In 1980, the baggage door on the Cessna 172 was redesigned once again to incorporate flush, circular buttons that pop out when pressed, revealing a handle which can be used to open the door. In addition, the lower rear corner of the windshield was rounded. (This drawing depicts 1980 172N ~ 1981 172P, S/N 17272885 ~ 17275034)
Own work
Er-Jin Jang