Active Takeoff Crack [better] -

The primary causes of active takeoff cracks are:

The generation of an active crack during takeoff is rarely the result of a single stressor. Instead, it is a synergistic failure mode involving three primary factors: active takeoff crack

Landing gear struts must support the full weight of the aircraft during the ground roll. Instances of ATC in gear struts usually involve pre-existing corrosion pits. During the high-speed takeoff roll, dynamic oscillations (shimmy) can induce resonance. This turns a corrosion pit into an active shear crack, risking gear collapse during rotation. The primary causes of active takeoff cracks are: