(Ref. Fig. 005) R **ON A/C 062-099, 106-149, 151-199, 201-299, 301-399, 401-499,
 (Ref. Fig. 005A)
 **ON A/C 103-105,

 (Ref. Fig. 005B)
 **ON A/C ALL

 The MCDUs enable the dialog with these connected systems for the display of their data or for transmitting commands to them.
 Several keys are reserved for using the FMGS which is the system with priority, these keys are described in 22-82-00.
 The MCDU MENU key allows the operator to select one of the systems with which he wants to dialog.
 1EFF : ALL 1 31-32-00Page 13 1 1 Aug 01/05 1 1 1CES 1

 CFDS - Interconnection with the MCDUs
 Figure 005

R 1EFF : 001-049, 051-061, 101-102, 1 31-32-00Page 14 1 1 May 01/05 1 1 1CES 1

 CFDS - Interconnection with the MCDUs
 Figure 005A

R 1EFF : 062-099, 106-149, 151-199, 201-299, 1 31-32-00Page 15 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1

 CFDS - Interconnection with the MCDUs 
R  Figure 005B 
R 1EFF :  103-105,  1  31-32-00 Page 16 
1  1  May 01/05
 1  1
 1CES  1

 The next page key allows the display of a new page when the lenght of the text imposes the use of another page.
 The alphanumerical keys allow the operator to enter data for a particular system.
 The line keys allow the operator to send commands to a particular system.
 As far the CFDS is concerned, it has been seen that the MCDUs allow a dialog with the CFDIU or with the BITEs of the various systems connected to the CFDIU, depending on the flight/ground conditions.
 If MCDU 3 is installed (option), only MCDU 2(3) can be used for maintenance.
 (4) The printer : It is located in the cockpit, on the right section of the center pedestal. The printer is connected to the CFDIU and serves to print reports.
 **ON A/C 001-049, 051-061, 101-105,
 (5) The ACARS
 It is an electronic system located in the avionics compartment.
 Moreover, the ACARS uses the VHF3.
 This system is connected to the CFDIU and serves to send reports to
 the ground.

R **ON A/C 062-099, 106-149, 151-199, 201-299, 301-399, 401-499,
 (5) The ACARS (with ATSU installed):
 It is an electronic system located in the avionics compartment.
 Morever, the ACARS uses VHF3.
 This system is connected to the CFDIU and serves to send reports to
 the ground.

 1EFF : ALL 1 31-32-00Page 17 1 1 Aug 01/05 1 1 1CES 1 **ON A/C ALL

 (6) The DATA LOADER panel The DATA LOADER panel (117VU) is located in the cockpit on the left section of the center pedestal. It is connected to the CFDIU and enables connection of a portable data loader for filter data base uploading.
 B. System BITE Functions
 (1) General
 -Each electrical or electronic system of the aircraft includes a fault detection, isolating and storing device called a BITE
 -A system consists of a set of removable components called LRUs that are specific to the system and that are said to be internal to the system. In many cases, a system uses data from other systems that can be considered as "sensors" and that are said to be LRUs external to the system. Example : In an autopilot, the control unit, the computers which determine the laws and the power systems are internal LRUs. The air data and inertial reference units, the radio altimeter, ... are external LRUs.
 -The BITE system reacts to any fault affecting operation, whether INTERNAL or EXTERNAL to the system.
 -Each LRU is a component internal to a given system and no other. Example : A pressure sensor used for several systems is taken into account as an internal component by one of these systems only.
 -All systems including a BITE system are connected to the CFDIU.
 -
The systems are connected to the CFDIU by means of the system bus. Exceptions : the FMGS via the FAC 1 and the EFCS via the FCDC use specific b uses.

 -
The responsibility for fault detection and isolation lies with the system. The CFDS does not perform any processing and it does not modify the diagnosis made by the system.

 -For complex systems, one of the computers plays the role of system BITE, in other words : it collects the maintenance data from the peripheral computers and it ensures the interface between the computers and the CFDS.
 NOTE : A system BITE is supposed to analyze the data received with a
____ view to establishing a consolidated diagnosis.
　
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