Incorrect Vr entry and poor cross‑check led to Air Atlanta 747F tail‑strike at Frankfurt Hahn
German investigators found an Air Atlanta Icelandic Boeing 747-400F suffered a tail‑strike on takeoff from Frankfurt Hahn after the captain entered rotation speed 141 kt — 30 kt below the correct 171 kt — into the FMS. Insufficient crew cross‑checks triggered a stall warning and missed the error.