Definition
The capacity of an aircraft's structure, restraints, seats, and interior design to protect occupants from injury during an impact by absorbing and dissipating crash forces, maintaining a survivable space around occupants, and reducing the risk of post-crash fire.
Plain English
How well an airplane is built to keep the people inside alive and uninjured if it crashes.
Context Anchor
Seen in discussions of aircraft design, seat belts and shoulder harnesses, emergency landings, and survivable accidents.
Derivation
A combination of 'crash' and 'worthiness' (meaning 'fitness' or 'suitability for'). The same pattern as 'seaworthiness' (fit to handle the sea) or 'airworthiness' (fit to fly). So 'crashworthiness' literally means 'fit to handle a crash' -- built to perform well in one.
Why Pilots Care
It influences survival rates in accidents through choices in seat design, fuselage strength, and restraint systems.
Analogy
It is similar to how a car’s seat belts and protective body structure do not prevent every accident, but they can greatly reduce injury when an accident happens.
Intuition Check
Crashworthiness does not mean an airplane is unlikely to crash. It means the airplane is designed to help protect the people inside if a crash or hard impact occurs.
Example Sentence 1
Modern light aircraft incorporate crashworthiness features such as energy-absorbing seats and four-point harnesses to improve occupant survival in an accident.
Example Sentence 2
Designers increased the airplane's crashworthiness by adding energy-absorbing seats and stronger cabin framing.