(2)
 Close the access door 824.

 (3)
 Remove the access platform(s).

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 Logic Diagram to Upload the ATSU Software
 Figure 402/TASK 46-21-34-991-002- 12 (SHEET 1)

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 Logic Diagram to Upload the ATSU Software
 Figure 402/TASK 46-21-34-991-002- 22 (SHEET 2)

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___________________________________________________________________________ SERVICES - DESCRIPTION AND OPERATION
____________________________________
 1. General
_______ The Standard Airline Operational Control (AOC) applications are datalink applications used by the Airline for maintenance, flight operations and administrative purposes. They are uploaded into the Air Traffic Services Unit (ATSU) by means of software disks composed of the AOC software (22TX) and the AOC database (24TX) which are located in the storage box.
 A. Remote AOC Applications
 (1)
 General
 The remote AOC applications are integrated in:

 -Flight Management and Guidance Computers (FMGCs) (Ref. AMM 22-83-00),
 -Centralized Fault Display Unit (CFDIU) (Ref. AMM 31-32-00),
 -Aircraft Condition Monitoring System, Data Management Unit (ACMS DMU) (Ref. AMM 31-36-00),
 -Cabin Terminals (CTs): Cabin Management Passenger Unit (CPMU) (Ref. AMM 23-74-00) and Digital Interface Unit (DIU) (Ref. AMM 23-34-00).

 (2)
 Function Remote airline applications include both Airline Operational Control (AOC) and Airline Administrative Communications (AAC) applications:

 (a)
 AOC applications AOC applications concern operations directly related to flight and maintenance purposes:

 -Maintenance applications are integrated in the CMCs and in the ACMS DMU.
 -
Flight operations applications are integrated in the FMGCs.

 -
Flight performance applications are integrated in the ACMS DMU.

 (b)
 AAC applications AAC applications concern administrative communications for the cabin crew and are integrated in the Cabin Terminals (CPMU and DIU).

 NOTE : For these reasons, the CMCs, FMGCs, DMU and Cabin
____ Terminals are named "remote AOC peripherals".
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 (1)
 General The AOC applications uploaded in the ATSU give the configuration and the architecture of the AOC menu which is accessible through any MCDU,

 (2)
 Function The main ground users of these applications are the Airline maintenance center, the Airline flight operations and passenger services. For the AOC applications, the ATSU is an airborne router in charge of:

 -receiving the airline uplink messages and routing them to the corresponding remote AOC peripheral,
 -acquiring the downlink messages from the remote AOC peripherals and sending them to the ground according to the airline routing policy.
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 2. System Description
__________________
 A. AOC Reports Transmission
 As soon as the ATSU initialization is achieved and the air/ground
 communication router is active, the AOC applications become active.

 (1)
 Mode of transmission The reports are either pre-defined, pre-formatted or free text. They can be generated:

 -automatically: the automatic mode is programmed into the peripheral (event, frequency,...). When the conditions are met for automatic transmission, the peripheral sends the required report to the ATSU. The remote AOC peripheral periodically attempts to send the message until the transmission is successful. In case of ATSU failure, the peripheral gives up the transmission.
 -
upon crew request on one MCDU

 -
upon reception of an uplink request: an uplink report request is received from the ground and transmitted by the ATSU to the concerned peripheral. An uplink request contains the type of the report to be generated and transmitted (report number) and sometimes, additional information such as trigger conditions. Only one transmission attempt is made.

 (2)
 Datalink communication status As no buffering capacity is offered by the ATSU, each AOC peripheral only transmits another message when the ATSU has completed the sending of the previous message to the ground. For this reason, the remote AOC peripheral continuously monitors the activity of the ATSU datalink communication to determine the peripheral datalink status. This status has two states: Ready or Not Ready depending on:
　
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