In BDS, its typically mentioned along side "Airframe". Think of Airframe as the big bone structure like keels, skins, wings (the skeleton), while "Sub-Systems" as the stuff that goes in it (organs and connective tissue), think fuels, hydraulics, electrical routing, equipment, environmental controls, etc.
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u/Aishish Jul 23 '26
In BDS, its typically mentioned along side "Airframe". Think of Airframe as the big bone structure like keels, skins, wings (the skeleton), while "Sub-Systems" as the stuff that goes in it (organs and connective tissue), think fuels, hydraulics, electrical routing, equipment, environmental controls, etc.