SE01791LA
Conversion of the subject engines to incorporate modification of crankcase, replacing crankshaft assembly, main bearings, rod assembly, piston, fuel system, and fuel system adjustment. Held by Colorado Air Parts. Last revised August 21, 2015. System: engine.
What it applies to
What an approved modification is
A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.
Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 20, 2026.