Time:1559:57 UTC

References for events at or about the time of 2359:57 MYT, 7 March 2014 (1559:57 UTC, 7 March 2014).

The source document is cited first (with a link to the full text), followed by one or more relevant extracts.

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Pre-Flight

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Narrative

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23:59:57 MYT, 7 March 2014

Event Type

The SATCOM initiates a Log-On handover as Class 3 (voice and data capable) to the IOR I-3 satellite, using the HGA subsystem, with a valid Flight ID.

Information about this event is summarised in the table below.

Source	Satellite Data Unit on aircraft 9M-MRO
Destination
Message
Satellite
Antenna
Flight ID
BFO
BTO

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References

Item 1

RefID:Factual Information March 2015/1.9.5.4

1.9.5.4 SATCOM Ground Station Logs - Key Observations in Chronological Order

4. 1559:57 - The SATCOM initiates a Log-On handover as Class 3 (voice and data capable) to the IOR I-3 satellite, using the HGA subsystem, with a valid Flight ID.

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Notes

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Malaysian Time (MYT) is Coordinated Universal Time (UTC) + 8 hours

Coordinated Universal Time

Satellite Communications

Inmarsat geostationary satellite above the Indian Ocean

HGAs

High Gain Antenna(s)

Flight Identifier, for example MH370

Aircraft Registration Number for the Boeing 777 used for Flight MH370. More Info

Burst frequency offset. BFO is a measure of the difference between the expected frequency of a satellite transmission and the frequency received at the ground station. (Source: ATSB)

Burst Timing Offset. BTO is a measure of the time taken for a satellite transmission round trip (ground station to satellite to aircraft and back) and allows a calculation of the distance between the satellite and the aircraft. (Source: ATSB)