Aeroperú Flight 603
![N52AW, the aircraft involved in the accident, photographed in [[Miami International Airport|Miami]] in January 1996](https://upload.wikimedia.org/wikipedia/commons/3/38/Aeroper%C3%BA_Boeing_757-200_N52AW_MIA_1996-1-8.png)
Flying over water, at night, with no visual references, the pilots were unaware of their true altitude, and struggled to control and navigate the aircraft. The investigation determined that the air data computers were unable to show correct airspeed and altitude on cockpit displays because a maintenance worker had failed to remove tape covering the pitot-static system ports on the aircraft exterior prior to departure. Provided by Wikipedia