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Mooney Flyers, I seek consensus and feedback from Mooney operators regarding the new FAA rule change (MOSAIC) that allows Sport Pilots to fly four-seat complex aircraft, provided the aircraft’s clean stall speed is 59 KCAS or less. Are Sport Pilots allowed to fly the M20 with the MOSAIC final rule? Using the TCDS, Owners Manuals/Pilot Operating Handbooks (POH), FAA definitions, and the final rule as a reference, it looks like the answer is not no. The answer is more like, “It depends!” Because we are dealing with a stall speed limitation (VS) and VS is measured using Calibrated Air Speed (CAS), we must determine how to adjust the indicated speeds published in most Owners Manuals (vintage Mooneys) and POH (later Mooneys). The aerodynamic design factors that impact the stall characteristics of the M-20 have not changed substantially from the original type certificate. Structural enhancements over time have increased the load factors that newer aircraft can be exposed to, resulting in increased speed and gross weight limits. Aircraft maximum takeoff gross weight (MTGW) directly impacts the published clean stall speed (VS1). Therefore, VS1 for the Mooney M20 is a function of MTGW, and the highest published MTGW, which equates to a VS1 of 59 KCAS, is 2740 LBS. So, my position is that a Sport Pilot would be entitled to operate an M20J or earlier with a published MTGW of 2740 or less. The data to support this idea is published in the 1977 Mooney M20J POH Figure 2-2. Published airspeed indicator marking ranges in Figure 2-2 are in CAS MPH. Specifically, the green arc range is 68 - 200 CAS MPH. When 68 MPH CAS is converted to KCAS, the result is 59 KCAS, the limit that Sport Pilots can operate. Why is this important? Sport Pilots only need a valid driver's license to meet the medical requirements to fly; the lack of a flight physical is no longer a limitation to being legal to fly an older Mooney and many other certificated aircraft. Is my position correct? - Cheers