(2) Fault of the channel
in the event of an internal fault in the channel, the CFDIU immediately presents the CFDS message in the AVIONICS STATUS of the CFDS
**ON A/C ALL
-moreover, on NULL/DC2 transition, the CFDIU memorizes the CFDIU message in the LAST LEG REPORT function of the CFDIU menu (accessible at the end of the flight only) and in the general LAST LEG REPORT of the CFDS. In this case, the time assigned to the fault is the time at which the NULL/DC2 transition occurs.
C. Processing of the General Functions of the CFDS This processing consists in adapting the normal mode of the BITEs. The CFDIU monitors the internal and external fault to:
-memorize the internal faults in the LAST LEG REPORT of the CFDS during the flight phases corresponding to DC2 and DC1
-indicate the presence of internal faults in the AVIONICS STATUS function of the CFDS during the phases corresponding to NULL.
(1) LAST LEG REPORT function of the CFDS The CFDIU uses this function to memorize the internal faults during the flight phases corresponding to DC2 and DC1. Processing of these faults is identical to that of the other faults (correlation with CFDS = source or identifier, transfer in the PREVIOUS LEGS REPORT, etc). In the general case, these faults are detected through permanent monitoring and in some cases, through the power-up test.
(a) Monitoring of the MCDU3 (if installed) The CFDIU memorizes "MCDU3" when it detects label 270 with bit 29 set to 1 (bit status). The CFDIU memorizes "NO MCDU3 DATA" in the event of incorrect reception of this label (label absent or SSM at FW = 11, confirmation over 3 cycles). Rate of label 270: 1 s.
NOTE : The MCDU3 is not monitored under DC1 as it is not power
____
supplied.
1EFF : ALL 1 31-32-00Page B26 1 1 Aug 01/05 1 1 1CES 1 (b) Monitoring of the CFDIU
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through permanent monitoring: The CFDIU memorizes "CFDIU" when it detects an internal fault in the channel.
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through power-up tests
(c) Monitoring of the CLOCK The CFDIU memorizes "CLOCK" when it detects incorrect transmission of label 125 (GMT) or of label 260 (DATE) (label absent, confirmation over 3 cycles).
R **ON A/C 001-049, 051-099, 101-105, 151-154, 201-207,
(2) AVIONICS STATUS function of the CFDS The CFDIU uses this function to indicate in real time the presence (or the absence) of at least one internal fault. i.e.: The CFDIU presents "CFDS" when the normal or back-up channel of the CFDIU is affected by at least one internal fault detected through the permanent monitoring or the power-up test. For faults detected through the permanent monitoring, the "CFDS" message disappears if all faults disappear (in real time). For faults detected through the power-up test, the "CFDS" message disappears if all faults have disappeared when the next power-up occurs.
D. Menu Mode of the CFDIU The menu mode of the CFDIU comprises the following four functions:
-LAST LEG REPORT
-LRU IDENTIFICATION
-POWER UP TEST RESULT
-GROUND SCANNING.
The menu mode is possible with the channel of the CFDIU only.
The menu mode is possible only during the flight phases corresponding to
NULL.
(1) LAST LEG REPORT function The purpose of this function is to memorize the internal or external faults in flight, whether these faults are already present on the ground or not. In the general case, these faults are detected through permanent monitoring and in some cases, through the power-up test.
R 1EFF : ALL 1 31-32-00Page B27 1 1 May 01/05 1 1 1CES 1
(a) Handling of faults
1 Memorization
_
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During the flight phases corresponding to DC1, the CFDIU memorizes the internal and external fault except the MCDU 3 fault (which is not monitored under DC2).
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During the flight phases corresponding to DC2, the CFDIU memorizes the internal faults only.
-The ATA reference, the time at which the failure occurred and the flight phase during which it occurred are associated with each fault message. If an external/internal fault was present on DC2/DC1 transition and is still present, the time associated with this fault is the time of the DC2/DC1 transition. The same applies to the internal faults on NULL/DC2 transition.
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