Beechcraft Duke B60

This page's certificate is FAA TCDS A12CE, Revision 27 — confirmed against the FAA's own model list, which names exactly three models: "60 | A60 | B60." The page previously cited A-777, which is the pre-1957 straight-tail Bonanza V-tail — a single-engine airplane certificated over a decade before the Duke existed. The correction holds up: A12CE's Section I opens "Model 60, Duke ... Approved February 1, 1968; Model A60, Duke ... Approved January 30, 1970; Model B60, Duke ... Approved October 5, 1973," and every weight, airspeed limit and engine figure this page stores traces to that document or to a contemporary flight test of the specific model it describes.

This page's frontmatter describes the B60 (per variant: "B60"), the longest-produced and best-attested model, serials P-247 and on.

The Beechcraft Duke Model 60 (1968-1982) was Beechcraft's attempt to create a cabin-class pressurized piston twin slotted between the Baron and the King Air. Powered by two Lycoming TIO-541 turbocharged engines producing 380 bhp each (760 bhp combined — confirmed both by the certificate's own per-engine rating and by AOPA Pilot's independent flight-test sidebar, which states "2 380-hp Lycoming TIO-541-E1C4 ... 760 hp total"), the Duke offers pressurized FL250+ capability with a 240 KTAS high-cruise speed.

Only 596 Dukes were built across the 60, A60, and B60 variants before production ended in 1982. The Duke was always an expensive, low-volume aircraft that lived in the shadow of the King Air — which offered turbine reliability and higher altitude capability for not much more money.

Today the Duke has a devoted but small following of owners who love the airplane's performance and cabin comfort but accept the reality of very high maintenance costs. The Duke is commonly described as a "hangar queen" — an airplane that spends more time in the shop than in the air. Annual maintenance budgets of $40,000-$60,000+ are normal, and $100,000+ annual costs are not unheard of when major items come due.

The Duke is not for the budget-conscious. It's for pilots who specifically want a pressurized piston twin with Beechcraft build quality and are willing to pay whatever it costs to keep it flying.

The reference cruise is 240 KTAS at 26,000 ft, approximately 79% power (best economy mixture), burning 43.4 GPH combined — one row of the full cruise/range grid AOPA Pilot flew and published in its February 1983 test of a B60 (N850YR). No published row states exactly 75% power; 79% is the closest available and the article's own label, so it is recorded as-stated rather than rounded to a number nobody measured.

That grid was flown on the airplane's optional 232-gallon tip-tank configuration, not the standard 202-gallon tanks this page's frontmatter describes — the article states its conditions plainly: "232 gal fuel @ 6,125 lb mid-cruise weight." Speed and fuel flow at a stated power setting are properties of the airframe and engines, not of tank size, so the 240 KTAS/43.4 GPH figures are stored here regardless. Range is a different matter — it scales directly with fuel aboard — so range_nm is deliberately left blank on this page rather than repeating the tip-tank airplane's 1,068 nm figure under a standard-tank fuel capacity, which is exactly the "range claims more than the fuel allows" trap this catalogue exists to catch. The full published grid, for reference:

A standard 202-gallon Duke would see essentially the same speeds and fuel flows at each setting, but roughly 87% of the tabulated range (202/232), before accounting for the fact that reserve and climb fuel do not scale proportionally — which is exactly why this page declines to publish a precise standard-tank number rather than inventing one from that ratio. The full grid is saved as data/vault/performance/beechcraft-duke-60.cruise.json, labeled with its 232-gallon basis.

With a pressurized cabin maintaining roughly 10,000 ft cabin altitude at FL210-plus, the Duke offers a cabin experience closer to a turboprop than a piston.

Rate of climb at gross, sea level is 1,601 FPM — the same AOPA article, and an exact match to what this page had already stored (now properly sourced rather than carried forward as an unsourced generated figure).

Single-engine performance, per the same flight test: rate of climb 307 FPM at sea level, and a single-engine service ceiling of 15,100 ft — genuinely capable for a piston twin, and the reason this class is regularly cross-shopped against entry turboprops. Vyse (best single-engine rate of climb) is 112 KIAS, Vxse (best single-engine angle) 100 KIAS, and Vmc 85 KIAS. These single-engine figures are recorded here rather than under service_ceiling_ft/rate_of_climb_fpm, which describe the twin-engine airplane — the same convention this catalogue already uses on the Baron and King Air B200 pages, since there is no dedicated single-engine schema field.

Takeoff and landing distances are the AOPA article's own sea-level, standard-day, gross-weight figures (its own stated convention, not a non-standard worked example): takeoff ground roll 2,075 ft, takeoff over a 50-ft obstacle 2,626 ft, landing ground roll 1,318 ft, landing over a 50-ft obstacle 3,065 ft. All four replace prior unsourced figures that were considerably shorter — this is a real, sourced correction, not noise: a Duke needs a longer runway than this page previously implied, in both directions.

B60 Duke (2× TIO-541-E1C4, 760 bhp combined, 202 gal usable fuel):

The Duke's 2,350 lbs useful load (6,775 lb max gross minus a 4,425 lb standard empty weight — both from AOPA's independent flight-test sidebar) is generous for a piston twin, though six adults at 200 lb each plus full fuel comes in about 62 lb over gross on this page's own figures; six lighter adults or a modest fuel reduction closes the gap easily. Range is not shown in this table because this page does not store a range_nm figure for the standard 202-gallon airplane — the only published range data is for the optional 232-gallon tip-tank configuration (roughly 900-1,100 nm depending on power setting; see Performance Notes). The payload side of the equation is one of the Duke's real strengths; the issue isn't capability, it's cost.

• Flight Training (2): Not a training aircraft. Too expensive, too complex, and too specialized. The only training scenario is type-specific transition training.
• Backcountry (1): Heavy pressurized twin. Completely unsuitable.
• Business Travel (7): This is the Duke's mission — pressurized cabin-class travel. The score is limited by the extreme maintenance costs and reliability concerns that make scheduling business travel around the Duke risky.
• Aerobatics (1): Absolutely not.
• Cross-Country (8): Roughly 900-1,000 nm range at high cruise power in a pressurized cabin (the published grid tops out at 1,068 nm on the optional 232-gallon tanks; the standard 202-gallon airplane sees somewhat less). Excellent cross-country capability when the airplane is working. The reliability concern tempers the score.
• Cargo Hauling (4): Good cabin space but the weight and fuel burn make it impractical for cargo missions.
• Local Fun Flying (3): Burning 43+ GPH combined to fly around the pattern is absurd. The Duke exists for long-distance missions.
• Surveying (4): Pressurized cabin and high altitude capability are assets, but the cost makes it impractical for survey work.

Most Dukes have been upgraded given their high-performance mission profile:

• Typical ($30K-$60K): Garmin GTN 750Xi/650Xi, GFC 600 autopilot, engine monitoring. Essential for safe operation of turbocharged pressurized twin.
• Full upgrade ($80K-$130K+): Garmin G600 TXi PFD/MFD, dual GTN stack, comprehensive engine monitoring, weather radar. Many Duke owners invest heavily in avionics.
• Engine monitoring: Critical — turbo system monitoring with individual EGT/CHT for all cylinders is essential for turbo engine management.

• Turbo upgrades: Stainless steel turbo housings (mandatory replacement of original cast-iron units on pre-1974 models). This is not optional — cast-iron housings crack from heat cycling.
• Crankcase upgrades: Beefed-up crankcases (post-1978 serial numbers) address early cracking issues. Pre-1978 engines should have been upgraded.
• Engine upgrades: Limited aftermarket options. The TIO-541 is a complex, specialized engine with few STC alternatives.
• Speed mods: Gap seals and drag reduction available but marginal impact on a 215 KTAS airplane.

• Annual inspection: $6,000-$15,000 base. Pressurized twin with turbo engines requires extensive inspection.
• Engine overhaul: $55,000 per engine. Budget $110,000 per overhaul cycle.
• Parts availability: Fair. TIO-541 parts are available through Lycoming but some Duke-specific airframe parts are becoming scarce with only 596 built.
• Mechanic familiarity: Specialist required. Not many shops specialize in Dukes or TIO-541 engines. American Bonanza Society covers Duke models but the knowledge base is smaller than for Bonanza/Baron.
• Annual operating budget: $50,000-$80,000/year is realistic for 100-150 hours of flying. Some owners report $100,000+ years when engines or turbos come due.
• The Duke is not an airplane you operate on a budget. If you cannot comfortably absorb a $100,000 maintenance year, the Duke is not for you.

Pricing was NOT independently re-verified in this research pass — carried forward from the prior data pass unchanged, per this pass's instruction to leave existing values alone rather than replace them with an unsourced guess. The auto-synced Trade-A-Plane listings below (13 active listings, captured 2026-07-14) are the freshest actual market data on this page and broadly support the existing band, but were not used to recompute price_min_usd/price_max_usd/price_typical_usd this pass; they are not listed in this page's sourced: block. The 4.5x band across the frontmatter's own three price fields reflects 1968-1982 production spanning genuinely different eras of the same airframe (per the splitting rule's price caveat — age-driven spread, not conflated variants), not several different airplanes under one set of specs.

• 60/A60 Duke (1968-1973): $100,000-$200,000. Older models with cast-iron turbo and crankcase concerns. Cheapest Dukes but potentially most expensive to maintain.
• B60 Duke (1974-1977): $150,000-$300,000. Stainless turbos but pre-beefed crankcases.
• B60 Duke (1978-1982): $200,000-$450,000. Best models with both improvements.

Key value adjusters per Aircraft Valuation Methodology:

• Engine time: CRITICAL. With $55,000 per engine overhaul cost, engine time dominates valuation. Two mid-time engines can represent $60,000-$80,000 of remaining overhaul reserve.
• Turbo condition: Recently overhauled turbochargers add significant value.
• Pressurization condition: Tested and leak-free pressurization system adds value.
• Avionics: Modern glass panel adds $40,000-$80,000.
• Crankcase vintage: Post-1978 crankcases preferred.
• Warning: Low acquisition cost does not mean low ownership cost. A $150,000 Duke can easily cost $65,000+/year to operate.

Key ADs:

• Standard Lycoming TIO-541 ADs (turbo system, oil system, crankcase)
• Pressurization system inspections
• Landing gear inspections
• Wing spar inspections

Common Problems (EXTENSIVE):

• Turbocharger failures: The TIO-541's turbo system is maintenance-intensive. Cast-iron turbo housings on pre-1974 models cracked from heat — stainless steel replacements resolved this, but turbo system maintenance remains the #1 ongoing cost.
• Crankcase cracks: Pre-1978 engines had high incidence of crankcase cracks. Beefed-up crankcases (serial 781+) addressed this, but inspection of older engines is critical.
• Pressurization system: Seals, valves, and controllers require regular attention. Cabin leaks are common on older Dukes and expensive to track down.
• Engine overhaul cost: At $55,000 per engine ($110,000 total), the overhaul expense is staggering. With 1,600 hour TBO (AOPA's own "Recommended TBO 1,600 hr," matching this page's stored figure exactly), budget $69/hour for engine reserves alone. The $55,000 figure is a Tier B estimate — no specialty overhaul shop publishes a firm TIO-541 price (Western Skyways offers a TIO-541-E program but quotes only by phone), so it is positioned within the 6-cylinder turbocharged band in reference/engine-overhaul-pricing.md alongside the TSIO-360/TIO-540/TSIO-520-550 family rather than anchored on a specific quote. Treat it as a reasonable estimate, not a firm number.
• Prop overhaul: Two constant-speed, feathering props at $6,000-$8,000 each.
• Availability of mechanics: Few A&Ps specialize in the TIO-541 or Duke-specific systems. Finding a knowledgeable shop is essential and limits where you can base the airplane.

Per GA Insurance Underwriting:

• Hull insurance: $6,000-$12,000+/year. Pressurized twin-engine category is among the most expensive GA insurance categories.
• Liability: $1,000,000 smooth typically $1,500-$3,000/year.
• Pilot minimums: Multi-engine, instrument rated, 500+ total hours, 50+ multi hours, pressurized endorsement recommended. Many underwriters require Duke-specific or turbocharged twin-specific training.
• Limited market: Fewer underwriters will write Duke policies. Shopping for insurance may require a specialized aviation insurance broker.