Pan Am Flight 845 was a Boeing 747-121, registration N747PA, operating as a scheduled international passenger flight between Los Angeles and Tokyo, with an intermediate stop at San Francisco International Airport (ICAO: KSFO). On July 30, 1971, at 15:29 PDT, while it was taking off from San Francisco bound for Tokyo, the aircraft struck approach lighting system structures located past the end of the runway, which seriously injured two passengers and caused significant damage. The crew continued the takeoff, flew out over the ocean and circling while it dumped fuel, and eventually returned for a landing in San Francisco. After coming to a stop, the crew ordered an emergency evacuation during which 27 passengers were injured exiting the aircraft, and 8 of them suffered serious back injuries. The accident was investigated by the NTSB, which determined the probable cause was the pilot's use of incorrect takeoff reference speeds. The NTSB also found various procedural failures in the dissemination and retrieval of flight safety information, which had contributed to the accident. Aircraft and crew The Boeing 747-121, registration N747PA, manufacturer's serial number 19639, first flew on April 11, 1969 and was delivered to Pan Am on October 3, 1970. It was the second 747 off Boeing's production line but was delivered only nearly ten months after Pan Am's first 747 flight. Originally named Clipper America, it had logged 2,900 hours of operation at the time of the accident. The flight crew of Flight 845 consisted of five (a captain, a first officer, a flight engineer, a relief flight engineer, and a relief pilot). The captain was Calvin Y. Dyer, a 57-year-old resident of Redwood City, California, a pilot with 27,209 hours of flying experience, 868 of which were on the 747. The first officer was Paul E. Oakes, a 40-year-old resident of Reno, Nevada, with 10,568 hours of experience, 595 on the 747. The flight engineer was Winfree Horne, who was 57 years old and from Los Altos, California, and had 23,569 hours of flight experience, 168 of them on the 747. The 34-year-old second officer, Wayne E. Sagar, was the relief pilot and had 3,230 hours of flight experience, 456 of them on the 747. The relief flight engineer was Roderic E. Proctor, a 57-year-old resident of Palo Alto, California, who had 24,576 flight hours, 236 of them on the 747. On July 29, 1971, Dyer, Oakes, Horne, Sagar and