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Indonesian investigators have determined that the captain of a Sukhoi Superjet 100 inhibited the terrain-collision system, believing its alerts to be erroneous.
The terrain-awareness system initially sounded 38s before the aircraft struck the slope of Mount Salak on 9 May this year, killing all 45 occupants who were participating in a demonstration flight.
Investigators from the National Transportation Safety Committee found the crew had requested a descent to 6,000ft and to fly a right-hand orbit. This was "approved" by Jakarta air traffic control.
In 2012 The Jakarta Post dubbed Mount Salak an "airplane graveyard". High turbulence and fast-changing weather conditions of the mountainous terrain are cited as contributing factors to multiple aviation crashes in the area. There were seven aviation crashes around Mount Salak between 2002 and 2012.
One person was killed in the crash of a small aircraft in October 2002; seven in October 2003; two in April 2004; five people in June 2004; 18 people were killed in a crash of an Indonesian Air Force military plane in 2008.  In 2012, three people were killed in a crash of a training aircraft not long before the SSJ-100 accident, which occurred on May 9, 2012, when a Sukhoi Superjet 100 crashed into the mountain during a demonstration flight, killing all 45 people on board.