The A5M's pursuit of lightness did not eliminate every protective feature. A metal bar rose behind the open cockpit to preserve space around the pilot if the aircraft overturned during a landing accident. That detail mattered because the fighter was expected to use carrier decks and rough, unpaved airfields where a nose-over or rollover was plausible. Designers accepted this small weight penalty because it improved a pilot's chance of surviving the accident.
Notable Point · 29:29-30:20
A rollover bar protected the A5M's open cockpit
A metal bar behind the pilot added a practical survival feature for an open-cockpit fighter operating from carriers and rough airfields.