On 1 January 2007, a Boeing 737-4Q8, operated by Adam Air as flight DHI 574, was on a flight from Surabaya, East Java to Manado, Sulawesi, at FL 350 (35, 000 feet) when it suddenly disappeared from radar. There were 102 people on board.. Nine days later wreckage was found floating in the sea near the island of Sulawesi. The black boxes revealed that the pilots were so engrossed in trouble shooting the IRS that they forgot to fly the plane, resulting in the crash that cost the lives of all aboard.