Turboprop - Twin Engine (Legacy)
Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE): Complete Specs, Performance, and Buyer's Guide (2026)
Beechcraft
Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE): Complete Specs, Performance, and Buyer's Guide (2026)
The Beechcraft King Air C90 Legacy variants (encompassing the C90, C90-1, C90A, C90B, and C90SE produced between 1971 and 2005) represent the foundational and most-produced era of the iconic King Air 90 series before the modern PT6A-135A-powered C90GT/C90GTi/C90GTx variants succeeded the platform from 2006 onward. The King Air 90 series itself launched in 1964 (based on the Model 65 Queen Air, with the then-new Pratt & Whitney Canada PT6A turboprop powerplants replacing the earlier Queen Air's Lycoming IGSO-480-A1E6 flat-six piston engines). The Model C90 was introduced in 1971 with substantial upgrades including increased wingspan (4 ft 11 in / 1.50 m more than earlier models to 50 ft 3 in), MTOW increased by 350 lb to 9,650 lb, PT6A-20A engines, and bleed-air pressurization from the engines (vs earlier mechanical pressurization, though this increased cabin noise and reduced engine power). In 1976, the C90 switched to the PT6A-21 engine (550 shp each). 507 C90s were built through 1982. The Model C90-1 entered production in 1982 (54 built through 1984), featuring PT6A-21 engines + improvements to the pressurization system + stronger 200-series cabin door + double-pane windows + 5.0 PSID pressurization + increased ITT from 635° to 680° (resulting in 15+ knot cruise speed increase to 237 KTAS). The Model C90A was introduced in 1984 (235 built through 1992), featuring redesigned engine cowlings of the F90-1 (reducing drag, boosting ram airflow, 12 knot cruise increase), hydraulic landing gear, three-bus electrical system, rudder boost system, Collins Pro Line avionics in a new instrument panel designed to reduce single-pilot workload. C90A received MTOW increase to 10,100 lb in 1987. The Model C90B (1992-2005) followed with airframe improvements, four-bladed McCauley propellers (later Hartzell 90-inch 4-blade), propeller synchrophasing, dynamic vibration absorbers (DVA), bagged cabin insulation - all reducing cabin noise by as much as 15 dB vs previous models. First production C90B was fitted with the 10,000th PT6 engine delivered to Beechcraft. The cheaper C90SE "Special Edition" (1994-2005) introduced as poor man's version of the C90B with three-bladed Hartzell propellers, standardized interior, mechanical instruments (vs C90B's Collins EFIS-84), Bendix/King CNI-5000 avionics. 456 C90Bs + C90SEs built combined through end of 2005. Both C90B and C90SE powered by twin PT6A-21 engines flat-rated at 550 shp at ISA +18C, with 3,600-hour TBO. Cabin: 4.8 ft height, 4.5 ft width, 12.4-12.9 ft length (depending on variant). 6-7 passenger executive seating typical with 4-place club + airstair-door seat + belted lavatory seat + 26.5 cu ft aft baggage. Production succeeded by C90GT in 2006. Buyer beware: PT6A-6 and PT6A-20 engines (early King Air 90s) have extremely high overhaul costs + difficulty in parts availability, with some mechanics refusing to overhaul. PT6A-21 (C90, C90-1, C90A, C90B, C90SE) generally has better parts availability though still expensive.
For operators wanting Beechcraft's foundational King Air 90 series platform with substantial market availability, modest acquisition cost vs modern variants, single-pilot certified operation, twin-engine turboprop safety margin, Pratt & Whitney PT6A-21 engines, Beechcraft heritage quality, and the most-produced era of the King Air 90 series (507 C90s + 54 C90-1s + 235 C90As + 456 C90Bs/C90SEs = 1,252+ aircraft built combined between 1971 and 2005), the C90 Legacy variants represent Beechcraft's foundational + most accessible King Air twin-turboprop heritage.
Beechcraft King Air C90 Legacy Specifications at a Glance
| Specification | Value |
|---|---|
| Category | Turboprop - Twin Engine (Legacy) |
| Production Status | Discontinued 2005 (succeeded by C90GT from 2006) |
| Variants Covered | C90 (1971-1982), C90-1 (1982-1984), C90A (1984-1992), C90B (1992-2005), C90SE (1994-2005) |
| Manufacturer | Beechcraft (now Textron Aviation) |
| Family Heritage | King Air 90 series (since 1964, originated from Model 65 Queen Air) |
| Industry Distinction | Foundational + most-produced King Air 90 era |
| Industry Distinction | 1,252+ aircraft built combined (1971-2005) |
| Industry Distinction | Single-pilot certified, no type rating required |
| Industry Distinction | Twin-engine turboprop safety margin |
| Crew | 1 pilot (single-pilot certified, no type rating required) |
| Passengers (Typical) | 6 to 7 |
| Cabin Configuration | 4-place club + airstair-door seat + belted lavatory seat |
| Engines | 2× Pratt & Whitney Canada PT6A-21 turboprops (reverse-flow, free-turbine) |
| Engine Power (Flat-Rated) | 550 shp each at ISA +18C |
| Engine TBO | 3,600 hours |
| Propellers (C90B) | McCauley 4-blade (later Hartzell 90-inch 4-blade) constant-speed, auto-feathering, full-reversing |
| Propellers (C90A) | 3-blade aluminum constant-speed |
| Propellers (C90SE) | Hartzell 3-blade 93.4 inch full-feathering, reversible, constant-speed |
| Avionics (C90A) | Collins Pro Line |
| Avionics (C90B) | Collins EFIS-84 two-tube + WXR-270 weather radar + APS-65H autopilot + FIS-84 flight director + Collins Pro Line II comm/nav/ident |
| Avionics (C90SE) | Panel-mount Bendix/King CNI-5000 + KFC-250 autopilot + RDS-81 weather radar (electromechanical instruments) |
| Dynamic Vibration Absorbers (DVA) | C90B/C90SE only |
| Bagged Cabin Insulation | C90B/C90SE |
| Cabin Noise Reduction (C90B) | Up to 15 dB lower than previous King Air models |
| MTOW (C90) | 9,650 lb |
| MTOW (C90A from 1987) | 10,100 lb |
| MTOW (C90B initial) | 10,100 lb |
| MTOW (C90B later) | 10,500 lb (with Raisbeck) |
| Cabin Pressurization (C90-1) | 5.0 PSID |
| Cruise Speed (C90-1) | 237 KTAS |
| Cruise Speed (C90A) | 12 knot increase vs C90-1 |
| Wingspan (C90 onward) | 50 ft 3 in (15.32 m) |
| Cabin Length (per JetAV) | 12.4 ft (C90B) to 12.9 ft (C90A) |
| Cabin Height | 4.8 ft |
| Cabin Width | 4.5 ft |
| Aft Baggage Capacity | 26.5 cu ft |
| Service Ceiling | 30,000 ft (standard for class) |
| Production Totals | C90: 507 built (1971-1982) |
| Production Totals (C90-1) | 54 built (1982-1984) |
| Production Totals (C90A) | 235 built (1984-1992), 236 per JetAV |
| Production Totals (C90B + C90SE Combined) | 456 built (1992-2005) |
| Total Combined C90 Legacy | 1,252+ aircraft built |
| Pre-Owned Market | $250,000 (C90 1971) to $1,200,000 (C90B 2005) |
History as the Foundational King Air 90 Era
The C90 Legacy variants represent the foundational and most-produced era of the iconic King Air 90 series.
Platform timeline:
- 1964: King Air 90 launched (based on Model 65 Queen Air, first with PT6A turboprop)
- 1966: Model 65-A90 with PT6A-20 engines (206 built)
- 1968: Model B90 introduced (larger wingspan, recontoured rear fuselage, 350 lb gross weight increase, 184 built)
- 1971: Model C90 introduced (bleed-air pressurization, wingspan +4'11" to 50'3", MTOW +350 lb to 9,650 lb, PT6A-20A engines)
- 1976: C90 switches to PT6A-21 engines (550 shp each)
- 1982: C90-1 enters production (PT6A-21, ITT 635°→680°, 200-series cabin door, 5.0 PSID, 54 built)
- 1984: C90A enters production (redesigned cowlings, hydraulic landing gear, Collins Pro Line avionics, 235 built)
- 1986: Raisbeck Engineering certifies EPIC Performance Improvement Package for C90 models (Hartzell/Raisbeck 4-blade turbofan propellers + dual AFT body strakes + 10,100 lb gross weight)
- 1987: C90A MTOW increased to 10,100 lb
- 1992: C90B introduced (replaced C90A), 4-blade McCauley propellers, DVA, 15 dB cabin noise reduction, first fitted with 10,000th PT6 engine
- 1994: C90SE "Special Edition" introduced (3-blade props, mechanical instruments, lower cost)
- 2005: C90B + C90SE production ends (456 built combined)
- 2006: C90GT introduced (PT6A-135A engines, 750 shp flat-rated to 550, 275 KTAS cruise, succeeds C90 Legacy)
Per Wikipedia and AOPA, more than 3,100 King Air 90 + 100 series delivered as of August 2008.
Why the C90 Legacy Variants Are Foundational King Air Heritage
The C90 Legacy variants introduced industry-defining capabilities for the foundational King Air 90 era:
1. PT6A-21 Engine Power (550 shp Each)
The defining C90 Legacy engine:
- PT6A-21 reverse-flow, free-turbine turboprop: Modern proven
- 550 shp per engine flat-rated: Standard for class
- Industry-leading reliability: Commercial-proven
- 3,600-hour TBO: Modern intervals
- Twin-engine safety margin: Premium positioning
2. Bleed-Air Pressurization (vs Pre-C90 Mechanical)
- Used bleed air from the engines: Modern (though increased cabin noise + reduced engine power)
- 5 psi cabin differential (1976 onward): Modern positioning
- Industry-leading: Premium for era
- Modern positioning for foundational era: Premium
3. Increased Wingspan + MTOW (C90 onward)
- 50 ft 3 in wingspan: +4'11" vs earlier models
- 9,650 lb MTOW: +350 lb vs B90
- Modern operational envelope: Premium positioning
- Industry-leading for class: Premium
4. C90B Modern Refinements (1992-2005)
- 4-blade McCauley propellers (later Hartzell 90-inch): Modern
- Dynamic Vibration Absorbers (DVA): Industry-leading
- Bagged cabin insulation: Modern
- Up to 15 dB cabin noise reduction vs previous models: Industry-leading
- Improved acoustic insulation: Premium positioning
- First C90B fitted with 10,000th PT6 engine: Industry milestone
5. C90A Modern Improvements (1984-1992)
- Redesigned engine cowlings (F90-1 derived): Reduced drag, increased ram airflow
- 12 knot cruise speed increase: Premium positioning
- Hydraulic landing gear: Industry-leading (vs C90's electrical)
- Three-bus electrical system: Modern
- Rudder boost system: Modern single-engine workload reduction
- Collins Pro Line avionics: Modern integration
- Bonded spar cap: Industry-leading structural (vs cracking wing bolt concerns)
6. C90-1 Improvements (1982-1984)
- ITT 635° → 680°: Modern
- 15+ knot cruise speed increase: Premium positioning (237 KTAS)
- Stronger 200-series cabin door: Industry-leading
- Double-pane windows: Modern
- 5.0 PSID pressurization: Premium
7. C90SE Special Edition Cost Optimization
- 3-blade Hartzell propellers (vs C90B's 4-blade): Modest performance reduction
- Panel-mount radios + electromechanical instrumentation: Lower cost
- Bendix/King CNI-5000 avionics: Modern
- Single-pilot operation focus: Industry-leading
- Cabin features bagged insulation (vs DVA): Modest
8. Substantial Cabin (Foundation for Modern Variants)
- 4.8 ft height: Standard for class
- 4.5 ft width: Standard
- 12.4-12.9 ft length: Premium positioning
- 6-7 passenger executive seating: Standard
- 4-place club + airstair-door seat + belted lavatory seat: Industry-distinct
- 26.5 cu ft aft baggage: Modern
- Pressurized cabin: Industry-leading
Cabin Interior
The C90 Legacy cabin features compact but well-appointed dimensions:
| Cabin Measurement | Value |
|---|---|
| Cabin Length (per JetAV) | 12.4 ft (C90B) to 12.9 ft (C90A) |
| Cabin Height | 4.8 ft |
| Cabin Width | 4.5 ft |
| Aft Baggage Capacity | 26.5 cu ft |
Standard Configuration
- 6 to 7 Passengers Executive Seating: Premium positioning
- 4-Place Club Seating: Premium social
- Airstair-Door Seat (Single Forward-Facing): Standard
- Belted Lavatory Seat (Rear): Standard
- Aft Cabin/Lavatory Area: Standard
- C90B Redesigned Seats: +3 in additional legroom in club vs C90A
- C90B Sliding Partition Between Cabin and Flight Deck: Premium
Cabin Features (C90B Specific)
- 15 dB cabin noise reduction vs previous King Airs: Industry-leading
- Dynamic Vibration Absorbers (DVA): Modern
- Bagged cabin insulation: Premium
- 4-blade McCauley/Hartzell propellers: Modern (reduced noise)
- Propeller synchrophasing: Modern
- Modern fit + finish: Standard for foundational era
Cabin Features (C90SE Specific)
- Bagged cabin insulation: Standard
- Slightly noisier cabin than C90B (no DVA): Modest tradeoff
- 6 passengers all forward-facing + cockpit right seat: Modern
- Forward two seats turn 180° to face aft: Premium positioning (forward club configuration)
- Nose bay used as baggage compartment: Industry-distinct (panel-mount weight savings)
Performance
Speed and Range
| Performance Metric | C90 | C90-1 | C90A | C90B | C90SE |
|---|---|---|---|---|---|
| Cruise Speed | Standard 220 KTAS | 237 KTAS | +12 kt vs C90-1 | Similar to C90A | Similar to C90A |
| MTOW | 9,650 lb | 10,100 lb (1987+) | 10,100 lb | 10,100 → 10,500 lb | Similar |
| Engines | PT6A-20A → PT6A-21 | PT6A-21 | PT6A-21 | PT6A-21 | PT6A-21 |
| Engine Power | 550 shp | 550 shp | 550 shp | 550 shp | 550 shp |
Service Ceiling
| Variant | Service Ceiling |
|---|---|
| All C90 Legacy Variants | ~30,000 ft (standard for class) |
Typical Mission Examples
- New York to Atlanta (~750 nm) - non-stop with stops
- Coast-to-coast U.S.: Multi-leg standard
- Regional executive transportation: Premium positioning
- Foundational King Air operation: Industry-distinct
Engines
All C90 Legacy variants (C90 from 1976 onward, C90-1, C90A, C90B, C90SE) use two Pratt & Whitney Canada PT6A-21 reverse-flow, free-turbine turboprop engines:
- 550 shp per engine flat-rated at ISA +18C: Standard
- 3,600-hour TBO: Modern
- Modern reliability: Industry-leading
- Twin-engine safety margin: Premium positioning
Earlier C90 variants (1971-1976) used PT6A-20A engines (also 550 shp).
Buyer beware: PT6A-6 and PT6A-20 engines (from earlier King Air 90s, A90, B90) have extremely high overhaul costs and difficulty in locating parts. Some mechanics refuse to overhaul the PT6A-6 engines. PT6A-21 engines (C90 from 1976, C90-1, C90A, C90B, C90SE) generally have better parts availability, though parts are expensive. A 1,250-hour hot section inspection is recommended.
Avionics by Variant
| Variant | Avionics |
|---|---|
| C90 (1971-1982) | King 900 series dual nav/comm, KDF 800 ADF, KXP 755 transponder (later Collins VHF 20 comm + VIR 30 nav + TDR 90 transponder + ADF 60 + DME 40 + Sperry Primus 300 weather radar) |
| C90-1 (1982-1984) | Improved from C90 |
| C90A (1984-1992) | Collins Pro Line (new instrument panel designed to reduce single-pilot workload) |
| C90B (1992-2005) | Collins EFIS-84 two-tube + WXR-270 weather radar + APS-65H autopilot + FIS-84 flight director + Collins Pro Line II comm/nav/ident + DME (options: three-tube EFIS, EFD-84 radar, MFD-85 multifunction) |
| C90SE (1994-2005) | Panel-mount Bendix/King CNI-5000 + KFC-250 autopilot + RDS-81 weather radar (electromechanical instrumentation, lower cost) |
Operating Costs (Estimated)
| Cost Item | Per Hour |
|---|---|
| Fuel (~85-100 GPH) | $765 to $900 |
| Maintenance | $250 |
| Engine Reserve | $200 |
| Misc Variable | $150 |
| Total Variable Cost (Estimated) | ~$1,400 to $1,600/hr |
Annual operating budget at 250 hours: $350K-$400K all-in. Annual operating budget at 400 hours: $560K-$640K.
Operating cost: substantially lower than modern King Air variants due to age + lower MTOW + smaller engines.
Pricing
| Variant Era | Pre-Owned Price Range |
|---|---|
| 1971 to 1976 C90 (Pre-PT6A-21) | $250,000 to $400,000 |
| 1976 to 1982 C90 (PT6A-21) | $300,000 to $500,000 |
| 1982 to 1984 C90-1 | $400,000 to $600,000 |
| 1984 to 1992 C90A | $500,000 to $800,000 |
| 1992 to 2005 C90B | $700,000 to $1,200,000 |
| 1994 to 2005 C90SE | $500,000 to $900,000 |
Mission Profile
Best fit profiles:
- Entry-Level King Air Operators: Modest acquisition cost
- Owner-Pilot Operators: Single-pilot certified, no type rating required
- Step-Up From Single-Engine Piston: Twin-engine safety margin
- Regional Transportation Operators: 500-700 nm typical missions
- Twin-Engine Turboprop Safety Operators: Redundancy margin
- C90B Operators Valuing Quietest Legacy: 15 dB cabin noise reduction
- C90SE Operators Valuing Lower Acquisition Cost: Premium positioning
- Operators Valuing No Type Rating: Part 23 normal-category
Less suited if:
- You require modern cockpit (consider C90GTx with Pro Line 21)
- You require modern fuel efficiency (consider modern PC-12)
- You require 30,000+ ft consistent altitude (consider modern variants)
- You require 1,500+ nm range (consider King Air 250/260/360)
- You need stand-up cabin (4.8 ft height)
Pros and Cons
What the C90 Legacy Does Well
- Substantial market availability (1,252+ aircraft built)
- Modest acquisition cost ($250K to $1.2M depending on variant)
- Pratt & Whitney Canada PT6A-21 engines (proven reliability)
- 550 shp per engine (twin-engine safety margin)
- 3,600-hour TBO engines
- Single-pilot certified (no type rating)
- 6-7 passenger executive seating
- 4-place club + airstair-door seat + belted lavatory seat
- 26.5 cu ft aft baggage
- Pressurized cabin (5 psi C90-1+)
- C90B: 4-blade Hartzell/McCauley propellers
- C90B: Dynamic Vibration Absorbers (DVA)
- C90B: Bagged cabin insulation
- C90B: Up to 15 dB cabin noise reduction
- C90B: Propeller synchrophasing
- C90A: Redesigned cowlings (12 kt cruise increase)
- C90A: Hydraulic landing gear
- C90A: Collins Pro Line avionics
- C90A: Bonded spar cap (structural)
- C90A: Rudder boost system
- C90A: Three-bus electrical system
- C90-1: ITT 635°→680° (15+ kt cruise increase to 237 KTAS)
- C90-1: 5.0 PSID pressurization
- C90-1: Stronger 200-series cabin door
- C90-1: Double-pane windows
- C90SE: Lower acquisition cost option
- C90SE: Single-pilot operation focus
- Foundational King Air heritage
- More than 3,100 King Air 90/100 series delivered
- Beechcraft / Textron Aviation lifetime support
- Strong residual value within Legacy market
Tradeoffs to Understand
- PT6A-6 + PT6A-20 engines (early variants pre-1976): extremely high overhaul costs + parts availability concerns + some mechanics refuse to overhaul
- Older avionics vs modern G1000/Pro Line Fusion variants
- 30,000 ft service ceiling (vs modern King Airs at 35,000 ft)
- ~220-237 KTAS cruise (vs modern variants at 275-312 KTAS)
- 9,650 lb MTOW (vs modern variants at 10,485+ lb)
- 4.8 ft cabin height
- Production ended 2005 (C90B/SE); successor C90GT introduced 2006
Frequently Asked Questions
How is the C90B different from the C90A?
The C90B (1992-2005) replaced the C90A (1984-1992). Key improvements: 4-bladed McCauley propellers (later Hartzell 90-inch 4-blade, vs C90A's 3-blade aluminum), propeller synchrophasing, dynamic vibration absorbers (DVA), bagged cabin insulation, up to 15 dB cabin noise reduction vs previous King Airs. Redesigned seats allowing 1.5 in farther back / +3 in additional legroom in club. Sliding partition between cabin and flight deck. Collins EFIS-84 two-tube avionics (vs C90A's Collins Pro Line). First production C90B was fitted with the 10,000th PT6 engine delivered to Beechcraft.
How is the C90SE different from the C90B?
The C90SE "Special Edition" (1994-2005) is the lower-cost variant of the C90B. Key differences: 3-bladed Hartzell propellers (vs C90B's 4-bladed McCauley/Hartzell), panel-mount Bendix/King CNI-5000 avionics with electromechanical instrumentation (vs C90B's Collins EFIS-84 EFIS), standardized interior (vs C90B's premium customization), no dynamic vibration absorbers (vs C90B's DVA), slightly noisier cabin than C90B. Same PT6A-21 engines, same 550 shp per engine, same airframe.
How is the C90A different from the C90?
The C90A (1984-1992) succeeded the C90 (1971-1982) and C90-1 (1982-1984). Key improvements: redesigned engine cowlings (F90-1 derived, 12 knot cruise increase), hydraulic landing gear (vs C90's electrical), three-bus electrical system, rudder boost system (single-engine workload reduction), Collins Pro Line avionics in a new instrument panel designed to reduce single-pilot workload, bonded spar cap (structural improvement vs wing bolt cracking concerns), faired exhaust stacks. 1987 MTOW increase to 10,100 lb.
How is the C90 Legacy different from the C90GT (succeeded by GTi/GTx)?
The C90 Legacy variants (1971-2005) used PT6A-21 engines (550 shp each). The C90GT (2006-2008, 97 built) introduced PT6A-135A engines flat-rated to 550 shp - providing better climb and cruise performance due to lower operating temperatures, 275 KTAS cruise speed, and competitive performance with Very Light Jets over short to medium distances. The C90GTi (May 2007 onward) added Pro Line 21 avionics. The C90GTx (2010-2021) added factory winglets and increased MTOW to 10,485 lb.
What engines power the C90 Legacy variants?
The C90 (from 1976) onward and all C90-1, C90A, C90B, C90SE variants use two Pratt & Whitney Canada PT6A-21 reverse-flow, free-turbine turboprop engines (550 shp each flat-rated at ISA +18C). Earlier C90 variants (1971-1976) used PT6A-20A engines (also 550 shp). Pre-C90 King Airs (A90, B90, earliest 65-90s) used PT6A-6 or PT6A-20 engines - which have extremely high overhaul costs and parts availability concerns.
How many C90 Legacy aircraft were built?
Per Wikipedia and JetAV: 507 C90s (1971-1982), 54 C90-1s (1982-1984), 235 C90As (1984-1992, 236 per JetAV with all but 74 at increased MTOW), 456 C90Bs + C90SEs combined (1992-2005). Total combined C90 Legacy production: approximately 1,252+ aircraft built between 1971 and 2005. More than 3,100 King Air 90 + 100 series total delivered as of August 2008.
Should I buy a C90 with PT6A-6 or PT6A-20 engines?
Per AOPA's Beechcraft King Air 90 guide: "Due to extremely high overhaul costs and difficulty in locating parts, beware when purchasing a King Air with PT6A-6 and -20 engines. Some mechanics even refuse to overhaul the PT6A-6 engines." These engines are found on the earliest A90, B90, and pre-1976 C90 variants. PT6A-21 engines (all C90 Legacy variants from 1976 onward through C90SE/C90B 2005) generally have better parts availability though parts remain expensive.
Is the C90 Legacy single-pilot certified?
Yes. All C90 Legacy variants (C90, C90-1, C90A, C90B, C90SE) are single-pilot certified at their respective MTOWs in Part 23 normal-category. No type rating is required. The C90A's Collins Pro Line avionics were specifically designed to reduce single-pilot workload. The C90SE was designed for single-pilot operation as the lowest-cost King Air option.
What replaced the C90 Legacy variants in production?
The C90GT (2006-2008, 97 built) succeeded the C90 Legacy variants in production, introducing PT6A-135A engines (750 shp flat-rated to 550 shp) for better performance. The C90GTi (2008-2010) added Pro Line 21 avionics. The C90GTx (2010-2021) added factory winglets and increased MTOW. Beechcraft discontinued the entire King Air 90 family production in March 2021. Textron Aviation announced it intends to support the existing 90 series fleet indefinitely given the large number of aircraft being actively operated.
The Bottom Line
The Beechcraft King Air C90 Legacy variants (C90, C90-1, C90A, C90B, C90SE produced between 1971 and 2005) represent the foundational and most-produced era of the iconic King Air 90 series - before the modern PT6A-135A-powered C90GT/C90GTi/C90GTx variants succeeded the platform from 2006 onward. With substantial industry-defining capabilities (foundational King Air 90 era with approximately 1,252+ aircraft built combined between 1971 and 2005 representing the most-produced era of the King Air 90 series, twin Pratt & Whitney Canada PT6A-21 reverse-flow free-turbine turboprop engines providing 550 shp per engine flat-rated at ISA +18C with 3,600-hour TBO and proven commercial reliability, single-pilot certified Part 23 normal-category with no type rating required - making the C90 Legacy variants ideal for owner-pilot operations, modest acquisition cost ranging from $250K for early 1970s C90 to $1.2M for late-production C90B - substantially lower than modern King Air variants), the C90 Legacy variants delivered Beechcraft's foundational twin-turboprop heritage. Variant evolution: the C90 introduced in 1971 with increased wingspan (50 ft 3 in, +4'11"), MTOW 9,650 lb (+350 lb), and PT6A-20A engines (switching to PT6A-21 in 1976) - 507 built through 1982. The C90-1 (1982-1984, 54 built) introduced ITT increase from 635° to 680° for +15 knot cruise speed to 237 KTAS, stronger 200-series cabin door, double-pane windows, and 5.0 PSID pressurization. The C90A (1984-1992, 235 built, 236 per JetAV) introduced redesigned F90-1-derived engine cowlings for +12 knot cruise increase, hydraulic landing gear, three-bus electrical system, rudder boost system for single-engine workload reduction, Collins Pro Line avionics in a new instrument panel designed to reduce single-pilot workload, bonded spar cap structural improvement, and 1987 MTOW increase to 10,100 lb. The C90B (1992-2005) introduced 4-blade McCauley/Hartzell 90-inch propellers, propeller synchrophasing, dynamic vibration absorbers (DVA), bagged cabin insulation, and up to 15 dB cabin noise reduction vs previous models - the first production C90B was fitted with the 10,000th PT6 engine delivered to Beechcraft. The C90SE "Special Edition" (1994-2005) was introduced as the lower-cost variant with 3-blade Hartzell propellers, panel-mount Bendix/King CNI-5000 avionics with electromechanical instrumentation, and standardized interior. 456 C90Bs + C90SEs were built combined through end of 2005. Cabin: 4.8 ft height, 4.5 ft width, 12.4-12.9 ft length depending on variant, 6-7 passenger executive seating typical with 4-place club + airstair-door seat + belted lavatory seat + 26.5 cu ft aft baggage. Buyer beware: Pre-1976 King Airs with PT6A-6 and PT6A-20 engines (A90, B90, earliest C90s) have extremely high overhaul costs and difficulty in parts availability - some mechanics refuse to overhaul PT6A-6 engines per AOPA. PT6A-21 engines (all C90 Legacy variants from 1976 onward through C90SE/C90B 2005) generally have better parts availability though parts remain expensive. A 1,250-hour hot section inspection is recommended. Production was succeeded by the C90GT in 2006 (PT6A-135A engines, 275 KTAS cruise) through the C90GTi (Pro Line 21 avionics from 2008) and C90GTx (factory winglets from 2010). Beechcraft discontinued the entire King Air 90 family production in March 2021. Textron Aviation intends to support the existing 90 series fleet indefinitely given the large number of aircraft being actively operated. The C90 Legacy variants delivered the foundational King Air 90 heritage and remain widely available in the pre-owned market today.
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Book a Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE) on the Quantum Jets App by AVIA Technologies
The Quantum Jets mobile app, built by AVIA Technologies, is the private jet charter marketplace app for the Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE) and the rest of the Quantum Jets catalog. The Quantum Jets app is available as an iOS app on the Apple App Store and as an Android app on Google Play. Whether the goal is a one-off jet charter, recurring private jet rental, a private jet card program, or a deeper engagement spanning aircraft purchase, jet purchase, jet sales, aircraft management, jet management, private jet management, aircraft maintenance, aircraft refurbishment, fractional jet access, aircraft lease, aircraft leasing, or aircraft sales, the Quantum Jets app surfaces live Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE) availability and routes the booking through the Quantum Jets brokerage team.
AVIA Technologies is the technology platform behind the Quantum Jets mobile app. The AVIA Technologies app powers the private jet charter marketplace experience: search the catalog, compare a Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE) against alternatives in the same tier, pull live pricing, request a charter quote, schedule aircraft maintenance, list a Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE) for jet sales, manage a fleet under aircraft management or private jet management, and execute a private jet card purchase, all from one private jet app. The Quantum Jets app and the AVIA Technologies app share the same backend so client data, trip history, and aircraft preferences carry across both surfaces.
Download the Quantum Jets app on the Apple App Store (iOS app) or Google Play (Android app), then search the Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE) to start booking. The Quantum Jets mobile app is the fastest path from research to booking for any private jet, jet charter, private jet rental, or private jet charter marketplace transaction in the Quantum Jets catalog. AVIA Technologies maintains the private jet charter marketplace app on a continuous deployment schedule with new aircraft, new operators, and refined private jet management tooling shipping every release.
Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE) Services from Quantum Jets
Quantum Jets supports Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE) operators and prospective owners across the full lifecycle of private jet ownership. Whether the goal is jet charter for a one-off trip, a private jet rental for a busy season, or a private jet charter program tied to a recurring travel pattern, our team builds the right structure around the Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE) for the mission.
For buyers, our aircraft purchase and jet purchase advisory walks through inspection, valuation, financing, and closing. Jet sales and aircraft sales clients work with our team to position the Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE) for the strongest possible exit, with market intelligence on every comparable transaction. A private jet card program through Quantum Jets is a lower-commitment way to access Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE)-class lift without a full aircraft purchase, and is structured to credit toward a future jet purchase when the time is right.
Once an aircraft is in hand, aircraft management and jet management at Quantum Jets cover crew, scheduling, regulatory compliance, charter revenue programs, and detailed reporting. Private jet management is structured to keep the Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE) flying safely and profitably with minimum owner overhead. Aircraft maintenance is coordinated through manufacturer-authorized service centers, and aircraft refurbishment programs (interior, paint, avionics, connectivity) are managed end-to-end so the Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE) retains residual value over its operating life.
Fractional jet programs are available for Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE)-class travelers who want guaranteed access without sole ownership. Aircraft lease and aircraft leasing arrangements (operating, finance, dry, wet) are structured to match the operator's hours, geography, and balance sheet. The Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE) fits naturally into all of these structures, and Quantum Jets handles the structuring, documentation, and lifecycle service so the owner can focus on flying.
If you are evaluating a Beechcraft King Air C90 Legacy (C90, C90-1, C90A, C90B, C90SE) for purchase, charter, lease, fractional access, management, refurbishment, or sale, talk to a Quantum Jets broker for a custom market scan and pre-buy diligence.
Related Aircraft Guides:
- Beechcraft King Air C90GTx: Modern Final-Variant Successor (Factory Winglets, 2010-2021)
- Beechcraft King Air C90GTi: Pro Line 21 Avionics Variant (2008-2010)
- Beechcraft King Air C90GT: PT6A-135A Engine Successor (2006-2008)
- Beechcraft King Air 250: Larger Twin-Engine Sibling (2011-2020)
- Beechcraft King Air 260: Current Production Sibling (2020-Present)
- Beechcraft King Air 360: Largest Current Production Sibling (Type Rating Required)
- Beechcraft King Air 360ER: Special-Mission Extended-Range Sibling
- Cessna Conquest II: Twin-Engine Turboprop Competitor (Legacy)
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Production of all Beechcraft King Air C90 Legacy variants (C90, C90-1, C90A, C90B, C90SE) ended by 2005. All acquisitions are pre-owned. Textron Aviation provides worldwide parts/support for the King Air 90 series indefinitely. Beechcraft discontinued the entire King Air 90 family production in March 2021. Specifications accurate as of 2026.