The Dornier Do-28 was presented in 1959 and was a more powerful development of the previous Do-27 model. It was decided to install two engines and expand the fuselage to accommodate up to 6 passengers. The aircraft had excellent STOL capabilities that allowed them to operate on unprepared and difficult access runways, a capacity very appreciated in African countries in particular. The first version or A-1 was a sales success and 60 examples were built, six of which were purchased by the Spanish Air Force that used them until 1980 in general utility and liaison missions. Almost 30 countries have used the Do-28 in its different versions, some for civil transport and even some aircrafts had been equipped for SIGINT gathering information missions.
DO-28A1 gallery and more info