Flight MH370/Chronology/Phase 4: Difference between revisions

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{{DISPLAYTITLE:Flight MH370 Chronology - Straits of Malacca to Andaman Sea}}
{{DISPLAYTITLE:Phase 4 - 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 />
<ul class="ulNormal">
    <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>
</ul></p>
<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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          {{Image:ATSB/UnderwaterSearch/Figure 2}}
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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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        {{Image:BayesianMethods/Figure 4.3}}
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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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Latest revision as of 08:52, 26 August 2026


Ground or Ground-to-Air Events

Aircraft or Air-to-Ground Events

8 March 2014   01:52:35 MYT

Radar target P3426 dropped from KL ACC radar display. Last primary civilian radar contact with the aircraft.

8 March 2014   01:57:49 MYT

HCM ACC informs KL ACC there has been officially no contact with MH370. Attempts on many frequencies and via relay through other aircraft have received no response.

8 March 2014   02:03:23 MYT

MAS ODC sends ACARS message to MH370; message fails to reach the aircraft. Retransmissions attempted until 1843:33 UTC; all fail.

8 March 2014   02:03:34 MYT

nul

8 March 2014   02:03:41 MYT

Perth GES initiates a Data-2 ACARS uplink to MH370 but receives no acknowledgement; confirms SATCOM link was lost at some time between 1707:48 and 1803:41 UTC.

8 March 2014   02:03:48 MYT

KL ACC queries HCM ACC on status of MH370; HCM ACC confirms no radar contact and no verbal communication. KL ACC relays Malaysia Airlines Operations information that aircraft was in Cambodian airspace.

8 March 2014   02:05:11 MYT

Perth GES initiates a Data-2 ACARS uplink; no acknowledgement from SATCOM (link still lost).

8 March 2014   02:07:47 MYT

HCM ACC queries KL ACC for confirmation that MH370 was in Phnom Penh FIR; Cambodia has no information on MH370.

8 March 2014   02:12:15 MYT

KL ACC informs HCM ACC there is no update on the status of MH370.

8 March 2014   02:15:00 MYT

KL ATSC Watch Supervisor queries Malaysia Airlines Operations; MAS informs aircraft was able to exchange signals with Flight Explorer (flight tracker). No voice recording; sourced from Watch Supervisor Log Book.

Kuala Lumpur Area Control Centre (or Air Traffic Control Centre)

Ho Chi Minh (Viet Nam) Area Control Centre (or Air Traffic Control Centre)

Malaysia Airlines Operations Despatch Centre

Aircraft Communication and Reporting System

Coordinated Universal Time

Ground earth station. A satellite ground station sends or receives data from orbiting satellites. (Source: ATSB)

satellite communications from ground to the aircraft earth station

Satellite Communications

Flight Information Region

Kuala Lumpur Air Traffic Services Centre

Malaysia Airline Systems

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