(3)
 Printing In dual mode, automatic prints contain data from the ACARS Master. In dual mode, manual prints contain data from the FM which initiated the request. In order to prevent multiple requests of the same type when operating in a dual mode, a manual request for print data behaves as a request from a single FM, regardless of where it originated, and while the request is inhibited, it is inhibited on both FMs.

 When the FMs are in independent or single operation, each FM prints independently.

 (4)
 FMS to ATSU Communications Communications with an ATSU in Dual, Independent or Single mode behaves the same as that for an ACARS, except where otherwise noted (eg. ADS broadcast data). Both FMs broadcast all the ADS frames and labels to the ATSU on ADS-X buses. The FM transmits ATC COMM responses and messages for other than ADS broadcast data to the ATSU on the ACARS output bus.

 (5)
 ATSU to FMS Communications In a configuration where an ATSU is installed, the ACARS functions like an ATSU for communications in a Dual or Single mode. Uplink data from the ATSU, which includes both CPDLC requests as well as ADS 'TTG' requests, are sent only to the FM identified as the 'Communications Master', on the ATSU input bus (CPDLC messages are sent to the ATSU from the 'Communications Master' on the ATSU output bus. However, there are no 'ADS' reports sent back from the FM; instead, ADS data is broadcast from both FMs on the ADS buses). ATC COMM uplink messages are sent only to the FMGC identified as the 'Communication Master' on the ATSU input bus. The FM transmits these messages to the 'Guidance Master' as appropriate.

 (6)
 ATSU/Dual FM Configuration (Ref. Fig. 013)

 (7)
 FMS Communication Master computation The computation of the FMS Communication Master/Slave status is defined below depending on the FM operation mode. In Dual mode, if the state of communications on ACARS-MU-1 bus (ATSU to FM1 bus) is READY, the Communication Master FM is FM1. Else if the state of communication on ACARS-MU-2 bus (ATSU to FM2 bus) is READY, the Communication Master FM is FM2. Otherwise, when the state of communication is NOT READY for both buses ACARS-MU-1 and ACARS-MU-2, no Communication Master FM is defined. In Independent or Single mode, the Communication Master FM is the Guidance Master FMGC.

 Data Transmission when FMS 1 is in Communication (Communication Master)
 Figure 013

 E. ACARS Programming Options There are two levels of programming options available for the ACARS and printer functions:
R - through the AOC policy file of the AMI (Airline Modifiable
R Information), the airline may define the ACARS messages to be
R downlinked or uplinked, various automatic print functions associated
 with the datalinks which may be enabled or disabled and default R settings or selection
 -through designated FM pages, the crew may select the messages or reports to be printed automatically (as well as manually) and modify the default settings or selection.
 The statuses of the ACARS functions are not modifiable from the dedicated ACARS FUNCTION page. From this page, the pilot may also initiate several ACARS functions. The selection of the uplink messages and/or reports to be printed automatically and manually is performed through a dedicated PRINT FUNCTION page.
 (1) AOC policy file of the AMI Option programming for the ACARS and printer functions is obtained through an AOC policy file of the AMI. This file contains parameters and options defined by the airline to allow customization of FM functions such as allowing an airline to enable or disable various functions or facets of a function within the FM and to change the selected options on data base updates. The ACARS and print options described within this section only define the selectable ACARS and print options used within the FM and are a subset of the parameters within this file. The programming of the function is applied at initial power-up. Some of the options are pilot modifiable. If this file is not present, then all of the ACARS functions are inhibited. This section summarizes all of the options that are contained within the AOC policy file of the AMI related to the ACARS and printer functions.
 (a) Option/Function
 1 Data Link (AOC) inhibit:
_ This option determines whether or not any ACARS functions are to be utilized. It is supplemental to the OPC software option (AOC option activated) and can be used to disable the AOC function if it is installed.
 2 Flight Plan Data (FPN) request inhibit:
_ This option determines whether or not the uplink data and downlink requests of flight plan initialization data are allowed.

 NOTE : Performance data datalinks are not controlled by this
____
 option.

 3 Performance Data (PER) Request inhibit:
　
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