-For the CFDIU:
 *
 Interruption of normal mode, i.e. input scanning and fault memorization.

 *
 Permanent connection to the system selected and establishing a

 dialog between the MCDU and the system. For Type 2 and 3 systems there is a pseudo menu mode, which can be used on the ground only. This mode does not consist of a CFDIU -
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 system dialog, as the operator is guided by the information provided
 by the CFDIU (and not by the system).
 The characteristics of this pseudo menu mode are:

 -Permanent transmission of maintenance information by the system on the system bus to the CFDIU, except for the Test item, where transmission is only temporary. This transmission is described below.
 -Reading by the CFDIU of data corresponding to the menu item
 selected by the operator. This processing is described below. This mode involves:
 -
For the system (BITE): No interruption of normal mode, except in some cases for the Test item of the menu triggered by the discrete.

 -
For the CFDIU:

 *
 interruption of normal mode,

 *
 permanent connection to the system selected,

 *
 presentation by the CFDIU of the system menu,

 *
 reading by the CFDIU of the information transmitted by the systems that correspond to the menu item selected by the operator.

 (a) Operation of Type 1 systems and the CFDIU When the operator selects the required system (on the MCDU):
 -
The CFDIU transmits the identification code of the system selected to its output buses, using label 227 at a rate of 120 ms.

 -
The system BITE transmits the menu contents to the CFDIU once on its output bus. This transmission is made on label 356 at a variable rate depending on the system. However, these data are transmitted in less than 3 s.

 -
The CFDIU displays these data on the MCDU i.e. it reads the messages contained in labels 356 and adapts these messages to the MCDU.

 When the operator selects one of the menu items (except the TEST item):

 -
The CFDIU transmits the code of the line key corresponding to the item selected by the operator to the system; this transmission is made on label 227 at a rate of 120 ms.

 -
The system BITE transmits the maintenance data stored in the different memory zones and corresponding to the selected item (except TEST item) to the CFDIU once on its output bus. This transmission is made on label 356 at a variable rate depending on the system. However, these data are transmitted in less than 3 s. Example: The contents of zone 1, covering the last 63 flights is transmitted by the BITE when PREVIOUS LEGS REPORT is activated by the operator.

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 -
The CFDIU displays these data on the MCDU.
 When the TEST item is selected in the menu:

 -
The CFDIU transmits the code of the line key corresponding to this item (label 227) to the system.

 -
The system BITE executes its test and may transmit a standby message to the CFDIU (label 356).

 -At the end of the test, the BITE transmits the test results (label 356) to the CFDIU once. These data are not stored in the BITE.
 -The CFDIU displays these data on the MCDU.
 (b) Operation of Type 2 systems and the CFDIU When the operator selects the required system: The CFDIU displays the system menu on the MCDU. When one of the menu items is selected (except TEST item):
 -
The CFDIU reads, on the system output bus, the maintenance data permanently transmitted by the BITE, which correspond to the item selected. This transmission is made on label 356 in normal mode, i.e. at a rate set between 50 ms and 250 ms.

 -
The CFDIU displays these data on the MCDU.
 When the TEST item is selected in the menu:

 -
The CFDIU connects the CFDIU-to-the-system discrete to ground for 500 ms.

 -
The system BITE executes its test and may transmit a standby message to the CFDIU (label 356) when the test lasts a long time.

 -At the end of the test, the system BITE transmits the test results on its output bus (label 356) three times consecutively and then restarts transmission of faults in Normal Mode. These data are not stored in the BITE.
 -
The CFDIU reads, on the system output bus, the test results (having previously read the standby messages that may have been sent by the system).

 -
The CFDIU displays these data on the MCDU. In the event of non-reception, (after 3 seconds) the CFDIU displays the following message: NO RESPONSE.
　
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