Time:1554:53 UTC

Time:1554:53 UTC

0. Event Time and Type

Event Time:  23:54:53 MYT   Edit.

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Event Type: satcom acars   Edit.

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1. Summary ..................................................................................................Edit

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ACARS used the SATCOM system to indicate that the VHF datalink had been 'lost'.

This indicates that the VHF radio (VHF3) had been switched from data to voice in accordance with the instruction from Malaysia Airlines Operations Centre at 23:54:31 MYT.

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2. Details .......................................................................................................Edit

1. Safety Investigation Report MH370/01/2018 Appendix 1.9A

   
   

   Time 15:54:53	Trans 46817964	Direction Incoming Downlink	AN 9M-MRO	FI MH0000	Medium POR1	Machine MHKULKJACM001	Raw DTG 071555	SMI MED	Application RELAY
   Status Normal		Message Type Lost VHF			Source/Destination QXSXMXS

   QU DPCCAMH
   .QXSXMXS 071555
   MED
   FI MH0000/AN 9M-MRO
   DT QXT POR1 071555 S06A
   - 0LV155453S

   
   

   
   

   Time 15:54:53	Trans 46817964	Direction Incoming Downlink	AN 9M-MRO	FI MH0000	Medium POR1	Machine MHKULKJACM001	Raw DTG 071555	SMI MED	Application RELAY
   Status Normal		Message Type Lost VHF			Source/Destination QXSXMXS

   QU DPCCAMH
   .QXSXMXS 071555
   MED
   FI MH0000/AN 9M-MRO
   DT QXT POR1 071555 S06A
   - 0LV155453S

   
   

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3. Notes .........................................................................................................Edit

1. The VHF datalink was 'lost' because the radio used for data (VHF3) was switched from data to voice in accordance with the instruction from Malaysia Airlines Operations Centre at 23:54:31 MYT.

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References for events at or about the time of 2354:53 MYT, 7 March 2014 (1554:53 UTC, 7 March 2014).

To return to the Timeline click on the button:-

Pre-Flight

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Narrative

<section begin=Narrative />

23:54:53 MYT, 7 March 2014

ACARS: Lost VHF

ACARS used the datalink established via SATCOM to indicate that the (previous) VHF datalink had been 'lost', meaning that the system had been switched over to the SDU and is now using the satellite communication system. However, the SDU was still using the Inmarsat POR-1 satellite, and no flight ID had been entered.

Source	Aircraft Communication and Reporting System (ACARS) on aircraft 9M-MRO
Destination	SITA (QXSXMXS)
Message	Lost VHF
Satellite	POR1
Flight ID	Not provided

          <section end=Narrative />

References

Item 1

Transcript

{{#lst:Content:FI Appendix 1.9A/1554:53 UTC|Reference}} {{#lst:Content:FI Appendix 1.9A/1554:53 UTC|FullText}}

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Notes

1. When an aircraft is on the ground, the ACARS system can communicate using a datalink over VHF radio. This message follows the establishment of a datalink via the SATCOM system at 2354:41 MYT and simply means that ACARS is not using the VHF.

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Coordinated Universal Time

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

Aircraft Communication and Reporting System

Satellite Communications

Very High Frequency

Aircraft Number

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

Flight ID

Inmarsat geostationary satellite above the Pacific Ocean

Unique hardware (machine) ID

Date and Time (UTC) in DD/HH/MM format

Date and Time (UTC) in DD/HH/MM format

Standard Message Identifier

ACARS lost data link over VHF (disconnected)

An identifier for SITA, a service provider for ACARS messages.

An identifier for SITA, a service provider for ACARS messages.

Invalid Flight ID: MH for Malaysia Airlines but no flight number

Aircraft Number (Registration) 9M-MRO

ACARS lost data link over VHF (disconnected) at 15:54:53 (UTC)

Satellite Data Unit

Pacific Ocean Region

Identification

Société Internationale de Télécommunications Aéronautiques

Flight Identifier, for example MH370