Plain English Meaning

The outer parts of the airplane that are meant to give way in a crash. By breaking apart, they soak up the force of the impact so less of it reaches the people inside.

Full Definition

Parts of an airplane — such as the wings, engine mounts, landing gear, and outer fuselage skin — designed to absorb and dissipate impact energy by crushing, bending, or breaking away during a crash, so that the energy reaching the cabin and its occupants is reduced.

Context Anchor

Seen in basic safety and emergency landing discussions, especially when thinking about how the airplane can absorb damage while protecting the cabin area.

Derivation

‘Dispensable’ comes from Latin dispensare, meaning ‘to do without’ or ‘to give up.’ In this context, these are parts the airplane can afford to lose in a crash because their sacrifice protects the cabin.