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Airframes Alaska purchased Performance STOL, designer of the double-slotted 'Keller' flap system for PA-18s and experimental Cub-type bush planes. The FAA has transferred the STC to Airframes Alaska, and production is expected to start in late August 2017.
“We’re on track to put Performance STOL flaps into production in late August.”generalaviationnews.com
Summarized from public sources; check the original articles before acting on it.