Time:0203:41 MYT
Time:0203:41 MYT
0. Event Time and Type
Event Time: 02:03:41 MYT Edit.
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Event Type: satcom acars Edit.
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1. Summary ..................................................................................................Edit
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2. Details .......................................................................................................Edit
Safety Investigation Report MH370/01/2018 Satellite Ground Station Logs - Key Observations
GES initiates a DATA-2 ACARS transmission (uplink), but receives no acknowledgement from the SATCOM.
- Therefore, the SATCOM Link was lost at sometime between 1707:48 and 1803:41.
- There is no evidence of a cockpit-initiated manual Log-Off of the SATCOM.
- Note that even if the on-board ACARs equipment was failed, disabled or powered down at this time, it would not prevent the SATCOM from acknowledging the ACARS-related P-Channel transmissions from the GES.
3. Notes .........................................................................................................Edit
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References for events at or about the time of 0203:41 MYT, Saturday, 8 March 2014.
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Narrative
<section begin=Narrative />
02:03:41 MYT
SATCOM: No acknowledgement from aircraft SDU
At 0203:23 MYT MAS ODC attempted to contact the aircraft by sending a text message to the cockpit printer, via ACARS. The service provider, SITA, would have forwarded the message to Inmarsat for transmission to the aircraft via a satellite communications datalink.
The Inmarsat GES initiated a DATA-2 ACARS transmission (uplink) at 1803:41 UTC (0203:41 MYT), but received no acknowledgement from the SDU on the aircraft 9M-MRO. Therefore, the SATCOM Link was lost at sometime between 0107:48 MYT and 0203:41 MYT.
There is no evidence of a cockpit-initiated manual Log-Off of the SATCOM.
<section end=Narrative />
References
Item 1
- Factual Information (2015) 1.9.5.4
1.9.5.4 SATCOM Ground Station Logs - Key Observations in Chronological Order
7. 1803:41 - GES initiates a DATA-2 ACARS transmission (uplink), but receives no acknowledgement from the SATCOM.
a. Therefore, the SATCOM Link was lost at sometime between 1707:48 and 1803:41.
b. There is no evidence of a cockpit-initiated manual Log-Off of the SATCOM.
Notes
- 1707:48 UTC is 0107:48 MYT
- Because the SDU on the aircraft did not respond, at 1803:41 UTC and again at 1805:11 UTC, the ACARS message could not be sent. Therefore ACARS returned the message to MAS ODC with the message type MAS-F (failed) at 0206:25 MYT).