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Old 1st Dec 2021, 09:47
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GBO
 
Join Date: Mar 2008
Location: Australia
Posts: 118
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At the last Malaysian primary radar position (1822:12), the aircraft was 10 NM NW of MEKAR tracking NW towards NILAM. My estimate has the aircraft flying from Penang at M0.84/FL360

At 1825:27, approximately 2 NM west of NILAM, the SATCOM logs on. However, the Flight ID was missing (FMC software reset following failure of Left FMC?)

Interestingly, IF the aircraft was flying to Banda Aceh via NILAM and SANOB with an unresponsive crew, then:
  1. At the TOPD point for Banda Aceh, the aircraft would slow to the ECON descent speed (250knots for CI 0) while maintaining FL360.
  2. As the aircraft turns left at NILAM to SANOB, the SATCOM log on coincides with the exact time when the SATCOM switches from the left High Gain Antenna (left inoperative?) to the right High Gain Antenna. The Indian Ocean satellite is now on the right side of the fuselage (track to satellite is approx 261T)
  3. The aircraft would overfly Banda Aceh maintaining FL360/250KIAS, where it reverts to mag heading. It continues south and passes all satellite arcs on time, IF one auto throttle was inoperative at TOPD (Left A/T inoperative?). Ends near 34S93.5E with flaps retracted. Not fully searched.
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