 0.4 quarts per hour per engine. The engines typically reach TBO without intermediate top overhauls. Most issues in the used Duchess fleet are airframe-related rather than engine-related. The engines are the easy part of owning this airplane.

Plan on $280 to $390 per flight hour at 150 hours a year of utilization, all-in. The Duchess and the Seminole are essentially tied for cheapest piston-twin operating cost. Fuel and oil run about $120 to $155 per hour at 22 gph and $5.50 to $7 fuel. Engine overhaul reserve is $32 to $40 per hour for two engines. Prop reserve is $3 to $5 per hour. Airframe maintenance reserve is $35 to $60 per hour, slightly higher than the Seminole due to the gear-AD compliance and parts-availability friction.

Annual fixed costs (hangar, insurance, annual inspection) add another $65 to $110 per hour at 150 hours a year. Insurance is meaningfully easier than on conventional-rotation twins because the counter-rotating engines simplify the underwriter's loss models. First-time twin owners can pay $7,000 to $14,000 for first-year coverage. Established Duchess pilots with 200-plus hours in type pay $4,500 to $7,500.

Acquisition cost in mid-2026 typically runs $80,000 to $160,000. Lower-end aircraft have higher hours, older panels, or training-fleet pedigrees with the corresponding maintenance histories. Higher-end aircraft have fresher engines, modern Garmin panels, and lower hours. Late-production 1981-1982 Duchesses trade at the high end of the range. The Duchess is the cheapest path into a cabin-class trainer twin.

Beechcraft service support for the Duchess is limited compared to the Bonanza and Baron families. American Bonanza Society covers the Duchess in its technical support and forum, which gives type-specific knowledge a home, but parts depth is thinner. The mandatory landing-gear AD inspection (every 100 hours, no terminating action) is the Duchess's defining ownership-cost wrinkle.