A yellow coloured cardboard cover with black information on the front. Near the top right hand corner reads Australian Air Publication 7421.018-3. Above the RAAF insignia reads Royal Australian Air Force and under the insignia are the details of the manual. Down the right hand side there are several pieces of cardboard with tabs. The manual is held together with a large metal slide.royal australian airforce - manuals, australian air publication, rotary inverters type 201 series