1973 Cessna 421B
Multi Engine Piston
Aircraft Details
Seller reportedAvionics & Equipment
BTHThe aircraft is equipped with a well-integrated avionics suite designed to support both capability and situational awareness. Garmin GTN 750 and GTN 650 WAAS-enabled GPS/NAV/COMs anchor the panel
complemented by Garmin GI-275 electronic flight instruments for a modernized interface. Full ADS-B In and Out compliance provides real-time traffic and weather data along with seamless access to controlled airspace. Additional systems include a Garmin GMA-35 remote audio panel
Garmin GDL-69 XM satellite weatherand a JPI EDM-760 engine monitor. Shadin systems support altitude alerting and fuel flow management
while safety and redundancy are enhanced by an Artex ME 406 ELT full copilot instrumentation and a RAM engine indicator system.Description
Exclusively represented by Marshland Aviation, known for disciplined processes and straight execution, this 1973 Cessna 421B is now available for acquisition. This aircraft is equipped with a well-rounded avionics and systems package that supports both capability and confidence in flight. Garmin GTN 650 and 750 NAV/COMs anchor the panel, complemented by a three-tube Aspen EFD-1000 C3 Pro for a modernized flight deck. An S-TEC 3100 autopilot with yaw damper enhances stability and workload reduction, while dual Garmin transponders, including a GTX-345, provide full ADS-B In and Out compliance. Situational awareness is further supported by an L3 WX-10A Stormscope and Skywatch 497 TCAS system. Powered by GTSIO-520-H engines and monitored through a JPI EDM-760, the aircraft is configured with practical upgrades including dual wing locker fuel tanks, vortex generators with a corrected airspeed indicator and gross weight increase, and an onboard engine fire detection and extinguishing system. Finished in Matterhorn White with Ocean Blue and Sapphire Blue accents, the exterior presents cleanly and with presence.
Engine
Powered by RAM-overhauled Continental GTSIO-520-H engines, known for delivering reliable turbocharged performance with improved durability over standard factory specifications. Engine operation is supported by a JPI EDM-760 engine monitoring system for precise management throughout all phases of flight. The aircraft is further equipped with an engine fire detection and extinguishing system, adding an additional layer of operational safety.
Interior
Finished in black leather seating with matching wood grain tables, the cabin offers a classic executive aesthetic. The combination of dark upholstery and warm wood accents creates a refined yet functional space, suitable for both business travel and personal use. The interior presents cleanly and maintains a timeless look that doesn't feel dated.
Description and equipment details provided by the seller. AeroGurus does not verify seller-provided information.
Price Comparison 1 active offer
| Source | Price | Location | Listed | Days on Market | Status | Action |
|---|---|---|---|---|---|---|
|
Marshland Aviation
trade-a-plane.com
|
Contact for Price
|
CO USA | Apr 15, 2026 | — | Active |
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AeroGurus Data & Analysis
Independent data from FAA, NTSB, and market analysis
About This Cessna 421B
This 1973 Cessna 421B (N239SE) is a 8-seat multi engine piston with 7,500 hours on the airframe. There are currently 15 421B aircraft listed for sale with asking prices ranging from $129,500 to $375,000.
The 421B cruises at 230 kts (426 km/h) with a range of 1,385 nm (2,565 km) — suitable for regional and medium-distance travel.
Operating costs: Fuel burn is 34 GPH (129 L/h), which at current Jet-A prices (~$5.50/gal) means approximately $187/hr in fuel alone. Total variable cost including maintenance reserves is approximately $420/hr. Annual fixed costs (hangar, insurance, crew, annual inspection) average $42,000. With 7,500 hours on the airframe, this aircraft has exceeded TBO (1,600 hrs) — verify engine status and overhaul reserve.
NTSB records show 0 incidents for this airframe — a clean safety record. There are 1 airworthiness directive applicable to this aircraft type — review AD compliance carefully before purchase. Mechanics have filed 10 service difficulty reports for this type — common maintenance items to discuss during pre-buy.
Pre-Purchase Checklist
Cessna 421B — Model Specs
Model specificationStandard specs for this model. Actual aircraft may differ.
Estimated Cost of Ownership
AeroGurus estimateCESSNA 421B
AeroGurus estimates based on industry averages for the CESSNA 421B. Actual costs vary by location, usage, maintenance history, and configuration. Not a financial quote.
Ownership & Registration
FAA registration data pending for N239SE.
Location & Ownership
Aircraft Location
CO USA
Seller reportedTitle Status
No FAA title records
Available for US-registered aircraft only
Source: FAA Aircraft Registry, FAA Civil Aviation Registry (DocIndex). Title data may be delayed. Always verify with an aviation attorney before purchase.
Safety Record
NTSB safety data coming soon.
We'll check N239SE against the NTSB accident database.
Airworthiness Directives — Cessna 421B
ADs are mandatory safety instructions issued by the FAA. 1 recent AD found for this aircraft type.
The Cessna Aircraft Company Models 401, 401A, 401B, 402, 402A, 402B, 402C, 404, 411, 411A, 414, 414A, 421, 421A, 421B, 421C, 425, and 441 Airplanes
View full AD →Source: FAA Airworthiness Directives database. Showing most recent ADs for this aircraft type.
Service Difficulty Reports — Cessna 421B
SDRs are reports filed by mechanics about problems found during maintenance. 10 recent reports for this aircraft type.
LOSS OF 5 INCHES OF MP AT FL 240 AND INFLIGHT INVESTIGATION SHOWED A ROUGH RUNNING RH MAGNETO. DISCOVERY OF A DEFECTIVE SPARK PLUG LEAD (SEE OTHER SDR) ON A 25 HR TTSN CHAMPION SPARK PLUG HARNESS LED WITH 25 HRS TTSN SPARK CHAMPION RHB32E SPARK PLU...
CRUISE FLIGHT FL 240, 25 HRS SINCE NEW CHAMPION IGNITION HARNESS, BLUE LABEL TCM/CAT BENDIX S6LN-1205 MAGNETO, AND CHAMPION RHB32E SPARK PLUGS AT ENGINE OVERHAUL (25 HRS TTSMOH OF ENGINE). IN CRUISE FLIGHT LOST 5 INCHES OF MP PRESSURE ON NEWLY OVER...
A CRACK ON THE SKIN AT THE RIGHT WING REAR SPAR AND TRAILING EDGE. THE LOCATION IS AT THE MAIN FUEL TANK REAR SPAR ATTACH POINT. THE CRACK IS CAUSED BY VIBRATION OR LOOSE REAR MAIN FUEL TANK ATTACH BOLT. RECOMMENDED AT EACH ANNUAL INSPECTION, INSP...
PERFORMED REPAIR WORK ON THE AIRCRAFT FOR LOW CABIN DIFFERENTIAL/PRESSURIZATION. FOUND MANY LEAKS AND REPAIRED. DIFFERENTIAL WAS REPAIRED TO BOOK VALUES. CUSTOMER TOOK POSSESSION OF THE AIRCRAFT AND AFTER SEVERAL FLIGHT HOURS HEARD A POP AND LOST SOM...
(CAN) AIRCRAFT SUFFERED AN UNCOMMANDED RIGHT ENGINE SHUT DOWN APPROXIMATELY 10 MINUTES INTO THE FLIGHT, PILOT EXECUTED AND ENGINE OUT SHUT DOWN AND FEATHERED THE PROPELLER, THEN DIVERTED. ON OPENING THE RIGHT ENGINE COWLS THE FOLLOWING WAS FOUND: TH...
HAD ONE ROUGH MAG CHECK AND 2 GOOD MAG CHECKS PRIOR TO FLIGHT. REDUCED POWER IN CLIMB AND MAG CHECK REVEALED NO SPARK ON LT MAGNETO. RETURNED TO AIRPORT. REMOVED IGNITION HARNESS FROM MAG AND NOTICED LOTS OF METAL FLAKES UNDER THE COVER OF THE MAG...
FOUND PILOTS SEAT LT PIVOT ARM BROKEN. REPLACED PIVOT ARM IAW SERVICE MANUAL (REV 15) SECTION 3.
WHEN OIL FILTER WAS SECTIONED FOR CHECK FOR CONTAMINATION, LARGE CHIPS OF ALUMINUM WERE NOTED. SENT OIL FILTER TO AVIATION OIL ANALYSIS LABS AND CONTACTED ENGINE MFG FOR GUIDANCE. REMOVED AND INSPECTED OIL PUMP, NO DEFECTS FOUND. REMOVED VALVE TRA...
WHILE REPAIRING RUDDER DUE TO WIND DAMAGE, FOUND RUDDER TORQUE TUBE, PN 5133011-9 TO BE BADLY CORRODED. REPLACED WITH NEW.
RPM AND MANIFOLD PRESSURE STARTED FLUCTUATING FOR THE RT ENGINE. WHITE SMOKE FROM TURBO CHARGER VENTS WAS NOTED AS WELL AS OIL STREAKS NOTED. OIL PRESSURE DROPPED TO BOTTOM OF GREEN ARC ON THE OIL PRESSURE GAGE. EMERGENCY PROCEDURE CHECKLIST CALLE...
Source: FAA Service Difficulty Reporting System. Shows maintenance issues reported by mechanics for this aircraft type.
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