Content:SIR Table 1.9C - Revision history

GrantM at 14:06, 25 October 2023

2023-10-25T14:06:47Z

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GrantM at 07:03, 25 October 2023

2023-10-25T07:03:33Z

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GrantM at 06:29, 25 October 2023

2023-10-25T06:29:36Z

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-		<td>1. </td>
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-		<td>[[Timeline/Pre-Flight/1250:19 UTC|1250:19]]</td>
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-		<td>Prior to take-off, the SATCOM initiates a normal Log-On as Class 1 (data only capable) via the Pacific Ocean Region (POR) I-3 satellite, using the Low Gain Antenna (LGA) subsystem, suggesting that ADIRU (Air Data Inertial Reference Unit) navigation data was not available to the SDU at this time. No flight ID is sent to the GES at this time. This is the first SATCOM activity recorded at the GES since 0802:27, suggesting that the SATCOM was not powered for a period of several hours, whilst the aircraft was on ground. This is quite normal.</td>
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 		<td>2. </td>

GrantM at 06:25, 25 October 2023

2023-10-25T06:25:22Z

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GrantM at 06:24, 25 October 2023

2023-10-25T06:24:25Z

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	<p style="text-align:center"><b>Table 1.9C - Chronology of Satellite Communications Ground Station Logs</b></p>		<p style="text-align:center"><b>Table 1.9C - Chronology of Satellite Communications Ground Station Logs</b></p>
	<!-- Equivalent time in MYT, linked to Timeline, was removed on 11 Oct 2019. This table is now transcluded into SIR 2018:1 Factual Information/1.9/1.9.5 Satcom. -->		<!-- Equivalent time in MYT, linked to Timeline, was removed on 11 Oct 2019. This table is now transcluded into SIR 2018:1 Factual Information/1.9/1.9.5 Satcom. -->
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GrantM at 06:23, 25 October 2023

2023-10-25T06:23:14Z

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	~~<tr>~~
	~~<th style="width~~:~~5%">No~~. </~~th>~~
	~~<th style="width:10%">Time (UTC) </th>~~
	~~<th style="width:85%">Key Observations - Satellite Ground Station Logs</th>~~
	~~</tr>~~
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	<td>1. </td>		<td>1. </td>

GrantM at 06:15, 25 October 2023

2023-10-25T06:15:08Z

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GrantM at 05:25, 25 October 2023

2023-10-25T05:25:11Z

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	<td>1. </td>		<td>1. </td>
	<td>1250:19</td>		<td>[[Timeline/Pre-Flight/1250:19 UTC\|1250:19]]</td>
	<td>Prior to take-off, the SATCOM initiates a normal Log-On as Class 1 (data only capable) via the Pacific Ocean Region (POR) I-3 satellite, using the Low Gain Antenna (LGA) subsystem, suggesting that ADIRU (Air Data Inertial Reference Unit) navigation data was not available to the SDU at this time. No flight ID is sent to the GES at this time. This is the first SATCOM activity recorded at the GES since 0802:27, suggesting that the SATCOM was not powered for a period of several hours, whilst the aircraft was on ground. This is quite normal.</td>		<td>Prior to take-off, the SATCOM initiates a normal Log-On as Class 1 (data only capable) via the Pacific Ocean Region (POR) I-3 satellite, using the Low Gain Antenna (LGA) subsystem, suggesting that ADIRU (Air Data Inertial Reference Unit) navigation data was not available to the SDU at this time. No flight ID is sent to the GES at this time. This is the first SATCOM activity recorded at the GES since 0802:27, suggesting that the SATCOM was not powered for a period of several hours, whilst the aircraft was on ground. This is quite normal.</td>
	</tr>		</tr>
	<tr>		<tr>
	<td>2. </td>		<td>2. </td>
	<td>1555:57</td>		<td>[[Timeline/Pre-Flight/1555:57 UTC\|1555:57]]</td>
	<td>The SATCOM initiates a normal Log On Renewal as Class 1 (data only capable) via the POR I-3 satellite, using the LGA subsystem, this time with a valid Flight ID.</td>		<td>The SATCOM initiates a normal Log On Renewal as Class 1 (data only capable) via the POR I-3 satellite, using the LGA subsystem, this time with a valid Flight ID.</td>
	</tr>		</tr>
	<tr>		<tr>
	<td>3. </td>		<td>3. </td>
	<td>1557:49</td>		<td>[[Timeline/Pre-Flight/1557:49 UTC\|1557:49]]</td>
	<td>The SATCOM initiates a normal Log-On as Class 3 (voice and data capable) via the POR I-3 satellite, using the High Gain Antenna (HGA) subsystem, with a valid Flight ID. This suggests that the ADIRU derived navigation data has become available at this time.</td>		<td>The SATCOM initiates a normal Log-On as Class 3 (voice and data capable) via the POR I-3 satellite, using the High Gain Antenna (HGA) subsystem, with a valid Flight ID. This suggests that the ADIRU derived navigation data has become available at this time.</td>
	</tr>		</tr>
	<tr>		<tr>
	<td>4. </td>		<td>4. </td>
	<td>1559:57</td>		<td>[[Timeline/Pre-Flight/1559:57 UTC\|1559:57]]</td>
	<td>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. This suggests that the IOR is now considered to be the best available satellite. This is probably because either the line of sight to the IOR satellite is now clearer than that to the POR satellite, or the antenna gain in the direction of the IOR satellite has become higher than the antenna gain in the direction of the POR satellite.</td>		<td>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. This suggests that the IOR is now considered to be the best available satellite. This is probably because either the line of sight to the IOR satellite is now clearer than that to the POR satellite, or the antenna gain in the direction of the IOR satellite has become higher than the antenna gain in the direction of the POR satellite.</td>
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GrantM at 05:18, 25 October 2023

2023-10-25T05:18:15Z

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	<td>4. </td>		<td>4. </td>
	<td>~~[[{{TLPF}}/~~1559:57 ~~UTC\|1559:57]]~~</td>		<td>1559:57</td>
	<td>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. This suggests that the IOR is now considered to be the best available satellite. This is probably because either the line of sight to the IOR satellite is now clearer than that to the POR satellite, or the antenna gain in the direction of the IOR satellite has become higher than the antenna gain in the direction of the POR satellite.</td>		<td>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. This suggests that the IOR is now considered to be the best available satellite. This is probably because either the line of sight to the IOR satellite is now clearer than that to the POR satellite, or the antenna gain in the direction of the IOR satellite has become higher than the antenna gain in the direction of the POR satellite.</td>
	</tr>		</tr>