Beech King Air 90

Overview

The King Air 90 family is the founding lineage of Beechcraft’s pressurised twin-turboprop dynasty, in production from 1964 through 2024 across nine major variants. The figures and notes on this page reflect the E90, manufactured 1972 to 1981 and widely regarded as the family’s sweet spot. The E90 marries the compact C90 fuselage with the more powerful 550-shp PT6A-28 engines and the 474-gallon fuel system inherited from the King Air 100, producing a turboprop with substantially better climb and range than earlier 90-series variants without the cost or complexity of the larger 200-series.

For the GA buyer, the E90 sits at the entry point of pressurised cabin-class turboprop ownership: docile handling, a well-supported airframe, parts and training abundance, and the depth of operator knowledge that comes with one of the longest-running production runs in business aviation.

Key Features for GA Buyers

• Range and endurance. With 474 gallons of usable fuel and roughly 71 GPH cruise burn, the E90 ranges 1,468 nautical miles, making it a credible cross-country machine in a family otherwise known for short-leg corporate work.
• Robust engines. PT6A-28 turbines flat-rated to 550 shp deliver consistent hot-and-high performance and the durability the PT6 family is known for, with a 3,600-hour TBO.
• Forgiving transition. Among legacy turboprops, the King Air 90 has the reputation as the easiest step up from a piston twin, with handling that rewards rather than punishes.
• Cabin comfort. The square-oval pressurised cabin seats up to seven, with the iconic aft airstair door for unaided passenger boarding.

Trade-offs

• Maintenance discipline required. Phase 1-4 inspections and the 72-month landing-gear inspection cycle are non-negotiable, and operators who defer them face escalating costs at the next pre-buy.
• Slow by modern standards. 245-knot cruise is fine for the mission profile but well off the 280 to 300 knots of newer single-engine turboprops like the TBM 940 or PC-12.
• Avionics ageing. Many E90 airframes still carry analogue panels; budget for a Garmin G500 TXi or G1000 NXi retrofit if a modern flight deck matters.
• Operating cost step-up. Two PT6 turbines and pressurisation push costs well above piston twins: budget roughly 790 USD per hour in variable direct costs (fuel, maintenance, engine reserve), with all-in hourly costs closer to 1,300 to 1,450 USD once insurance, hangar, inspections, and depreciation are amortised at low utilisation.

See Also

• Beech King Air 100 – direct up-step within the family, larger fuselage and stronger engines. Compare
• Piper Cheyenne I – closest direct competitor in the entry-level cabin-class turboprop bracket. Compare
• Cessna Conquest I – the Cessna cabin-class twin turboprop in the same operational segment. Compare
• Mitsubishi Marquise / Solitaire – the speed-focused MU-2 alternative to the King Air formula. Compare
• Rockwell Commander 690 – another 1970s pressurised cabin-class twin in similar mission scope. Compare