I can only see 2 possible scenarios.
1. Total sudden loss of all electrical power. Transponder, ACARS, radios stop functioning. Screens go blank. Pilots relying on very limited information to keep the plane airborne. Start turning back towards KL but become disoriented and end up on the west side of the peninsula and then end up crashing into the water over there somewhere.
2. Intentionally turning off all tracking equipment (transponder,ACARS) then attempting to avoid radar, heading west then flying for who knows how long to who knows where.
http://avherald.com/h?article=4710c69b&opt=6144
Quote:
On Mar 11th 2014 Malaysia's Air Force reported their primary radar data suggest, the aircraft may have turned west over the Gulf of Thailand at about 1000 meters/3000 feet below the original flight level (editorial note: another possible interpretation could be: at 1000 meters of height compared to 10000 meters original level) and flown past the east coast near Khota Baru and the west coast of Malaysia near Kedah, the radar return was last seen at 02:40L near Pulau Perak in the Straits of Malacca, about 285nm westsouthwest of the last known (secondary) radar position. Local Police at Khota Bharu confirmed a number of locals reported lights and a low flying aircraft at Khota Bharu at an estimated height of 1000 meters/3000 feet.
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