A Ukrainian SU-27 pilot executing a landing on a highway as a part of a military sucked a highway sign into his air intake.
According to authorities, there was no damage to the aircraft, and no injuries.
When one considers that it not only took in the sign, which was probably either thin aluminum and wood, but also parts of the sign post (probably steel) and bolts attaching the sign to the post, this is an indication of how Soviet era engine designers prioritized resistance to foreign object damage: (FOD)
Ukrainian Su-27 fighter jet rammed into a street sign during military drills, 2+2 broadcaster reported, showing the video of the incident. The plane was landing on the Kiev-Chop highway when it grazed the sign and then pulled up in the sky again, with a metal part stuck in its air scoop. The Ukrainian air forces later stated it was a minor incident, noting that the plane was not damaged and the pilot didn’t sustain any injuries.