A320飞机维护手册 AMM AUTO FLIGHT 自动飞行4(118)

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 - a text of 30 characters making up the fault message
 displayed on the MCDU.
 2_  The FIDS consolidates the malfunction reports of the various
R  BITEs during the 3rd phase analysis, and generates the various 
R  information which make up the fault messages.
 3_ General principle of the 3rd phase analysis:
 - Update of Failure Witness (FW) 
R  FW allows the FIDS to correlate present faults between two 
R  computers when one has obtained a non-coherent result of 
R  analysis between COM and MON (second phase of analysis).
 This analysis is triggered at each flight phase change.
 When the malfunction is recorded in the FIDS, FW is set to
 1.
 For each malfunction report recorded with FW = 1, the FIDS 
R  in 3rd phase analysis mode interrogates the BITE which sent 
R  the malfunction to know if the malfunction which initiated
 the taking of the snapshot is still present.
 If yes, FW remains at 1, if not FW is set to 0.
 When the source of the malfunction has disappeared, the BITE
 is again authorized to take a new snapshot.
 Reappearance of the malfunction causes transmission of a 
R  malfunction report identical to the one recorded in the 
R  FIDS, and forces relevant FW to 1. 
R  This analysis permits to update the OCCURRENCE OF THE 
R  FAILURE information. 
R  When the failure is not present at last-flight phase change, 
R  the FIDS adds the RTOK (RETEST OK) text at the end of the 
R  message. 
R  At each area change, the FIDS sends a command of triggering 
R  variable re-initialization to the BITEs. In this case, the 
R  failure is dated (UTC
 - Update of Correlation Demand (CD) 
R  CD is a request from dual lane BITE (FAC/FG) emitted when 
R  the second phase result of analysis is not coherent between 
R  COM and MON lanes (symetric fault not seen).
 This analysis is triggered at each reception of a new fault
 report with CD = 1 by the FIDS.
 For a given malfunction report, CD is normally given by the
 2nd phase analysis in the computer and accompanies the error
 code.

 

 For each malfunction report (RA) received with FW = 1 and CD
 = 1, the FIDS, in 3rd phase analysis mode, interrogates its 
R  context table in order to correlate this malfunction report: 
R  . with another malfunction report 
R  . with FW = 1, CD = 0 and indicating same faulty LRU.
 If correlation is possible, CD of RAa changes to 0.
 If correlation is negative, RAa is checked to see if it has
 declared another LRU as faulty under second probability. If
 this is the case, a correlation is made as described above. 
R  If correlation is possible, CD of RAa changes to 0 and the 
R  LRU concerned becomes the first probable cause of failure. 
R  If not, CD remains at 1. 
R  - Update of OF: set when 3rd phase analysis has diagnosed an 
R  internal or external LRU failure. 
R  - Update of CFF and BHF: these items of information are set by 
R  the 3rd phase analysis in accordance with the presence or
 not of at least 1 failure detected by the system on the
 current flight or previous flights.
 - Generation of failure text: 
R  The 3rd phase analysis computes two error codes, CLRU1 and 
R  CLRU2, corresponding to the two LRUs suspected as being the
 origin of the analyzed failure. The codes are planted in
 decreasing failure probability order.
 The final fault message is generated from the LRU code with
 highest failure probability.
 (j) Memorization of failures by FIDS
 For a given failure, the FIDS memorizes the following
 information:
 - NFIDS
 - Fault message
 - RESANA, RESANAC and RESANAM
 - DATE
 - UTC
 - OCCURRENCE OF THE FAILURE
 - FAIL NUMBER (FAIL NO)
 Part of this information is displayed on the MCDU in menu mode. 
R
 (2) Menu Mode
 (a) General
 1 The menu mode is relevant to a specific operation enabled only_
 on the ground. It is based on an interactive dialogue between
 the FIDS and the MCDU.

 

 As the principle of this dialogue is common to all the systems
　
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