N different from 1, 2 or 3
N different from 1, 2 or 3
N different from 0, 2 or 3
N different from 2, 3, 4 or 5
N different from 2, 3 or 6
N different from 1 or 9
N different from 5, 6 or 7
N different from 1, 2 or 8
N different from 1, 2, 3 or 5
N different from 5
+
23-13
+
22-83
letters
. Application window
the application window of this criterion is:
* Under DC1
R 1EFF : 001-049, 051-099, 101-105, 151-154, 1 31-32-00Page 46 1201-207, 1May 01/05 1 1 1CES 1 3 complete cycles of scanning of the input ports, the cycles being counted from the input port on which correlation processing was initiated or 1 minute from the fault which initiated correlation processing if duration of the 3 scanning cycles is less than 1 minute (to enable systems to transmit their faults).
* Under DC2 The period between detection of the internal fault which initiated a correlation processing and DC2/DC1 transition plus 1 minute (as systems transmit the external faults at DC2/DC1 transition only).
-General rules of correlation processing The starting point of fault correlation is an aircraft event. Depending on fault confirmation time of each system and according to scanning principle of the CFDIU this aircraft event is detected in the CFDIU through reception of internal fault(s) or external fault(s), although it is not possible to know whether the internal failure will precede or follow the external fault.
*
Rule No. 1 : Any fault (internal or external and with any ATA reference) which occurs outside the duration of the correlation processing of a previous fault (internal or external and with any ATA reference) is considered as a new fault and initiates a new correlation processing.
*
Rule No.2 : Any fault (internal or external) which occurs during the correlation processing of one or several previous faults (internal or external) is considered differently, depending on its ATA reference: . First case : the ATA reference of the fault is nearly the same that of one or several faults under processing :the fault is not considered as a new fault and is correlated with these faults under processing. . Second case : the ATA reference of the fault is different from that of all faults under processing : the fault is considered as a new fault and initiates a new correlation processing (processing of the other faults is not interrupted).
-Description of the fault correlation processing (Ref. Fig. 013)
NOTE : An internal fault is an internal fault transmitted
____ by a system BITE or a fault internal to the CFDIU
R 1EFF : 001-049, 051-099, 101-105, 151-154, 1 31-32-00Page 47 1201-207, 1May 01/05 1 1 1CES 1 BITE (CFDIU/CLOCK/MCDU3). An external fault is an external fault transmitted by a system BITE or a non-refreshment of label 356 detected by the CFDIU. For faults internal to the CFDIU BITE or external faults (non-refreshment of label 356), the source/identifier of the fault is CFDS.
NOTE : A given system can be source/identifier only once.
____ Particularly, if several external faults are transmitted by a given system during a correlation processing, this system is mentioned as identifier only once.
NOTE : - For a given fault, the number of identifiers is
____ limited to 6 (1 page).
-For the totality of faults occurred in flight the number of identifiers is limited to 200.
NOTE : The number of simultaneous correlation processings
____ is limited to 8. If a 9th fault occurs, the processing of the first fault is arbitrarily stopped.
R **ON A/C 106-149, 155-199, 208-299, 301-399, 401-499,
(d) CFDIU operation
(Ref. Fig. 010A)
(Ref. Fig. 011A)
The CFDIU carries out a permanent scan of inputs from each system connected (Type 1, 2 or 3), in flight and on the ground.
However, CFDIU processing is not the same depending on whether it is performed on the ground or in flight.
1 In flight : (maintenance phases corresponding to DC2 or DC1)
_
-
"at the soonest" for Type 1 and 3 systems - phases 2 b thru 9 a.
-
"at the latest" for Type 1 and 3 systems - phases 4 thru 9 a
For Type 2 systems - phases 5 a thru 7a.
1EFF : ALL 1 31-32-00Page 48 1 1 Aug 01/05 1 1 1CES 1
CFDIU - Description of the Fault Correlation Processing
Figure 013
1EFF : ALL 1 31-32-00Page 49/50 1 1 Feb 01/01R 1 1 1CES
a
_
The CFDIU establishes the CURRENT/LAST LEG REPORT.
At each scrutinization of a system input (bus or discrete), the CFDIU:
-Monitors refreshment of information transmitted on the buses on each of the ARINC 429 input ports (except those which are excluded by pin programming). Non-refreshment detection is carried out by monitoring label 356 which is permanently transmitted by the subscriber systems. Non-refreshment is confirmed in 4 seconds.
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