Cessna Conquest I/II

The Conquest family represents Cessna's only purpose-built cabin-class turboprop twins, bridging the gap between piston twins like the cessna-414-421 and bizjets. Two distinct airframes share the Conquest name:

• Cessna 441 Conquest II (1977–1986): The senior sibling, launched first. Powered by Garrett/Honeywell TPE331 engines with four-blade props. A true FL350 machine that cruises above 300 KTAS and hauls six adults 1,200+ nm. Roughly 362 built.
• Cessna 425 Corsair / Conquest I (1980–1986): A pressurized 421 Golden Eagle airframe re-engined with Pratt & Whitney Canada PT6A-112s. Originally called the Corsair, renamed Conquest I in 1983 when MTOW bumped to 8,600 lb. About 236 built.

The Conquests are the owner-flown turboprop twin of choice for pilots who want jet-like capability (FL280–FL350, pressurization, known-ice, dispatch reliability) without the fuel burn or training cost of a Citation. Both are single-pilot certified. Both are genuinely fast — the 441 with -10 engines is the fastest production turboprop twin ever built, faster than many light jets in the low-to-mid flight levels.

Nearly every 441 flying today has been upgraded to TPE331-10 engines — the -8 is considered obsolete due to shorter TBO and worse hot/high performance.

The frontmatter numbers reflect the 441 Conquest II with TPE331-10 engines as the flagship of the family. Key 425 Conquest I deltas:

• Cruise: 425 trues 255–260 KTAS at FL240–280 economy, 210 KTAS long-range at FL300. About 50 KTAS slower than a -10-equipped 441.
• Ceiling: 425 service ceiling 34,700 ft; 441 is certified to FL350.
• Fuel burn: 425 burns roughly 58–62 gph in cruise vs. 75 gph for a 441 at high cruise. 441 at long-range FL350 drops to ~50 gph.
• Pressurization: 425 uses 5.0 psi differential (10,000-ft cabin at FL280). 441 uses 6.3 psi differential (10,900-ft cabin at FL350).
• Climb: 425 climbs at ~2,027 fpm; 441 at ~2,435 fpm sea-level, single-engine ~715 fpm.

Real-world: a 441 with -10s and clean airframe will see 305–315 KTAS block speeds on legs over 500 nm. The 425 is squarely in the 240–255 KTAS bracket — competitive with a King Air C90 but with a quieter, wider cabin inherited from the 421.

Blackhawk's XP modification for the 425 replaces the -112 with a PT6A-135A, restoring rated power to higher altitudes and adding ~20 KTAS above 18,000 ft plus substantially better climb.

Cessna 425 Conquest I (8,600 lb MTOW, ~1,673 lb useful load, 366 gal / 2,452 lb usable fuel):

• Full fuel + 2 pax: Tanks full at 2,452 lb leaves negative useful payload — the 425 cannot tanker full fuel with any passengers at max gross. Typical mission: 250 gal / 1,675 lb fuel, 4 adults + bags, ~900 nm still-air range.
• 4 adults + bags (~900 lb): ~775 lb for fuel = ~115 gal, roughly 450 nm with reserves.
• Realistic business mission: 4 pax, 250 gal fuel, FL240–FL280, ~240 KTAS, 900–1,100 nm.

Cessna 441 Conquest II (10,165 lb MTOW, ~4,484 lb useful load, ~475 gal / 3,182 lb usable fuel):

• Full fuel + 2 pax + bags: Full fuel burns 3,182 lb of useful load, leaving ~1,300 lb for people and bags — four adults and light baggage feasible with full tanks. True ~2,000 nm range at long-range cruise.
• 6 adults + bags (~1,300 lb): ~3,184 lb for fuel = full tanks, still the ~2,000 nm book range.
• Realistic charter mission: 6 pax, full fuel, FL290–FL350, 300–315 KTAS, 1,200–1,400 nm with NBAA IFR reserves.

The 441's useful load is the reason it's considered a genuine owner-flown replacement for light jets on mission profiles up to ~1,500 nm: it carries what it says on the brochure.

• Business travel (10): Core mission. Cabin-class, stand-up-ish cabin, air-stair door, pressurized, known-ice, FL280–FL350, single-pilot legal. Owner-flown business machine.
• Cross-country (10): 1,200–2,000 nm range depending on config, above-the-weather altitudes, near-jet speeds. The 441 in particular rivals light jets on 500–1,000 nm legs.
• Cargo hauling (7): 2,000+ lb useful load after fuel in the 441. Several are operated as Part 135 freight haulers. 425 has less payload flexibility.
• Surveying (6): Good cabin volume and stable platform; fuel burn penalizes long loiter, but the pressurization and speed help on transit and high-altitude work.
• Backcountry (2): Retractable gear, low-wing, long takeoff rolls, and turbine maintenance infrastructure make it wrong for unimproved strips.
• Flight training (1) and aerobatics (1): Not remotely suitable.
• Local fun (2): Direct operating costs exceed $1,500–$2,400/hr. Not a $100-hamburger airplane.

Factory panels are RCA/Collins/King hybrids from the early 1980s: dual KFC-300 or Sperry SPZ-500 autopilots, KNS-81 RNAVs, weather radar. Original panels are obsolete for modern RVSM and ADS-B compliance.

Typical modern upgrade tiers:

• Entry ($1.0–1.3M asking): Legacy panel, Garmin GTN 750 or dual GTN 650s retrofit, Garmin GTX 345 ADS-B, original SPZ-500 autopilot still in service, no RVSM (capped at FL280).
• Mid ($1.3–1.6M): Garmin G600 TXi or dual G600, GTN 750Xi/650Xi, GFC 600 autopilot on the 441 (when STC available), RVSM certified for the 441, Garmin GWX radar.
• Top ($1.6–1.9M): Full Garmin G600 TXi glass with dual TXi displays, synthetic vision, GFC autopilot, RVSM, fresh paint/interior, recent SIDs compliance, mid-time or Blackhawk engines.

RVSM compliance is a ~$75K–150K add-on for the 441 and is essentially required to use the airplane's FL350 ceiling on IFR flight plans in domestic US airspace.

• Blackhawk XP Conquest I: PT6A-135A upgrade for 425, ~+20 KTAS at altitude and better climb. See valuation-methodology for engine upgrade valuation impact.
• Four-blade MT or Hartzell props (441): Reduces cabin noise, improves climb and ground clearance, standard on -10 variants.
• Dash-10 engine conversion (441): Replaces TPE331-8 with -10 cores, extending TBO to 5,400 hr and improving hot/high performance — nearly universal on the in-service fleet.
• Garmin GFC 600 autopilot STC (441): Available and increasingly common; ~$80–120K installed.
• RVSM certification package (441): Required for FL290+ filing.
• Aux fuel tanks: Some 441s have extended tip tanks pushing range past 2,100 nm.
• Winglets: A few aftermarket winglet kits exist for the 441 with marginal cruise benefit.

• Parts availability: Good but not excellent. Textron still supports both models, and specialty shops (West Star, Stevens, Yingling, Elliott) carry parts. Some legacy avionics and bladder parts have lead times.
• A&P familiarity: Specialist — the TPE331 in particular requires trained turbine mechanics, and the 441's SIDs/spar AD demand experienced Conquest shops.
• Annual inspection cost: $15K–35K routine; $50K+ in SID years.
• Direct operating cost: ~$1,400–$2,400 per hour all-in depending on fuel price, utilization, and engine reserve assumptions. Conklin & de Decker pegs a -10 Conquest II at roughly $2,389/hr at 450 hr/yr utilization.
• Total annual budget (450 hr/yr): $600K–$1.08M for the 441; $400K–$650K for the 425.
• Expensive line items: Hot section inspections, prop overhauls ($15K+ per), tire/brake ($8K+ per event), pressurization repairs, wing spar AD.

Comparison: pilatus-pc12 is cheaper to feed on a per-seat basis (single engine) but more expensive to buy; daher-tbm is faster and more fuel efficient but offers less cabin.

Price spreads are wide because the fleet is bifurcated between airplanes with current SIDs / mid-life engines / glass panels and those deferred on all three fronts.

• Cessna 425 Conquest I: ~$600K–$1.1M. Low end is high-time engines, legacy panel, deferred SIDs. Top-end Blackhawk-modified, glass-panel 425s crack $1.2M.
• Cessna 441 Conquest II: ~$800K–$1.89M. TPE331-10, RVSM, full SIDs, and Garmin glass are the three value drivers. A SID-compliant, RVSM-equipped, low-time-engine 441 with TXi glass trades near the top of the range.

Engine TBO status is the largest single variable: a fresh pair of PT6A-112s represents $550–650K in overhaul value; a fresh pair of TPE331-10s represents $500–600K. See valuation-methodology for overhaul-value capitalization logic.

• AD 2012-10-04 / Cessna 441 wing spar: The defining AD for the 441. Requires recurring inspection of the wing carry-through spar for fatigue cracks. Initial compliance runs $40K–120K depending on findings; recurring inspections every 200–1,000 hours depending on wing spar hours.
• Cessna SID program (Supplemental Inspection Documents): Mandatory in many jurisdictions and strongly advised in the US. Full SID compliance for a 441 has historically run $120K–250K; Aircraft Bluebook ascribes a ~$112K valuation haircut to non-SID-compliant 441s. See maintenance-ecosystem.
• TPE331 hot section inspections (441): Every ~1,800 hours, ~$80–120K per side.
• PT6A-112 HSI (425): Every ~1,800 hours, ~$40–60K per side.
• Fuel bladder leaks: Both models have bladder-style main tanks; replacement is ~$25K+ per wing.
• Pressurization outflow valves and controllers: Aging units are a recurring squawk on both models.
• Corrosion in the 441 wing: Particular concern on airframes kept coastally; heavily checked during SIDs.
• Nose gear drag brace (441): Historical service bulletin for cracking.

Pre-buy must include a full SID status review, wing spar AD compliance records, engine trend monitoring data, and a corrosion survey.

• Hull values: $600K–$1.9M drive hull premiums of roughly 0.5–0.9% of hull value annually.
• Typical annual premium: $6,800–$9,600 for a qualified, current turboprop pilot with $1M smooth liability and $1M+ hull. Transitioning pilots pay more until 200+ hours in type.
• Training requirement: Initial SimCom or FlightSafety type-specific school (~$10–15K) is effectively required by underwriters. Annual recurrent is typically mandated.
• Minimum experience: Underwriters generally want 1,000+ TT, 250+ multi, 100+ turbine, and a current instrument rating. Single-pilot approval in the 441 usually requires ATP or significant turbine PIC time.
• See insurance-underwriting for full turboprop twin category details.