Equipped an Armstrong Siddeley Genet Major engine. Reportedly transferred to the French Air Force and possibly even used at the flying school at Evreux and later Moissac. Location might be Schiphol, but that remains unconfirmed. The Fokker S.IX was developed in the mid-1930's as a military trainer, following a request by the Dutch Navy for a replacement aircraft for the Fokker III. Its first flight was on 1 November 1937 and about 50 frames were bult. The Dutch Navy initially ordered 27 aircraft but later reduced this number to 15. The Air Force ordered 20 aircraft, but with a different engine (the Genet Major engine). A later order for 20 more aircraft was canceled when Germany invaded the Netherlands in 1940. Photo from W. Muntinga