A preliminary BFU report confirms the nose landing gear locking pin was not inserted during a test of a Lufthansa Boeing 787-9 at Frankfurt Airport on 4 June 2026. The pin was later found in a storage box, indicating a critical human error in pre-flight or maintenance testing procedures. The incident caused the nose gear to collapse, injuring two crew members seriously and 21 ground staff lightly. No passengers were aboard as the aircraft prepared for flight LH450 to Los Angeles. The BFU explicitly states no accident cause has been named yet; root cause investigation remains ongoing. This mirrors a 2021 British Airways incident where incorrect pin placement triggered gear retraction. Operators must reinforce strict checklists for landing gear safety pins, especially on new aircraft types like the 787-9, to prevent structural damage and injuries.