1973 Cessna 421B
Multi Engine Piston
Aircraft Details
Seller reportedAvionics & Equipment
IFRDescription
Attractive, well equipped, well maintained 421B with Garmin G600 TXi, GNS 530W, GI 275, GNC 255A, GTX 345 ADS-B In/Out, GTX 330ES, GMA 345 Bluetooth audio, S-Tec 3100 autopilot w/flight director and FIKI option, JPI EDM 790 color engine analyzer.
Engine
Left Engine: • Teledyne Continental Motors GTSIO-520-C-C-H, 375 HP, msn: 155564-R • 540 hours SFRM; 1,600-hour TBO • Factory remanufactured by TCM 02/05/1997 • 34 hours since conversion to GTSIO-520-C-C-H • Engine converted by Certified Engines Unlimited 12/22/2024 • Overhauled magnetos (09/18/2024) installed 12/22/2024 @ 506.2 SFRM • Turbocharger & wastegate overhauled by Main Turbo Systems 03/01/2025
Propeller
Left Propeller: • McCauley 3AF37C516/G90LFB-0 electrothermal deice, sn: 001149 • 827 hours SPOH; 2,000-hour TBO • Propeller overhauled by Air Prop Specialists 11/14/2013 • 34 hours since prop & governor flush by Precision Prop. Service 02/12/2025 Right Propeller: • McCauley 3AF37C516/G90LFB-0 electrothermal deice, sn: 001156 • 827 hours SPOH; 2,000-hour TBO • Propeller overhauled by Mid Florida Aircraft Propeller 01/10/2015 • 34 hours since prop & governor flush by Precision Prop. Service 02/12/2025
Interior
Interior: • Interior refurbished in 2015 • Cabin entryway light • Beige leather headliner • Beige leather window trim • Beige and dark beige leather side panels • Fully articulating pilot and copilot beige leather seats with sheepskin inserts, stowable center armrests, shoulder harnesses and lap belts • Four place club beige leather seats with headrests, stowable center armrests and lap belts • Aft cabin beige leather belted lav seat • Right and left side cabin stowable dark wood executive writing tables with dual cup holders • Dark beige tweed floor carpeting with tweed carpeting runners • Cockpit overhead air conditioning vents • Overhead speaker • Cabin overhead individual air conditioning vents and spot lights • Aft cabin cargo/baggage area • Condition 7 (Professional Aircraft Appraisers Organization Interior Grading Guide)
Exterior
Exterior: • Aircraft refinished in 2015 • Overall white with gray, black and silver trim and accents • Engine nacelle lockers • Condition 6 (Professional Aircraft Appraisal Organization Exterior Paint Grading Guide)
Inspection
Inspection: • Annual inspection due by 04/01/2026 • IFR recertification due by 06/30/2027 • ELT battery replacement next due by 02/28/2026 • Oxygen cylinder hydrostatic test due 11/30/2026 Logbooks: • All original and complete airframe and engine logbooks • Propeller logbooks start with overhauls at 10/12/2008 Repairs: • 10/30/2018 prop strike existing engines repaired @ 506.2 SFRM • 10/13/1988 prop strike repairs (non-structural, old engines not on airframe) • 11/01/1986 airframe, engine and prop repairs made by Beegles Aircraft Svc. (see airframe logbook this date) • 01/17/1984 airframe, engine and prop repairs made by Beegles Aircraft Svc. (see airframe logbook this date)
Modifications / STCs
• Additional Features:
• • Overhauled right evaporator blower motor installed 06/25/2024
• • New Concord RG24-20 battery installed 05/29/2024
• • Cessna Auxiliary Kit AK414-34 rudder gust lock installed 05/07/2024
• • SMR Technologies Ice Shield deice boots installed on left and right inboard wings, left and right horizontal stabilizers 05/07/2024 per STC SA02003NY
• • Overhauled left engine outboard exhaust assembly installed 05/07/2024
• • Pressurization system door seals and ducts replaced, dump, outflow and safety valves serviced 07/14/2023
• • Windshield heat DC heat module replaced 06/22/2023
• • Micro Aerodynamics wing and rudder vortex generators and left and right engine strakes installed 03/16/2023 per STC SA00514SE
• • BNC Aerospace door snubber installed 03/16/2023 per STC SA2440SW
• • Pilot storm window replaced 03/16/2023
• • Right engine overhauled Hartzell starter installed 09/08/2022
• • Whelen LED landing, taxi lights installed 07/07/2022
• • Whelen LED wingtip, lower fuselage, tail cone and top rudder strobe, nav and anti-collision lights installed 04/22/2022
• • Lee Aerospace refurbished cabin windows and installed new right windshield, right cockpit side window, and storm windows 12/17/2021
• • Left and right brake discs, pads and shims replaced with new 03/30/2021
• • Cessna Service Kit SK414-BE wing rib modification main landing gear side brace installed on left and right wings 02/25/1998
• • Cessna Service Kit SK421-119B1 and -119B2 glass D.C. windshield installed 03/17/1989
• • Brackett air filter assemblies installed 06/03/1987 per STC SA71GL
• • J. B. Systems freon air conditioning system installed 10/12/1973 per STC A7CE
• • FIKI equipped
• • Heated pilot windshield
• • Surface deicing boots (condition 7 out of 10) and hot props
• • Spacious nose baggage compartment left and right side accessible
• • Aileron, rudder and elevator trim
• • Alternate static air source
• • Right side cabin side emergency exit window
• • Heated pitot static head
• • Pilot and copilot cockpit storm window
• • External ground power receptacle
• • Parking brake
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 |
|---|---|---|---|---|---|---|
|
Wolfe Aviation
trade-a-plane.com
|
$349,500
|
Caldwell, ID | Mar 30, 2026 | — | Active | |
|
Wolfe Aviation
controller.com
|
$349,500
|
Stockton, CA | Mar 25, 2026 | — | Active | |
|
Charles Riley
controlleremea.co.uk
|
$330,841 *
GBP £245,709
|
Littleton, CO | Apr 04, 2026 | — | Active | |
|
Wolfe Aviation
aviationtrader.com.au
|
$360,377
|
Stockton, California, Australia | Apr 04, 2026 | — | Active | |
|
Wolfe Aviation
controlleremea.co.uk
|
$355,780 *
GBP £264,231
|
Stockton, CA | Apr 04, 2026 | — | Active |
* Converted to USD at daily European Central Bank (ECB) exchange rates
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AeroGurus Data & Analysis
Independent data from FAA, NTSB, and market analysis
About This Cessna 421B
This 1973 Cessna 421B (N477MG) is a 8-seat multi engine piston with 8,901 hours on the airframe. There are currently 15 421B aircraft listed for sale with asking prices ranging from $129,500 to $375,000. This aircraft is priced above the market average at $349,500.
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 8,901 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 N477MG.
Location & Ownership
Title 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 N477MG 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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