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Beechcraft King Air 260 vs Piper M600 Sls vs Piper Seneca

The Beechcraft King Air 260 is a twin‑engine turboprop positioned as a higher‑end business and utility aircraft. It typically offers the longest practical range of the three (roughly around 1,500–1,700 nautical miles depending on configuration and reserves) and carries about 6 to 9 occupants in common executive layouts, with strong climb and high‑altitude capability. The Piper M600 SLS is a single‑engine turboprop aimed at owner‑pilots seeking near‑turboprop performance with simpler operation. Its range is generally in the same broad band as the King Air but often a bit less in real-world mission planning (about 1,200–1,500 nautical miles), and seating is usually up to 6. The Piper Seneca is a light twin‑piston aircraft oriented toward personal, training, and light business use. It usually has the shortest range of the group (often about 700–1,000 nautical miles) and typically seats 5 to 6, trading speed and altitude performance for lower acquisition and operating costs.

SpecBeechcraft King Air 260Piper M600 SLSPiper Seneca
Summary
Cockpit222
DOC / nm$ 4.30$ 2.19$ 1.69
Min Crew11
Total Seats866
Flight RulesIFRIFRIFR
ManufacturerBeechcraftPiperPiper
Aircraft NameKingAir 250M600Seneca
CertificationFAA / EASAFAA / EASAFAA / EASA
Max Range (nm)14201406828
DOC / nm / Seat$ 0.72$ 0.55$ 0.28
Max Cabin Seats8
OEM VerificationVERIFIEDVERIFIEDUn-Verified
Useful Load (lbs)376022001331
Standard Cabin Seats644
Direct Operating Cost$ 1,333$ 603$ 337
Flight Deck (Base Spec)Rockwell Collins Pro Line FusionGarmin G3000Garmin G1000 NXi
Max Cruise Speed (ktas)310274200
Base Aircraft Price (USD)$6,450,000$3,081,400 $1,095,000
Cabin
Cockpit222
Lavatory1 FlushingNo
Min Crew11
Total Seats856
Max Cabin Seats8
Lavatory LocationAFT
Cabin Pressure (psi)6.55.6
Galley / RefreshmentNoRefreshment Centre
Standard Cabin Seats644
SL Cabin Altitude (ft)1529312600
Galley LocationMID
Max Cabin Altitude (ft)8644
Engine
FADECYesNoNo
ModelPT6A-52PT6A-42ATSIO-360-RB
TBO (hrs)360036001800
Horsepower850600220
Flat RatingISA + 37ISA + 55
No. of Engines112
Fuel Capacity (gal)544260122
Fuel TypeAvGas
Fuel DeliveryFuel Injected
Dimensions
Length (ft)43.829.728.6
Wingspan (ft)57.943.239
Cabin Width (ft)4.54.1
Cabin Height (ft)4.84
Cabin Length (ft)16.712.3
Overall Height (ft)14.811.310
Cabin Width - Floor (ft)4.1
Cabin Length - Seating (ft)16.7
Baggage Volume Int. (cu. ft)5520
Cabin Volume (cu. ft)165