Forerunner of the MS.733 Alcyon trainer, a three-seater with fixed landing gear first flown on 11 August 1949. Its Mathis engine was quickly replaced by a German Argus As 10 engine, producing the MS.731. In 1951 two new MS.732 prototypes got retractable gear, and finally the MS.733 introduced the Potez 6D engine.
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