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The Boeing 737 has a history of rudder system-related anomalies, including numerous instances of jamming. A number of accidents and incidents were the result of the airplanes' unexpected movement of their rudders. During the course of the four and a half year investigation of the crash of USAir Flight 427 near Aliquippa, Pennsylvania, killing 132 people, the NTSB discovered that the PCU's dual servo valve could jam as well as deflect the rudder in the opposite direction of the pilots' input, due to thermal shock, caused when cold PCUs are injected with hot hydraulic fluid. This finally solved the mystery of sudden jamming of the rudders of this aircraft.
The immediate human toll of the 1994 Flight 427 disaster was staggering: all 132 people aboard died on a Pennsylvania hillside. The subsequent investigation was a maze of politics, bizarre theories, and shrouded answers. Bill Adair, an award-winning journalist, was granted special access to the five-year inquiry by the National Transportation Safety Board (NTSB) while its investigators tried to determine if the world's most widely used commercial jet, the Boeing 737, was really safe. Their findings have had wide-ranging effects on the airline industry, pilots, and even passangers. Adair takes readers behind the scenes to show who makes decisions about airline safety—and why.
On 25 December 2003, Union des Transport A riens de Guin e Flight GIH 141, a Boeing 727-223, on a flight from Conakry (Guinea) to Kufra (Libya), Beirut (Lebanon) and Dubai (United Arab Emirates) stopped over at Cotonou, Republic of Benin. During takeoff the overloaded airplane, was not able to climb properly and struck an airport building on the extended runway centerline, and crashed onto the beach and ended up in the ocean, killing 151 of the 163 people on board. The cause of the accident was the difficulty for the flight crew to rotate with an overloaded airplane with an unknown center of gravity. This in combination with the facts that the operator of the airline lacked any competence regarding organization and regulatory documentation, which made it impossible to correctly load and check the loading of the airplane, and the inadequacy of the supervision exercised by the Guinean civil aviation authorities in the context of safety oversight.
On December 20, 1995, American Airlines Flight 965, a Boeing 757-223, was on a scheduled passenger flight from Miami, Florida, U.S.A., to Cali, Colombia. Close to its final destination the pilots erroneously cleared the approach waypoints from their navigation computer. When the controller asked the pilots to check back in over Tulua, north of Cali, it was no longer programmed into the computer. They were lost and the aircraft crashed into a mountain. Of the 163 people on board, 4 passengers survived miraculously the accident.
On April 15, 2002, Air China flight 129, a Boeing 767-200ER, operated by Air China, en route from Beijing, China to Busan, Korea, crashed on Mt. Dotdae, near Gimhae Airport, Busan. Of the 166 persons on board, 37 persons survived the crash, while 129 occupants were killed. The Korean Aviation Accident Investigation Board (KAAIB) determined that the probable cause of the crash was pilot error due to poor crew resource management and lost situational awareness during the circling approach of the runway. The Chinese investigation team pointed out that the Korean ATC was not fully licensed and mistakenly directed the airliner to descend to a wrong altitude and that the airport did not inform the crew of the weather conditions at the time. A contributing factor was that the airline made all announcements in Chinese and English, while most passengers were Korean.
On 4 October 1992, El Al Israel Airlines Flight 1862, a Boeing 747-200 Freighter, departed from Schiphol Airport, Amsterdam, on its way to Tel Aviv, Israel. Seven minutes after take-off the plane lost engine no. 3 and 4 and crashed in an apartment block just outside Amsterdam, killing 43 people. The investigation concluded that the design and certification of the B 747 pylon was inadequate to provide the required level of safety. Furthermore the system to ensure structural integrity by inspection failed.
On October 31, 1999, EgyptAir flight 990, a Boeing 767-366ER, crashed into the Atlantic Ocean 60 miles south of Nantucket, Massachusetts. All 217 people on board were killed, and the airplane was destroyed. According to the Egyptian Investigation Team a mechanical defect is the most likely cause of the accident, there is no credible evidence to support a conclusion that the First Officer intentionally dove the airplane into the ocean in fact.
During the night of 04th May 2007, the B737-800, registration 5Y-KYA, operated by Kenya Airways as flight KQA 507 from Abidjan international airport (C te d'Ivoire), to the Jomo Kenyatta airport Nairobi (Kenya), made a scheduled stop-over at the Douala international airport (Cameroon). The weather was stormy. A number of departing planes decided to wait for the weather to improve. Kenya Airways, however, decided to depart. Shortly after take-off at about 1000 ft, the aircraft entered into a slow right roll that increased continuously and eventually ended up in a spiral dive. On the 5th May 2007 at approximately 0008 hrs, the airplane crashed in a mangrove swamp South-South/East of Douala. All 114 people on board were killed and the airplane was completely destroyed. The airplane crashed after loss of control by the crew as a result of spatial disorientation, after a long slow roll, during which no instrument scanning was done, and in the absence of external visual references in a dark night.
On July 26, 2002, about 0537 eastern daylight time, Federal Express flight 1478, a Boeing 727-232F, on its way from Memphis International Airport to Tallahassee Regional airport, struck trees on short final approach and crashed short of runway 9 at the Tallahassee Regional Airport, Florida. The flight was operating as a scheduled cargo flight from Memphis, to Tallahassee. The captain, first officer, and flight engineer were seriously injured, and the airplane was destroyed by impact and resulting fire. Night visual meteorological conditions prevailed for the flight, which operated on an instrument flight rules flight plan. The National Transportation Safety Board determines that the probable cause of the accident was the crew's failure to establish and maintain a proper glidepath during the night visual approach to landing. Contributing to the accident was a combination of the captain's and first officer's fatigue, the crew's failure to monitor the approach, and the first officer's color vision deficiency.
On December 29, 1972 an Eastern Air Lines' Lockheed L-1011, as Flight 401 on its way from John F. Kennedy International Airport, New York, to Miami International Airport, Miami, Florida, crashed at 2342 eastern standard time in the Everglades, approximately 18 miles west northwest of Miami International Airport. The aircraft was destroyed. There were 163 passengers and a crew of 13 aboard the aircraft, 99 people died in the crash. The flight was diverted because of problems with the nose landing gear The aircraft climbed to 2,000 feet while the crew attempted to correct the problem. Surviving passengers and crewmembers stated that the flight was routine and operated normally before impact with the ground. The National Transportation Safety Board determines that the probable cause of this accident, was preoccupation with a malfunction of the nose landing gear position indicating system distracted the crew's attention from the instruments and allowed the descent to go unnoticed.