1978 Cessna 421C Golden Eagle — Garmin G600, GFC 600 Autopilot, GWX 75 Radar, RAM Right Engine 231 SMOH — $549,000
Most 421Cs for sale have the same story: mid-time engines, a legacy autopilot, and a 530/430 stack that was modern in 2005. N21SS is not that airplane. The panel was rebuilt around a Garmin G600 primary flight display, a Garmin GFC 600 digital autopilot installed in January 2024, and a Garmin GWX 75 color weather radar — also installed January 2024. This is the avionics package that makes single-pilot IFR in a pressurized twin genuinely manageable: a glass primary display, a modern digital autopilot with envelope protection, and onboard radar that does not require a second pilot to interpret. The GTX345R handles ADS-B In and Out. An L3 ESI-500 electric standby covers the panel if the G600 ever needs attention. A JPI EDM760-6C monitors all six cylinders on both engines simultaneously.
The mechanical story is equally strong. The right engine — Continental GTSIO-520-L, S/N 246026R — was overhauled by RAM Aircraft in Waco, Texas to New Parts Limits in May 2020, with a new CMI heavy-style crankcase, new CMI nickel cylinders, new RAM camshaft, and new lifters. It has approximately 231 hours since that overhaul. The left engine, S/N 239244-4, shows approximately 1,098 hours since major overhaul, with recent top-end work including an overhauled #3 cylinder completed in March 2024 using new Continental parts. Both Hartzell HC-C3YN-2UF three-blade propellers were installed new in February 2004 and have approximately 1,553 hours since new — well inside Hartzell's 2,400-hour TBO.
The maintenance posture is what serious 421C buyers want to see before they pick up the phone. The most recent annual inspection was completed August 7, 2025 by Midwest Corporate Air in Bellefontaine, Ohio (Tim Kerns, A&P/IA). New Goodyear tires were installed on all three positions, a new Concorde RG24-20 main battery was installed, and new RAM exhaust risers with all-new gaskets and hardware were fitted to the left engine. IFR certification was completed March 21, 2026 by Achievement Aviation of Ohio, confirming the G600, GTX345R, and L3 ESI-500 to 35,000 feet. The landing gear system underwent a complete overhaul in November 2022. The A/C compressor was overhauled in May 2024. The left hydraulic pump was overhauled in December 2025. Whelen Orion 650 LED position and strobe lights were installed in September 2025. The oxygen system is current with hydrostatic testing due March 2029.
Complete and continuous logbooks are included — airframe, both engines, and both propellers — with no known major damage history. The cabin is configured in an executive club arrangement with a center table. Air conditioning, oxygen, and Shadin fuel flow are all installed and operational. This is a pressurized, IFR-equipped, glass-panel 421C with a fresh right engine and a modern autopilot. Serious inquiries only. Logbooks and maintenance records available for review prior to inspection.
Airframe
Total Time
5,231
Airframe
No Known Damage History
Complete Continous Logs
Engine 1
Engine 1 Make/Model
CONTINENTAL IO520L
Engine 1 Serial Number
239244-4
Engine 1 Time
1,098 SMOH
Engine 1 TBO
1600
Engine 2
Engine 2 Make/Model
CONTINENTAL IO520L
Engine 2 Serial Number
246026R
Engine 2 Time
231 SMOH
Engine 2 TBO
1600
Engine 2 Notes
RAM New Parts Limits OVH 5/2020
Props
Prop 1 Manufacturer
HARTZELL
Prop 1 Model
HC-C3YN-2LUF
Prop 1 Time
1553 SNEW
Prop 2 Manufacturer
HARTZELL
Prop 2 Model
HC-C3YN-2LUF
Prop 2 Time
1552 SNEW
Prop Specs
Both New (Installed 2/2004)
Avionics
ADS-B Equipped
Yes
Avionics/Radios
Garmin G600 | S/N 3M5002075
Garmin GFC 600 Digital | Installed January 2024 | STC SA01844WI
Garmin GWX 75 Color | Installed January 2024
Garmin GTX345R | ADS-B In/Out | S/N 3EH023797
L3 ESI-500 Electric Standby | S/N 2412
JPI EDM760-6C | S/N 6610 | STC SA00729SE
Whelen Orion 650 LED Position/Strobe | Installed September 2025
Additional Equipment
Oxygen System
Yes
Air Conditioning
Yes
Additional Equipment
Air Conditioning: Installed | Compressor overhauled May 2024
Oxygen: Installed | Hydrostatic due March 2029
Fuel Flow: Shadin Fuel Flow System
Inspection Status
Inspection Status
Complete Gear Overhaul- Nov. 2022
Complete Annual- Aug 2025
This monthly repayment estimate is provided by Overdrive Commercial Funding Pty Ltd (Australian Credit License: 389328) This estimate is based on a Chattel Mortgage, which is only available where the purchaser of the item intends to use the item for primarily commercial use. The term of this loan is based 60 months with 30% residual & subject to qualifying commercial assets and credit criteria. Fees and charges are not included in this estimate and may apply. If the item is a vehicle and is not listed with a drive away price, any repayment estimate does not include additional costs, such as stamp duty and other government charges. The term of this loan is 60 months. This estimate should be used for information purposes only and is not an offer of finance on particular terms. This repayment estimate is the estimated lowest repayment available from Overdrive Commercial Funding Pty Ltd’s panel of lenders and products for this specific item each day, and includes several assumptions about the item, purchaser, and loan specifics. All loans are subject to eligibility criteria and Overdrive Commercial Funding Pty Ltd loan approval process. A specific quote including details of all fees and charges, or loans for items with primarily or wholly personal use can be obtained via overdrivefunding.com.au or by calling 1800 954 124.
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