(b)
 VHF scan mask (Ref. Fig. 003) A specific table called "VHF scan mask" lists the service providers contracted by the airline (no frequency information stored in this table). This table is used by the Router in manual and scan modes to scan only on the contracted service providers. The VHF scan mask is selected on the VHF3 SCAN MASK page and displayed on the VHF3 DATA MODE page where the crew selects the service provider to be scanned.

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 The VHF scan mask is compulsory for the router operation.
 For all frequency acquisition methods, except autotune method,
 only the frequencies acceptable by the airline (DSP contracted by
 the airline) are used by the Router.

 1 Service Providers

_ In manual mode, the Router scans on a specific service provider region. The ATSU uses this information to retrieve internally the frequency.
 There are five world service providers: --------------------------------------------------DSP Frequency --------------------------------------------------SITA Europe 131.725 MHz SITA Pacific 131.550 MHz ARINC EUROPE 136.925 MHz ARINC USA 131.550 MHz AVICOM 131.450 MHz AIR CANADA 131.475 MHz
 NOTE : The ATSU permanently reports to the crew, via the VHF3
____ DATA MODE page, the SP region it is operating on.
 (6) Not Applicable

R **ON A/C 106-149, 151-156, 159-199, 201-299, 301-399, 401-499,
 Post SB 46-1009 For A/C 151-152,201-203,
 Post SB 46-1013 For A/C 151-156,201-209,

 (5) VHF frequency control (Ref. Fig. 009A) The airline and the ATC ground centers can exchange data with the aircraft through ground networks called Service Providers. Since all the networks are interconnected, the data can be transferred over any network.
 (a) ARINC 618 acquisition methods
 -Manual: a service provider region is selected on VHF3 DATA MODE page
 -Scan mode: when no communication with the ground is established using the current service provider, the ATSU starts scanning the list of service providers selected in the VHF3 SCAN SELECT page and displayed in the VHF3 DATA MODE page
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 -Automatic scan: this mode enables, when the aircraft is leaving a given VHF zone and entering another one, to quicken the frequency acquisition process. This mode is based on the use of a VHF world map, giving a list of service providers for each area. The router retrieves the corresponding service provider from the DSP world map database.
 -Remote: change of frequency on reception of an autotune uplink message.
 (b)
 VHF SCAN MASK (Ref. Fig. 003A) The VHF scan mask selected on the VHF3 SCAN SELECT page is displayed on the VHF3 DATA MODE page where the crew selects the service provider to be scanned. The VHF3 scan mask is compulsory for the router operation. For all frequency acquisition methods, except autotune method, only the frequencies acceptable by the airline (DSP contracted by the airline) are used by the Router. A specific table called "VHF scan mask" lists the service providers contracted by the airline (no frequency information stored in this table). This table is used by the Router in manual and scan modes to scan only on the contracted service providers.

 (c)
 Service Providers In manual mode, the Router scans on a specific service provider region. The ATSU uses this information to retrieve internally the frequency.

 The service providers are: ---------------------------------------------------------Service Provider ATSU Name Frequency ---------------------------------------------------------
SITA Europe/Africa  SIT-E/A  131.725 MHz
 SITA Latin America  SIT-LAM  131.725 MHz
 SITA North America  SIT-NAM  136.850 MHz
 SITA Pacific  SIT-PAC  131.550 MHz
 DEPV BRAZIL  DEPV  131.550 MHz
 AVICOM JAPAN  AVICOM  131.450 MHz
 ARINC Africa  ARI-AFR  126.900 MHz
 ARINC America  ARI-AM  131.550 MHz
 ARINC Asia  ARI-ASI  131.450 MHz
 ARINC Europe  ARI-EUR  136.925 MHz
 ARINC Korea  ARI-KOR  131.725 MHz 

R 1EFF : 106-149, 151-156, 159-199, 201-299, 1 46-24-00Page 62 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1 NOTE : The ATSU permanently reports to the crew, via the VHF3

____ DATA MODE page, the SP region it is operating on.
 (6) Not Applicable
 **ON A/C 151-158, 201-209,
 Post SB 46-1009 For A/C 151-152,201-203,
　
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