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{{DISPLAYTITLE:MH370 Chronology - Straits of Malacca to Andaman Sea}}
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[[Category:Straits of Malacca to Andaman Sea]]
<h2 style="text-align: center;">Straits of Malacca to Andaman Sea</h2>
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<h5 style="text-align: center;">From 1:52 MYT to 2:22:12 MYT {{Day:1}}<br />
(17:52 UTC to 18:22:12 UTC {{Day:-001}})</h5>


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<h5>1. Last Primary Radar Observation at 1822:12 UTC (0222:12 MYT)</h5>
<p>The last Military primary radar observation of MH370 is described in the {{SIR2018/Ref}} as follows:-</p>
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<p>At 1803:09 UTC [0203:09 MYT] the “blip” disappeared, only to reappear at 1815:25 UTC [0215:25 MYT] until 1822:12 UTC [0222:12 MYT], about 195 nm from Butterworth, on a heading of 285°, speed of 516 kt and at an altitude of 29,500 ft.</p>
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<p>The radar track of MH370 is shown in <i>Figure 2</i> opposite.<br />
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     <li>The civilian Air Traffic Control radar track (secondary radar) is shown as the pale line from Kuala Lumpur to the last secondary radar observation at 1722 UTC (0122 MYT).</li>
     <li>The Military primary radar track is shown as a yellow line from the turnback near waypoint IGARI, across Malaysia and north-west along the Malacca Strait.</li>
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<p>The exact latitude and longitude of MH370 at 0222:12 MYT is not provided, but from the graphic it can be seen that MH370 is located north-east of the tip of Sumatra and heading north-west towards the Andaman Sea.</p>
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<h5>2. SATCOM Log-on Request at 1825:27 UTC (0225:27 MYT)</h5>
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<p>At [[Flight MH370/2014-03-08/02-25-27 MYT|0225:27 MYT]] the satellite data unit (SDU) on MH370 seems to have recovered from a power interruption and initiated a log-on sequence with the Inmarsat satellite communication system. The satellite data link was lost some time between 
1707:48 and 1803:41 UTC, possibly due to a loss of electrical power. The reasons for these events is discussed in the {{SIR2018/Ref}} and the extracts linked from each event in the Timeline.</p>
<p>Investigators have called this log-on event the first ‘handshake’ - because it was a successful communication between the aircraft and the ground station via the satellite.</p>
<p>The other benefit of this communication is the metadata associated with this transmission - the Burst Timing Offset (BTO) provides an indication of the distance of the aircraft from the satellite at that time. This is shown graphically (with other 'handshakes') as a series of concentric circles, or rings, in <i>Figure 18</i> below. Since only part of the ring is technically feasible, the valid section is called an 'arc'.</p>
<p>In the diagram opposite, the position of MH370 is shown on this first, 1825 UTC arc.</p>
<p>It seems unlikely that the heading has changed significantly in the short period since the last primary radar observation.</p>
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<h5>Malaysian Military Radar</h5>
<p>On this page the military radar observations provide a context and background for other events related to flight MH370 during the 'Air Turnback' - from the loss of contact to the last primary radar observation as MH370 was heading towards the Andaman Sea, west of Malaysia.</p>
<p>A 'blip' believed to be MH370 was observed from 1721:13 UTC [0121:13 MYT] to 1822:12 UTC [0222:12 MYT]</p>
<p>A 'blip' is a spot of light on a radar screen indicating the position of a detected aircraft.</p>

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