Flight Design CT / CTLS / F2

The Flight Design CT series is one of the best-selling light-sport aircraft families in the world, with over 2,000 delivered across more than 60 countries since production began in 1997. Designed in Germany by Flight Design GmbH (founded 1993), the CT line established a benchmark for what an LSA can achieve: 115 KTAS cruise, 800+ nm range, and a generous useful load from a two-seat composite airframe burning 4–5 GPH on a Rotax 912.

The aircraft traces its lineage from European ultralight regulations. The original CT debuted in 1996, followed by the CT2K, the short-wing CTSW (widely used for FAA S-LSA compliance after the 2004 LSA rule), the CTLS with revised tail and landing gear in 2008, the fuel-injected CTLSi in 2012, and the next-generation F2 in 2019. The companion CTMC (Metal Concept) variant uses welded steel and aluminum construction aimed at flight training durability.

All CT variants share a high-wing, side-by-side composite airframe with a Rotax engine, fixed tricycle gear, slotted flaps, and an all-moving horizontal stabilator. The BRS whole-airframe parachute system — standard on most production models — has saved lives in multiple documented CT deployments and is a meaningful safety differentiator versus most other LSA designs.

Production and company note: Flight Design GmbH entered insolvency in 2016 due to financial difficulties; LiftAir acquired the company in 2017 and resumed deliveries. The Ukraine war disrupted production at the Kherson factory beginning in 2022. Flight Design filed for insolvency again in December 2024 following the loss of Ukrainian production capacity, with restructuring underway from a Czech Republic facility. This creates parts and support uncertainty for new buyers that should be factored into pre-purchase analysis.

As of 2026, the CTLS/CTLSi remains the core product, with approximately 362 FAA-registered CTLS and CTSW models in the US fleet. Used examples from $55,000 (early CTSW) to $160,000 (recent CTLSi) are the primary market. New production pricing is uncertain pending restructuring resolution.

The CTLS to CTLSi transition in 2012 is the most important single upgrade in the line. The Rotax 912iS fuel injection cuts fuel burn from ~5.5 GPH to ~4.3 GPH at cruise, eliminates carburetor icing concerns, improves high-altitude performance, and the dual-channel FADEC electronic ignition reduces spark plug and magneto maintenance. Most CTLS operators consider the 912iS well worth the premium on used aircraft.

The F2 represents a genuine redesign — 4 feet more wingspan (34 ft vs 28'2"), 3 inches wider cabin, 2 inches taller, 10 inches longer, with a 25% larger door opening and a lower sill entry height. The carbon fiber structure uses prepreg layup (vs. wet layup on the CT series) for better consistency. The F2 with the 915iS turbocharged engine (141 HP) cruises at ~130 KTAS.

The CTLSi's published numbers are 115 KTAS at 75% power on 4.3 GPH, with 830 nm maximum range. Real-world pilots report 5–6 GPH at normal cruise, and 800 nm range with VFR reserves — consistent with factory figures. At economy cruise (55–60% power), fuel burn drops to 3–3.5 GPH with airspeed of 105–110 KTAS, enabling extraordinary endurance of 7+ hours on 34 gallons.

The CTLS is not a STOL performer despite its high-wing configuration. The 460-foot ground roll (published, sea level, standard day, max gross) is good but not remarkable. The slotted high-lift flaps help Vs0 to 39 KIAS, enabling approach at 55–60 KIAS. Obstacle clearance performance (takeoff over 50 ft obstacle: ~820 ft) is competitive with similarly powered certified aircraft.

Rate of climb at 805 FPM (published) is adequate but the CT climbs more efficiently at Vy (71 KIAS) than feels intuitive to pilots used to certificated aircraft with lower Vy speeds. Density altitude affects performance significantly — the naturally-aspirated 912ULS/912iS produces full power only at sea level. Plan for 10–15% climb performance reduction per 3,000 ft of density altitude.

The CTLS service ceiling is 15,000 ft. The CTHL variant with the turbocharged Rotax 914 extended this meaningfully for operations over mountainous terrain. The carbureted 912ULS is susceptible to carburetor icing in IMC-adjacent conditions — a limitation the fuel-injected 912iS eliminates.

The VNE of 145 KIAS is the published figure for the CTLSi (flightdesignusa.com spec sheet). The CTSW's VNE was listed at 163 KIAS (300 km/h) in the European ultralight certification, but the US S-LSA documentation used the lower number. Pilots should always reference their specific variant's limitations.

The CT is universally described as "light and responsive" on controls with a noticeably different feel than standard-category aircraft. The side-stick control (rather than a conventional yoke) and the all-moving horizontal stabilator contribute to a sensitive pitch response. Visibility from the high wing is excellent. The cockpit is positioned such that pilots sit "out over the wing strut," which can complicate landing flare judgment — most CTLS pilots tape a reference mark on the windshield until the sight picture is ingrained.

CTLSi (Rotax 912iS, 100 HP, 34 gal usable, 1,320 lb gross, 800 lb empty weight)

Useful load = 520 lbs. Max fuel weight = 204 lbs (34 gal × 6.0 lb/gal).

Payload note: The CTLS has a published useful load of approximately 520–552 lbs depending on installed equipment and variant. Empty weight varies; heavier avionics configurations reduce useful load. Verify actual empty weight from aircraft weight-and-balance document — factory "typical" empty weight of 717–810 lbs means real-world useful load can range from 510 to 600 lbs.

Key constraint: Two average-weight US adults (170 lbs each = 340 lbs combined) leave only 180 lbs for fuel and bags on a 520-lb useful load aircraft. Full fuel (204 lbs) with two average pilots is not possible. Practical two-occupant loading typically means 17–25 gallons of fuel, limiting range to 300–600 nm. For true long-range solo flight, the CT shines; for two-up long-range flying, careful weight planning is required.

F2 comparison (Rotax 912iS, 34 gal, 1,320 lb gross, 840 lb empty):

• Useful load: 480 lbs — less than the CTLS due to heavier empty weight from wider cabin/safety features
• Two 170-lb pilots (340 lbs) leave only 140 lbs for fuel — approximately 23 gallons, or ~450 nm range
• F2 is best understood as a comfort-optimized aircraft, not a payload maximizer

Base/Entry (older used CTSW/CTLS, ~2005–2010): Dual Dynon D100/D120 EFIS screens, Garmin 496 GPS, SL30 nav/comm, GTX 327 transponder. Adequate for VFR. Many mid-market used examples fall in this tier.

Mid-tier (CTLS/CTLSi, ~2010–2016): Dual 7-inch Dynon SkyView screens, Garmin aera 796 or 796/796 GPS, SL40 comm, GTX 330 Mode-S transponder, traffic information service (TIS). ADS-B In via Dynon. Most CTLS in the $90K–$130K range are in this tier.

Premium (recent CTLSi, ~2016–present): Dual 10-inch Dynon SkyView HDX displays with synthetic vision (SVS), Dynon SV-2 autopilot, GTX 345 ADS-B In/Out transponder, integrated engine monitoring, battery backup on all screens. Factory-configured pricing at this tier is $150K–$170K used.

F2 Standard: Dual 10-inch Garmin G3X Touch with EFIS/MFD functionality, GTX 345 transponder, G5 standby display, optional GFC 500 autopilot with envelope protection. The G3X integration with the Rotax 912iS engine management system provides comprehensive engine diagnostics and digital checklists.

Per avionics-pricing: upgrading an older Dynon D-series panel to SkyView HDX typically runs $8,000–$15,000 installed. Factory-fresh CTLSi and F2 avionics represent good value versus aftermarket upgrades on early CT models.

S-LSA aircraft operate under ASTM standards, not FAA Part 23. Modifications must be approved through manufacturer-issued service documentation rather than STCs. Key approved modifications:

Engine:

• Rotax 912iS upgrade (carbureted 912ULS to fuel-injected 912iS): Factory-approved conversion. Eliminates carb icing, reduces fuel burn 21%, improves starts. Approximate cost: $10,000–$15,000 installed including airframe harness and ECU wiring.
• Rotax 914 (turbocharged) installation: Available for CTHL variant; limited applicability to standard CTLS.

Structural / Cosmetic:

• 600 kg (1,323 lb) gross weight increase: DAeC-approved for newer CTLS models; upgrades standard 600 kg (1,320 lb) models. Most current production CTLS are delivered at 600 kg; conversion available at authorized Flight Design maintenance facilities.
• LED landing/position/strobe lights: Manufacturer-approved replacement for incandescent. Reduces electrical load and improves visibility. Cost: $800–$1,500.
• Electric trim system: Aftermarket electric elevator trim upgrade available through authorized dealers. Reduces workload, especially on longer cross-country flights. Cost: ~$2,000 installed.
• Wheel fairings: Factory option; improve cruise by 2–3 knots.

BRS Parachute:

• BRS-1350 HS repack: Required every 6 years (or per BRS inspection schedule). Cost: ~$1,000–$1,500 at certified BRS shop.
• BRS-1350 replacement: If parachute is beyond service life, replacement is $5,000–$8,000.

Per maintenance-ecosystem:

Routine maintenance:

• Condition inspection (annual equivalent): $700–$900. The S-LSA annual is simpler than a Part 23 annual — no required airframe overhaul items, manufacturer-defined inspection procedures. Must be performed by FAA-certificated A&P or LSA Repairman (Maintenance).
• Rotax 100-hour inspection: ~$250–$450 flat-rate at a Rotax-authorized shop. Includes carburetor sync (912ULS) or fuel injection check (912iS), oil/filter change, gearbox check.
• Carburetor sync (912ULS only): Required at 200-hour intervals; ~$250.
• Gearbox inspection: 1,000-hour interval (or 600 hours if >50% 100LL operation); ~$300.
• Propeller inspection: 1,500-hour interval; ~$450.
• BRS parachute repack: Every 6 years; ~$1,000–$1,500.
• Rubber hose replacement: Every 5 calendar years; ~$4,000 including labor. This is the largest single routine maintenance expense.

Engine overhaul:

• Rotax 912ULS TBO: 1,500–2,000 hours (2,000 hr TBO with regular oil analysis). Overhaul cost: $10,000–$15,000 exchange.
• Rotax 912iS TBO: 2,000 hours. Overhaul cost: $15,000–$20,000 exchange.
• Engine reserve: ~$8–$10/hour for 912ULS; ~$9–$10/hour for 912iS.

Mechanic availability:

• LSA Repairman (Maintenance) certificate required for condition inspections on S-LSA. Pilots can obtain an LSA Repairman (Inspection) certificate to perform their own condition inspections (not the case for standard-category aircraft).
• Rotax 912 mechanics: Rotax-authorized service centers are widespread in the US; Rotax parts are readily available through Aircraft Spruce, Lockwood Aviation, and other suppliers regardless of Flight Design's manufacturer status.
• Airframe parts: Composite panels, canopy, gear, and fuselage parts flow through Flight Design USA (Airtime Aviation as of 2024). The manufacturer's December 2024 insolvency increases long-term risk for unique airframe parts. CTSW/CTLS airframe parts availability is rated "fair" due to this uncertainty.

Annual operating cost estimate (100 hrs/year):

• Fuel (4.3 GPH, $6.00/gal mogas average): ~$2,580
• Annual inspection: ~$800
• Rotax 100-hr service: ~$350
• BRS repack reserve: ~$250/year (amortized over 6 years)
• Engine overhaul reserve: ~$900/year
• Hose replacement reserve: ~$800/year (amortized over 5 years)
• Other maintenance, oil: ~$500
• Total direct operating costs: ~$6,180/year (~$62/hour)
• Add hangar ($2,400–$6,000/year) and insurance ($1,200–$2,000/year) for full ownership cost.

Per valuation-methodology:

Price tiers (2024–2026 market):

Key value drivers:

• Engine variant: 912iS fuel-injected models command a $15,000–$25,000 premium over carbureted 912ULS equivalents of the same year.
• Avionics configuration: Dual Dynon SkyView HDX or Garmin G3X panel adds $10,000–$20,000 versus legacy Dynon D-series equipment.
• BRS parachute status: Parachute within repack interval (current) vs. overdue repack is a ~$1,500 buyer cost. A parachute approaching end-of-service-life ($8,000 replacement) should be reflected in price negotiations.
• Documentation quality: Thorough maintenance records (Safety Directive log, hose replacement, oil change intervals, gear inspection) add $5,000–$10,000 to justified market value.
• Engine TBO remaining: 912iS at 2,000-hr TBO — each 500 hours of remaining life is worth approximately $3,000–$4,000 versus a mid-time engine.
• Manufacturer insolvency risk (2025–2026): Flight Design's December 2024 insolvency filing has introduced uncertainty around parts support. This is likely to compress prices for all variants, especially newer aircraft dependent on manufacturer parts supply. Early CTSW/CTLS models with widely-available parts are relatively insulated.
• Gear service history (CTSW): Nose gear service bulletin compliance is a meaningful value factor on CTSW examples.

S-LSA aircraft are not subject to FAA Airworthiness Directives. Instead, Flight Design issues Safety Directives (Service Notices, Service Bulletins, Safety Alerts), compliance with which must be recorded per ASTM standards. CTLS owners must maintain current records of all applicable Safety Directives — a requirement not always met on poorly-maintained used aircraft.

CTSW-specific issues (important for pre-buy on 2003–2008 aircraft):

• Nosewheel shimmy and steering: Early CTSW nose gear design had documented shimmy issues and gear failures under hard landings. Flight Design issued service bulletins for reinforcement. Verify service bulletin compliance and inspect nose gear strut, rod ends, and steering mechanism for wear.
• Landing gear fractures: Composite main gear legs have fractured on hard or sideways landings. The problem was partly attributed to inadequate pilot checkout — the CT requires landing on main wheels, not the nose. Inspect main gear attach points and gear legs for cracks. Replacement gear is $1,500–$3,000 per leg.

CTLS/CTLSi issues (2008-present):

• Rotax oil maintenance: CT aircraft frequently flown on 100LL require oil and filter changes every 25 hours (vs. 100 hours on mogas). "Lead mud" accumulation in the oil tank from 100LL operation without adequate oil change intervals is a red flag on pre-buy. Inspect the oil tank interior.
• Five-year hose replacement: Rotax 912 rubber hoses (coolant, fuel, breather) must be replaced on a 5-year calendar interval regardless of hours. Average cost: $4,000. Verify this was done — failure to replace aging hoses is a known cause of engine problems.
• Canopy seals and trim tab deformation: Aircraft left outside can develop leaking canopy seals (water intrusion) and tail trim tab deformation from sun/heat exposure. Inspect for warping or paint separation on the horizontal stabilator trim tab.
• Wingtip strobe haziness: Wing-tip strobe lenses become milky on aircraft that have sat outside in UV exposure. Cosmetic but indicative of overall storage quality.
• Oil return line disconnection: Documented failure mode where oil return lines become disconnected, potentially leading to rapid oil loss and engine failure. Inspect all oil line connections and verify service bulletin compliance.
• Composite repair history: Composite damage must be repaired per manufacturer procedures. Inspect belly, wing leading edges, and nose for non-standard repairs. Poor composite repairs are expensive to remediate.

Pre-buy essentials:

• Full logbook review: look for frequent oil changes (sign of 100LL use), BRS inspection/repack dates, hose replacement records, gear repairs, and Safety Directive compliance log.
• Detailed condition inspection write-up (at least 1 page of findings) indicates thorough maintenance. Short three-line annual write-ups are a red flag. Well-documented aircraft command a $5,000–$10,000 premium but are worth it.
• Verify nose gear strut condition (CTSW especially) and main gear attach point inspection.
• Check manufacturer support status — parts availability has become a concern given the December 2024 insolvency filing.

Per insurance-underwriting:

Typical annual premiums (2024–2025):

• Hull + liability ($100,000 hull / $1M liability / $100K per-passenger): ~$1,617/year
• Hull + liability (no per-passenger sublimit, $100K hull): ~$2,098/year
• Range for typical used CTLS: $900–$2,000/year depending on hull value, pilot experience, and liability limits selected

Underwriting factors specific to LSA/CTLS:

• Pilot hours: Pilots with 250+ total hours and 25+ hours in make/model receive the most favorable rates. Low-time sport pilots (<100 hours) face higher premiums and may require a CFI checkout hour before coverage binds.
• Sport Pilot certificate: Sport Pilot holders (vs. Private Pilot with SP privileges) are accepted by all major LSA insurers. Some insurers require BasicMed or medical certificate for higher coverage limits.
• BRS parachute: Some underwriters offer a modest discount for BRS-equipped aircraft; others treat it as neutral. Confirm with your broker.
• Flight school use: Commercial training operations require a different policy structure, typically $2,000–$3,500/year for fleet coverage.
• Lapsed repack: An overdue BRS repack can complicate hull coverage. Maintain current repack status.

Primary LSA insurers: USAIG, Global Aerospace, Avemco, and Skywatch AI write LSA coverage. BWI and Aviation Insurance Resources (AIR) are common brokers. Skywatch AI offers usage-based/hourly LSA coverage which may benefit low-utilization owners.