The main tanks and external fuel tanks are usually built in the form of saddles on the pressure hull, or as a light outer skin circumscribing the pressure hull .
Amatanki angundoqo kunye namatanki angaphandle esibasi adla ngokwakhiwa ngendlela ethile oku kwesali kwisiqu senqanawa esikuxinzelelo, okanye njengolusu lwangaphandle olucekeceke olubangela uxinzelelo kwisiqu senqanawa.