PIPER GERONIMO

Piper Geronimo for Sale — The Apache Reborn as a Speed Machine

The Piper Geronimo is one of aviation's most successful conversion programs — a comprehensive transformation of the Piper PA-23 Apache that takes a practical but pedestrian light twin and turns it into a genuinely capable high-performance aircraft through engine upgrades, airframe refinements, and systems improvements that Seguin Aviation Company pioneered in the 1960s. The Geronimo conversion replaced the Apache's original Lycoming O-320 or O-360 engines with fuel-injected Lycoming IO-360 engines of 180 horsepower each, added wingtip fuel tanks that dramatically extended range, and incorporated numerous aerodynamic refinements that transformed the aircraft's performance profile. The result is an aircraft that uses the Apache's proven structure and handling characteristics as a foundation for genuinely competitive performance.

What the Geronimo Conversion Delivers

The performance improvements from the Geronimo conversion are substantial rather than cosmetic. Maximum cruise speed increases from the Apache's approximately 155 knots to approximately 175 knots — a 13% improvement that meaningfully compresses travel times on longer sectors. The fuel-injected IO-360 engines provide more consistent power delivery across altitude and temperature ranges than the carbureted originals, reducing the management workload in instrument conditions. The wingtip tanks extend fuel capacity to levels that enable serious cross-country planning without the fuel stop interruptions that limited the original Apache's utility.

Buying a Geronimo-Converted Apache

When evaluating a Geronimo conversion, verify the conversion documentation carefully — the Supplemental Type Certificate (STC) paperwork should accompany the aircraft and confirm that the conversion was performed by an authorized facility to the approved data. Inspect the wingtip tank installations for corrosion and security, as these are critical structural additions. The IO-360 engines, while excellent powerplants, have their own TBO requirements that differ from the original Apache engines. A pre-purchase inspection by an A&P mechanic familiar with both the PA-23 airframe and the Geronimo STC is essential.

Browse Geronimo Listings on Airplane Trade

Find Piper Geronimo converted Apache aircraft for sale on Airplane Trade from verified sellers worldwide. Complete STC documentation, wingtip tank installations, and IO-360 engine records available with each listing. Connect with sellers who understand this unique conversion's history and requirements.