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R  * peripheral not linked to FIDS, monitored through corresponding 
R  computer: FCU (FG), MCDU (FM) 
R  * FIDS which is monitored by the AFS computers (FAC/FG) and CFDS. 
R
 C. FIDS operation
 The system has two fault detection and isolation modes:
 - Normal mode (flight) :
 The system stores the failure data relevant to the AFS in non-volatile
 memories and transmits these data to the CFDIU. 
R  - Menu mode (ground):
 The system transmits a menu to the MCDU via the CFDIU. 
R
 (1) Normal mode
 In normal mode, the AFS maintenance system ensures the following
 functions:
 - fault detection 
R  The fault is detected at the level of each computer BITE by 
R  constant monitoring of specific variables of the operational 
R  software.
 - fault isolation
 The detection of a fault triggers an analytic process. This process
 identifies the LRU from which the fault originates. This analysis
 is performed in two steps:
 1st step: A first analysis is made at the level of the computer
 which detected the fault.
 This first step can itself be split into two phases at FAC and FG
 level (1st and 2nd phase analysis).
 2nd step: A second analysis is made at FIDS level. This analysis is
 called the 3rd phase analysis.
 - Storage of faults in the non-volatile memories. 
R  The breakdown of these functions is shown on figures: 
R  (Ref. Fig. 003, 004)
 To perform the functions described above, the system consecutively
 performs the following operations:
 - Interpretation and execution of the CFDIU commands by the FIDS.

 

R  Fault Detection - 1st and 2nd Phase Analysis Figure 003
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R  3rd Phase Analysis (Update of CD) Figure 004
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 - Interpretation and execution of the FIDS commands by the FAC, FG
 and FM BITEs.
 - Fault detection at the level of each AFS BITE.
 - Transmission of maintenance data by the FCU BITE to the FG and by
 the MCDU BITE to the FM.
 - Fault isolation, creation of fault contexts and memorization of
 these contexts by the FAC, FG and FM BITEs.
 - Transmission of the malfunction reports of the BITEs to the FIDS.
 - Management and consolidation of the malfunction reports by the
 FIDS.
 - Generation of a fault message from this consolidated diagnosis,
 which is sent to the CFDIU.
 - Memorization of faults by the FIDS.
 (a) Interpretation and execution of the CFDIU commands by the FIDS
 1 The FIDS card, connected to the CFDIU in acquisition, receives_
 from the CFDIU:
 - A control word
 - Various information:
 * DATE
 * UTC (Universal Time Coordinated)
 * Aircraft identification
 * Flight phase 
R 
R  2 Use of DATE, UTC and AIRCRAFT IDENTIFICATION and FLIGHT PHASE_ 
R  informations. These informations are received by the FIDS from 
R  the CFDIU. 
R  NOTE : If the DATE and UTC informations are not available, the____ 
R  FIDS will send out for these datas: 
R  - DATE: /3F 
R  - UTC: 3FHFF 
R  - The DATE and UTC informations are transmitted by the FIDS to 
R  the FAC, FG and FM BITES in order to enhance their fault 
R  contexts. 
R  - The AIRCRAFT IDENTIFICATION information is used by the FIDS 
R  for the LRU IDENTIFICATION option (Ref. Menu Mode) 
R  - The FLIGHT PHASE information is used at two levels: 
R  * It is transmitted to the FAC, FG and FM BITEs by means of 
R  the command. These BITEs use this information to manage the 
R  memory areas where the fault contexts are stored (ground 
R  area, flight area).

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R  * It is used by the FIDS which, during detection of flight 
R  phase change, activates a consolidation process for the 
R  fault diagnosis sent by the BITEs (Ref. 3rd phase analysis). 
R  3_  Emergency operation in case of CFDIU failure or absence
　
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