Beechcraft Super King Air 350 Aircraft Parts, Equipment, and Tooling List

The Beechcraft Super King Air 350 is a twin-engine, pressurized turboprop that has become a global workhorse for corporate operators, government agencies, air ambulance providers, and special-mission operators. Powered by two Pratt & Whitney Canada PT6A-60A engines, each producing about 1,050 shaft horsepower, the King Air 350 delivers jet-like cruise performance while retaining excellent short- and unimproved-field capability and a comfortable, stand-up capable cabin for up to 9 to 11 occupants.

Key Specifications

Manufacturer: Beech Aircraft Corporation / Beechcraft (now a Textron Aviation brand)

Production Years: 1990 to Present (B300 King Air 350 and its modern 350i/350ER derivatives)

Engine: Two Pratt & Whitney Canada PT6A-60A turboprops, approx. 1,050 shp each

Seating Capacity: Typically 8 to 10 passengers – maximum 11, plus 1 to 2 pilots

Maximum Takeoff Weight: 15,000 lbs (6,804 kg) for standard 350/350i models; 16,500 lbs (7,484 kg) for 350ER

Wingspan: About 57’ 11” (17.65 m) with factory winglets

Service Ceiling: 35,000 ft (10,668 m)

Cruise Speed: Approximately 312 knots (about 359 to 368 mph or 574 to 578 km/h) at typical cruise altitudes

Typical Range: About 1,500 to 1,800 nautical miles for the 350/350i models, up to about 2,600 to 2,700 nm for the 350ER extended range variant, depending on configuration

Cabin Dimensions: Roughly 19’ 6” long, 4’ 6” wide, 4’ 9” high, with double-club executive seating and aft baggage area

Overview & History

The King Air family was launched in the 1960s and quickly became one of the most successful cabin-class turboprop lines in history. Building on the highly regarded King Air 200 series, Beechcraft developed the Model 300 and then the larger B300, marketed as the “Super King Air 350,” to offer more cabin volume, higher payload, and better performance for business and special-mission operators.

Introduced in 1990, the King Air 350 extended the King Air 300 fuselage to accommodate two additional cabin windows per side, incorporated factory winglets, and increased maximum takeoff weight, all while retaining the rugged landing gear and the proven PT6A-60A engines. The “Super” branding was dropped in 1996, and the aircraft became known simply as the King Air 350. It later evolved into today’s 350i and 350ER models, featuring modern avionics, enhanced pressurization, and updated interiors.

Over more than three decades in service, the King Air 350 has proven itself in demanding roles including corporate shuttle, air ambulance, maritime patrol, flight inspection, and intelligence, surveillance, and reconnaissance (ISR). Its combination of payload, range, multi-mission adaptability, and lower operating cost compared to light jets makes it especially attractive to flight departments and government agencies around the world.

Variants & Sub-Variants

King Air 300/350 Family (1983 to Present)

The King Air 300 and 350 series represent the pinnacle of the King Air turboprop line, designed for operators who require maximum cabin volume and performance within the twin-turboprop category.

Model 300 “Super King Air 300” (Mid-1980s)

The Model 300 was developed from the King Air 200, featuring more powerful PT6A-60A engines, aerodynamic refinements, and an increased maximum takeoff weight. It laid the engineering foundation for the later B300/350 stretch, including the “pitot” engine nacelles and commuter-category certification.

Model B300 King Air 350 (1990 to Present)

The B300, marketed as the King Air 350, stretched the King Air 300 fuselage and added winglets, two additional cabin windows per side, and a higher maximum takeoff weight. The aircraft seats up to 11 occupants in a double-club layout and offers a range of approximately 1,500 to 1,800 nautical miles with NBAA IFR reserves, depending on configuration. It remains in production today as the basis for the 350i and 350ER family.

Model B300C King Air 350C

The B300C is a utility and special-mission derivative of the King Air 350, featuring a large cargo door and reinforced structure for cargo, air ambulance, surveillance, or maritime patrol roles. Several have been delivered to government and military operators with custom mission equipment, including underwing hardpoints, modified fuselage panels, and observation windows.

King Air 350i (2009 to Present)

Announced in 2008 and certified in 2009, the King Air 350i introduced an upgraded passenger cabin with improved soundproofing, integrated entertainment and cabin management controls, LED lighting, and modernized interior styling. The 350i retained the PT6A-60A engines but featured enhanced noise and vibration reduction, making cabin comfort competitive with many light jets while maintaining the short-field and cost advantages of a turboprop.

King Air 350ER (Extended Range, 2007 to Present)

The King Air 350ER is an extended-range, higher-gross-weight derivative designed for special missions and long-endurance surveillance work. It incorporates strengthened Beechcraft 1900 landing gear, higher maximum takeoff weight (up to about 16,500 lbs), extra fuel capacity in enlarged nacelle tanks, and provisions for mission pods or belly radar. With these upgrades, the 350ER can stay on station for many hours and reach ranges in excess of 2,400 nautical miles in certain profiles.

King Air 350iER / 350iC / 350iCER

Later designations, such as the 350iER and 350iCER, combine the extended range and utility door options with the refined 350i interior and updated avionics suites. These aircraft are tailored for maritime patrol, border surveillance, flight inspection, and airborne law enforcement missions, where long endurance and flexible cabin layouts are critical.

Military and Government Derivatives

Many air arms and government agencies operate King Air 350-series aircraft for reconnaissance, transport, and training purposes, sometimes under military designations or as specialized mission variants. These platforms frequently feature belly sensor turrets, mission consoles, SATCOM systems, and modified electrical systems to support high mission loads – all of which influence parts and tooling requirements for aviation maintenance professionals.

Engine Evolution of the King Air 350

The King Air 350 and its derivatives are powered by the Pratt & Whitney Canada PT6A-60A turboprop, a time-tested, free-turbine engine series used across various turboprop types.

Highlights and Implications for Parts/Equipment Selection

Higher gross weights and extended-range configurations such as the 350ER place additional emphasis on robust landing gear service, brake and tire capacity, and nacelle fuel system maintenance. Aviation maintenance professionals should ensure that jacks, jack pads, axle jacks, and tire tooling are rated appropriately for the 15,000 to 16,500-lb MTOW range.

The PT6A-60A’s hot-section inspections, compressor washes, and fuel-control calibration require PT6-specific tooling and test equipment, including torque adapters, fuel nozzle testers, and dedicated borescope kits.

Operators upgrading to Blackhawk or other engine/propeller STCs must verify the compatibility of propeller sling equipment, prop stands, and engine handling fixtures, as five-blade composite props and higher-rated engines may have different hub dimensions and weight distributions.

Modern King Air 350 and 350i aircraft typically feature Collins Pro Line 21 or later avionics suites, which influence required avionics test equipment, pitot-static test sets, and RVSM-compliant tooling for altitude system checks.

Maintenance and Ownership Tips

Regularly inspect winglets, flap tracks, and control surface linkages, especially on aircraft frequently operated from short or unimproved strips.

Pay close attention to all ice-protection systems – including pneumatic boots, propeller anti-ice, and windshield heat – as King Air 350 operations often involve all-weather IFR flying.

Monitor pressurization system performance and cabin leak checks, particularly on higher-cycle corporate and commuter aircraft.

Maintain landing gear components, including gear actuators, side braces, and wheel assemblies, in accordance with Beechcraft and component OEM recommendations, given the higher weights and repeated short-field operations.

Ensure pitot-static and RVSM systems are calibrated using appropriate test sets and adapters, particularly for aircraft equipped with advanced avionics and coupled autopilots.

For PT6 engines, follow the recommended hot-section intervals, trend-monitor engine parameters, and use proper engine covers and inlet plugs to minimize FOD and reduce environmental contamination risk.

Enduring Legacy

The King Air 350 stands as one of the most capable and widely deployed twin-turboprops in service, combining a spacious cabin, impressive range, and rugged field performance. From executive transport to air ambulance and maritime patrol, the 350 platform has earned a reputation for reliability and mission flexibility. Today’s 350i and 350ER models carry that legacy forward with modern avionics, quieter cabins, and mission-specific configurations that keep the design competitive well into the twenty-first century. 

For aviation maintenance professionals, the King Air 350 family is also one of the best-supported turboprop platforms in service, with abundant OEM and aftermarket parts, service bulletins, and upgrade programs available through Textron Aviation and third-party STC holders.

Ready to Service or Upgrade Your Beechcraft King Air 350?

As a leading Hawker Beechcraft and Textron Aviation parts supplier, PJi® offers a wide selection of replacement parts and consumables for the King Air 350 series, as well as components and accessories for the ground support equipment used to service these aircraft, including pitot-static test sets, oxygen and nitrogen servicing carts, aircraft tires, hydraulic fluids, ground power units, towbars, and aircraft jacks.

Our aviation specialists are ready to help you find the ideal parts, tooling, and GSE for your specific King Air 350 configuration, whether you are supporting a standard corporate shuttle, a medevac configuration, or a special-mission 350ER. Contact us today by phone, email, or chat, or browse the full catalog of compatible products and equipment to keep your King Air 350 flying safely, efficiently, and ready for its next mission.