*
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)
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NOTE : An internal fault is an internal fault transmitted____ by a system BITE or a fault internal to the CFDIU 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.
NOTE : All messages identified by ATA reference 462XXX will____ be correlated with messages identified by ATA reference 232XXX.
**ON A/C ALL
- Transmission to the ACARS (if installed) The identifiers are sent to the ACARS together with the fault message, in real time. They are also transmitted on transmission of the complete POST FLIGHT REPORT.
R R R e_ The CFDIU establishes the PREVIOUS LEGS REPORT. - Memorization of maintenance information. The CFDIU transfers and stores the complete LAST LEG REPORT in the PREVIOUS LEGS REPORT at DC1/NULL transition. The CFDIU can memorize up to 200 fault data over 63 flights. The faults prior to the last 63 flights are deleted. Only flights with at least one fault appear in the PREVIOUS LEGS REPORT. - Flight leg identification. The CFDIU associates the data below with the maintenance information so that maintenance personnel can clearly identify the flight concerned:
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R 1 1
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1 1 May 01/04 1 1 1CES 1 . The flight count (generated by the CFDIU). LEG -00 coresponds to the last flight. It is identical to the LAST LEG REPORT. Example : LEG -13 . The flight date (emitted by the CLOCK or generated by the CFDIU, using label 260). . Aircraft identification (emitted by the FDIU using labels 301, 302, 303 and 304).
-The CITY PAIR (FROM TO) (emitted by the FMS using labels 040, 041 and 042 transmitted by the FAC) used by the printer only.
2 On the ground
_ At each scrutinization of a system input, the CFDIU monitors refreshment of the fault information transmitted on the bus (see description in flight) ; it does not memorize a fault message. This monitoring is only used for determining the status of aircraft systems at any moment and for establishing the AVIONICS STATUS.
(2) Menu Mode (Type 1 systems) and pseudo menu mode (Type 2 and 3 systems) The menu mode concerns a specific operation that is only possible on the ground for Type 1 systems (ARINC input and output). This mode is based on an interactive dialog between an aircraft system (Type 1) and the MCDU, the operator being guided by the information provided by the system itself. Menu mode can only be connected to one system and one MCDU at a time. The characteristics of menu mode are a selective transmission of data (depending on the operators selection) on the bus between the MCDU and the system, the CFDIU serving as interface. This transmission is described below. This mode involves:
-For the system (BITE):
*
Interruption of normal mode, i.e. detection, memorization and transmission of faults.
*
Display of its menu and execution of the menu functions, when ordered from the MCDU (via the CFDIU).
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