This 1978 Mooney M20K 231 Is a Fast, Capable, Cross-Country ‘AircraftForSale’ Top Pick

High-performance single combines classic efficiency with a desirable suite of modern Garmin avionics.

FLYING Staff

Thursday, August 14, 2025 at 11:40 AM ET

Verified

Edited By:

Travis Tingle

1978 Mooney M20K 231 [Courtesy: David Miller]

Key Takeaways:

The article highlights a 1978 Mooney M20K 231 as "Today's Top Pick," valued for its speed, sleek design, and impressive performance.
It features a turbocharged Continental TSIO-360-LB engine with low hours since overhaul, a new propeller, and performance-enhancing modifications like an automatic wastegate and GAMI injectors.
The cockpit is IFR-ready with a modern Garmin avionics suite, including a G500 multifunction display, GTN 750, GNS 430W, and an engine monitor.
Listed at $139,900, the aircraft is described as a well-maintained, technologically updated, high-performance cross-country machine with a custom paint job and leather interior.

See a mistake? Contact us.

Every day, the team at Aircraft For Sale chooses an airplane that catches our attention because it is unique, a good deal, or has other qualities we find interesting. You can read Aircraft For Sale: Today’s Top Pick at FLYINGMag.com daily.

Today’s Top Pick is a 1978 Mooney M20K 231.

For those with a need for speed, this 1979 Mooney M20K 231 stands out from the crowd. Known for its sleek design and impressive performance, the aircraft is a compelling choice for pilots who want to get to their destination quickly and efficiently, whether for business or pleasure.

Powering the aircraft is a turbocharged Continental TSIO-360-LB engine with only 662 hours since a major overhaul. That power is transferred to a three-bladed MT propeller with a mere 120 hours of use. Performance is further enhanced by a suite of valuable modifications, including a Merlyn automatic wastegate, GAMI fuel injectors, and intercooler, all working together to maximize speed and fuel efficiency.

1978 Mooney M20K 231 [Courtesy: David Miller]

The cockpit is ready for serious IFR flying, featuring a modern, well-equipped panel. A Garmin G500 multifunction display anchors the avionics suite, complemented by a Garmin GTN 750 and GNS 430W for GPS navigation. In-flight weather information is provided by a Garmin GDL 69 XM Weather datalink, while a Garmin GTX 330 transponder handles ADS-B Out requirements.

For a comprehensive overview of engine health, an Electronics International MVP-50P engine monitor is also installed.

While the airframe has accumulated 5,155 hours, the aircraft has clearly been well maintained. A custom paint job gives it a sharp ramp presence, and the leather interior ensures a comfortable journey for the pilot and passengers.

Listed at $139,900, this 197 Mooney M20K 231 represents an excellent opportunity to acquire a technologically updated, high-performance aircraft. Interested buyers will find a capable and efficient cross-country machine ready for its next adventure.

If you’re considering making this Mooney your own, the team at FLYING Finance can assist with financing options. You can use their airplane loan calculator to estimate monthly payments or connect with an aviation finance specialist at flyingfinance.com.