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-for AOC hosted applications
. configuration/initialization
. downlink message entry/selection/transmission
. uplink message display
The pages managed by the ATSU are independently accessible from two MCDUs andare accessible in parallel on two MCDUs: access to and exit from MCDU pages are independent on these MCDUs.
NOTE : If a third MCDU is installed, only two MCDUs upon three can be
____
used simultaneously by the ATSU.
E. FWC Use The ATSU uses the services provided by the FWCs to activate visual/aural alerts and warnings for the different applications.
(1)
AOC alerts The AOC application is in charge of the activation and deactivation of the AOC alert while the FWC is in charge of the display of the corresponding green memo without any sound associated:
-
ACARS CALL (call request from the ground AOC)
-
ACARS MSG (message received from the ground AOC).
(2)
Air/Ground communication warnings Air/Ground communication warnings are generated by the FWCs according to the information provided by the ATSU and the communication peripherals:
-internal ATSU failure
-datalink status (failure or unavailability)
-communication system failure or unavailability.
They are inhibited during some flight phases following priority
level.
(3)
Air/Ground communication limitations Limitations are displayed to the crew to indicate the availability of the communication subnetworks. In case of unavailability, the procedure is to return to VOICE mode.
F. Printer Use
(1) AOC applications
The AOC applications use the services of the printer for the
following purposes:
-print out of received messages (automatic or manually initiated on MCDU)
-MCDU screen hard copies
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initiated on MCDU. If the printer is busy with a previous task, the BUSY indication is displayed on the MCDU scratchpad. No print task can exceed 5 minutes. After this time, the operation is stopped. When the star is removed from the "PRINT*" command, the print function is unavailable. The printer failure (out of paper, printer interruption or failure) is indicated to the crew by the "PRINT FAILED" scratchpad message on the corresponding MCDU pages.
(2) Air/ground communication function The air/ground communication management function uses the services of the printer for the following purposes:
-Automatic print out of a message directed to the printer (label C1)
-MCDU screen hard copy
-Statistics reports
-Audit information
-Company Call message print In the case of ground messages directed to the printer (label C1), the ATSU can reject the uplink message if the printer is unavailable. The UPLINK REJECT message (label Hx) is sent to the ground to indicate that the printer is failed. The PRT MSG PRINT FAIL message is also displayed on the MCDU scratchpad. Even if the printer is busy, the print request is accepted by the ATSU and the ATSU bufferizes the data waiting for the printer availability.
G. RMP Use Each of the three RMPs is an interface device for the VDR3 operation. The frequency range is from 118000 to 136975 KHz by 25 KHz or 8.33KHz steps. Each RMP enables the crew to request a switching of the system (between the RMP and the ATSU) which controls the VDR3 frequency by pressing the transfer pushbutton switch, located between the two windows:
-
When the frequency is displayed in the ACTIVE window of the RMP, the RMP controls the VDR3 frequency., Only the Voice mode is available and the selection of the VDR3 frequency is done through the RMP by displaying the selected frequency in the ACTIVE window.
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