C. The Interface Unit : the CFDIU
 (1)
 General The CFDIU is a computer that is used as the interface between the system BITEs and the MCDUs.

 (2)
 CFDIU operating principles The CFDIU permanently generates maintenance phases NULL/DC2/DC1 from external data. The CFDIU permanently memorizes in real time (to within a few seconds) the maintenance messages from the system BITEs. The maintenance messages memorized by the CFDIU concern the internal faults detected during the current or last flight. The CFDIU monitors all its inputs from BITEs (monitoring of the non-refreshment of buses and the state of the discretes) and memorizes a fault message in the event of non-validity of an input. The CFDIU permanently memorizes in real time the ECAM warnings presented to the crew during the current or the last flight. The CFDIU associates the occurrence flight phase and the occurence time (hours and minutes) with each fault memorized. The CFDIU associates the occurrence time (hours and minutes) and the flight phase with each warning message memorized. The CFDIU correlates each internal fault memorized with all external faults which may be a consequence of the internal fault. The CFDIU permanently monitors and memorizes the status of the systems, in other words correct or faulty operation (using fault data transmitted by the systems or the non-refreshment of inputs). The CFDIU establishes a fault history of the last 64 flights giving the flight counter number and the date for each flight. The CFDIU operates in 2 modes, Normal Mode and Menu Mode.

 D. The Complete System : CFDS Operating principles The CFDS (BITE + CFDIU) is characterized by two operating modes : Normal Mode and Menu Mode.
 (1) Normal Mode Normal Mode characterizes the permanent and systematic operation in flight and on the ground of all the systems and of the CFDIU. This mode is based on the permanent memorization in real time of fault data. This memorization takes place at 2 levels : system and CFDIU.
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 The characteristics of Normal Mode are the following :
 -Memorization at aircraft systems level : All the systems connected to the CFDIU (types 1 and 2) memorize fault data concerning the system in the system BITE non-volatile memories. The nature of these data depends on the flight phases and on the systems; it is described below.
 -These maintenance data are transmitted by the system to the CFDIU. The nature of these data concerns the last flight and depends on the system; it is described below.
 -Memorization at the CFDIU level : The CFDIU memorizes the maintenance data concerning all the aircraft systems in non-volatile memories. The nature of the data memorized by the CFDIU concerns internal or external faults of systems.
 This mode involves :
 -
For the systems (BITE) : . Permanent monitoring, detection and isolation of faults . the storage in memory of maintenance data . the permanent transmission to the CFDIU of the last flight fault messages.

 -
For the CFDIU : . Reading by scanning of all the buses coming from the systems . selection and memorization of corresponding messages.

 (a) Operation of Type 1 systems
 **ON A/C 001-049, 051-099, 101-105, 151-154, 201-207,
 (Ref. Fig. 007)
R **ON A/C 106-149, 155-199, 208-299, 301-399, 401-499,
 (Ref. Fig. 007A)
 **ON A/C 001-049, 051-099, 101-105, 151-154, 201-207,
 (Ref. Fig. 008)
R **ON A/C 106-149, 155-199, 208-299, 301-399, 401-499,
 (Ref. Fig. 008A)
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 CFDIU - Fault Storage "at the latest" in System BITE
 and Transmission to the CFDIU : Normal Mode/Type 1 Systems
 Figure 007

R 1EFF : 001-049, 051-099, 101-105, 151-154, 1 31-32-00Page 27 1201-207, 1May 01/05 1 1 1CES 1

 CFDIU - Fault Storage "at the latest" in System BITE and Transmission to the CFDIU: Normal Mode/Type 1 Systems Figure 007A
R 1EFF : 106-149, 155-199, 208-299, 301-399, 1 31-32-00Page 28 1401-499, 1Aug 01/05 1 1 1CES 1

 CFDIU - Fault Storage "at the soonest" in System BITE and Transmission to the CFDIU : Normal Mode/Type 1 Systems Figure 008
R 1EFF : 001-049, 051-099, 101-105, 151-154, 1 31-32-00Page 29 1201-207, 1May 01/05 1 1 1CES 1

 INTENTIONALLY BLANK

R 1 1
31-32-00Page 30
1 1 May 01/04 1 1 1CES 1

 CFDIU - Fault Storage "at the soonest" in System BITE and transmission to the CFDIU: Normal Mode/Type 1 Systems Figure 008A
R 1EFF : 106-149, 155-199, 208-299, 301-399, 1 31-32-00Page 31 1401-499, 1Aug 01/05 1 1 1CES 1 1EFF : ALL 1 31-32-00Page 32 1 1 Feb 01/01 1 1 1CES 1 class 1 or 2) during the current or last flight (part of zone 1). This transmission is made on label 356 at a fixed rate of between 50 ms and 250 ms depending on the system. The flight and ground memories are never erased on the aircraft. The part of the flight memory transmitted to the CFDIU is erased at each ground to flight transition (but it remains stored in the other parts of the memory).
　
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