Bird strike.

CFR · 2024-01-01 · US · Title 14

The rotorcraft must be designed to ensure capability of continued safe flight and landing (for Category A) or safe landing (for Category B) after impact with a 2.2-lb (1.0 kg) bird when the velocity of the rotorcraft (relative to the bird along the flight path of the rotorcraft) is equal to V

official document · source cfr-2024 · id 14:§ 29.631