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1974 Beechcraft C23 Sundowner 180Single-Engine Piston Aircraft • Longmont, CO, USA

This 1974 Beechcraft C23 Sundowner 180, registration N6508R, presents a well-maintained and extensively upgraded example with 2,174 total time on the airframe. The aircraft is powered by a Lycoming O-360-A4J engine with 201 hours since its major overhaul, which included new Millennium cylinders, and it features a Sensenich fixed-pitch propeller with 81 hours since installation. A significant investment of nearly $40,000 has been made in a complete Garmin glass panel upgrade, including a GNX 375 GPS/ADS-B transponder, a GMA 345 audio panel, a GNC 215 NAV/COM, a GTR 205 COM, three GI 275 displays with Engine Information System, and all-new...

Year
1974
Make
Beechcraft
Series
Sundowner
Model
C23 Sundowner 180
Tail #
N6508R
Serial #
M-1583

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Specifications

Category
Single-Engine Piston
Intended Use
Training, Recreational
Flight Rules
IFR
Useful Load
950 lbs
Seats
4

Hours, Logs & Inspections

Total Time
2,174 hrs
Engine 1 Time
201 hrs (SMOH)
Prop 1 Time
81 hrs

Avionics

GPS

Garmin GNX 375 - GNX GPS/ADS-B Transponder, GA GPS/WAAS Antenna

Comms

Garmin GNC 215 - GNC NAV/COM Radio, GTR COM Radio

Autopilot

Century I - I Autopilot with GPS Tracking

Audio

Garmin GMA 345 - GMA Audio Panel with Bluetooth

ADS-B Out

Garmin GNX 375 - GNX GPS/ADS-B Transponder

ADS-B In

Garmin GNX 375 - GNX GPS/ADS-B Transponder

PFD

Garmin GI 275 - (3) GI Includes EIS, ADAHRS, and Backup Attitude

EMS/EIS

Garmin GI 275 - GI EIS with GEA Engine Sensor Kit

Additional Equipment

Fuel System

CIES - Fuel System Upgrade with CIES Digital Senders

Electrical System

Garmin GSB 15 - GSB USB Power Module, Panel Reconfiguration, New CB Bus Bars, and Wiring Harnesses, Vacuum System Removed, Electrical-Only Ops

Sensors

Garmin GAE 12 - GAE Digital Altitude Encoder, GMU Magnetometer, GTP OAT Probe

Engine

New Millennium - Cylinders, Lightweight Starter, Overhauled Magnetos, Yellow-Tagged Crankcase/Steel Parts

Interior & Exterior

Interior Rating
9/10
Interior Year
2005
Paint Rating
9/10
Paint Year
2005
Interior Notes
Tan Leather Seats with Sheepskin Trim, Beige Carpet, Ultra Leather Headliner, Wood Accents, and New Trim Panels
Exterior Notes
5-Color Imron Paint Scheme: Beige Base with Burgundy, Aqua, and Gold Striping

Engine & Propeller

Engine Type
Piston
Engine Count
1
Engine Make
Lycoming
Engine Model
O-360-A4J
Engine Power
180 HP
Propeller Model
Sensenich fixed-pitch

Asking Price

$129,900

Aircraft Location

Longmont, CO, USA

Listing Details

Used
For Sale

Price History

Dec 22, 2025: $129,900 - trade-a-plane

Contact Seller

First Seen: Dec 22, 2025

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1974 Beechcraft C23 Sundowner 180

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1972 Beechcraft C23 Sundowner 180

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1978 Beechcraft C23 Sundowner 180

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1979 Beechcraft C23 Sundowner 180

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Useful Load
Unspecified
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Asking Price

$129,900