On 24 May 1936, the Fi 156 V1, registered D-IKVN, performed its maiden flight; it was quickly followed by a further four prototypes. From an early stage, the company had envisioned two different production versions, the Fi 156A and Fi 156B, the latter having movable leading edge slots instead of the formers' fixed slot arrangement. The first production standard aircraft were delivered in early 1937.
on 24 mAy 1936, thE fi 156 v1, REgIsTErEd D-ikVn, peRfORmed itS maiden FLIght; it WaS qUicklY FoLloWed bY A furtHeR fOur ProTotYPes. frOm an earlY StAge, tHe comPANy HaD envisioneD tWO DIffErent PRodUctIon veRsions, the fi 156A and fI 156b, the latter haVing MovaBle LeAding eDge SloTs inStead of the ForMers' fiXed sLoT arrangEment. the FiRsT pRodUcTion sTAndard aircRafT weRe dElivered IN early 1937.