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SilkAir Flight 185 was a scheduled SilkAir passenger flight from Jakarta, Indonesia, to Singapore, which crashed into the Musi River near Palembang in southern Sumatra, on 19 December 1997, killing all 97 passengers and seven crew on board. The cause of the crash was independently investigated by two agencies.〔(【引用サイトリンク】url=http://aviationknowledge.wikidot.com/asi:silkair-flight-185:pilot-suicide )〕 The aircraft was built by Boeing in the United States, and the US National Transportation Safety Board (NTSB), under lead investigator Greg Feith, participated in the investigation of the crash. They concluded that the crash was the result of deliberate flight control inputs, most likely by the captain.〔〔 The Indonesian National Transportation Safety Committee (NTSC), led by Engineering Professor Oetarjo Diran, was unable to determine a cause of the crash.〔 Another potential factor that led to the crash of the 737 aircraft was the power control unit (PCU) that controlled the aircraft's rudder, which was the culprit in previous 737 crashes. Although the NTSB and PCU manufacturer Parker-Hannifin had already determined that the PCU was properly working, and thus not the cause of the crash, a private investigation into the crash for a civil lawsuit tried by jury in a California state court in Los Angeles, which was not allowed to hear or consider the NTSB's and Parker-Hannifin's conclusions, decided that the crash was caused by a defective servo valve inside the PCU, based on forensic findings from an electron microscope which determined that minute defects within the PCU had caused the rudder hard-over and a subsequent uncontrollable flight and crash.〔 The manufacturer of the aircraft's rudder controls and the families later reached an out-of-court settlement.〔 ==Flight history== The aircraft operating flight 185 was a Boeing 737-300 with manufacturer serial number 28556, registered as 9V-TRF and was powered by two CFM56-3B2 engines.〔(【引用サイトリンク】url=http://www.airfleets.net/crash/crash_report_Silkair_9V-TRF.htm )〕 Having completed its maiden flight in January 1997, the aircraft was delivered to SilkAir in February 1997, 10 months before the crash.〔(【引用サイトリンク】url=http://www.planespotters.net/Production_List/Boeing/737/28556,9V-TRF-SilkAir.php )〕 At the time of the accident, it was the newest aircraft in SilkAir's fleet and had accumulated 2,238 flight hours in 1,306 cycles.〔〔(Report No. 3, Friday 19 December 1997, 2145hrs (Singapore time) ), SilkAir.〕 Carrying 97 passengers and a crew of seven, the Boeing 737 departed Jakarta's Soekarno-Hatta International Airport's runway 25R at 15:37 local time (08:37 UTC) for a planned 80-minute flight to Singapore Changi Airport, with captain , 41, a former A-4 Skyhawk pilot, at the controls along with first officer Duncan Ward, 23, of New Zealand.〔〔 Generally fair weather was expected for the route, except for some thunderstorms near Singkep Island, south of Singapore.〔 The aircraft was cleared to climb to flight level 350 (FL350), about , and to head directly to Palembang.〔 At 15:47:06, while climbing through , the crew requested clearance to proceed directly to waypoint .〔ATC reporting point north of Palembang.〕〔(【引用サイトリンク】url=http://www.fallingrain.com/waypoint/ID/PARDI.html )〕 At 15:53, the crew reported reaching the cruise altitude of FL350 and was cleared to proceed directly to PARDI, and to report abeam Palembang. At 16:05, the cockpit voice recorder (CVR) ceased recording. According to the TV series ''Mayday'', Captain Tsu took the opportunity of leaving the cockpit to trip the circuit breaker. At 16:10, the air traffic controller informed the flight that it was abeam Palembang and instructed the aircraft to maintain FL350 and to contact Singapore Control upon reaching PARDI. First Officer Ward acknowledged this call. At 16:11, nearly six minutes after the CVR ceased recording, the flight data recorder (FDR) ceased recording. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「SilkAir Flight 185」の詳細全文を読む スポンサード リンク
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