-------------------------------------------------------------------------------
| PARAMETER LIST PARAMETER CHARACTERISTICS (NUMERIC) | -------------------------------------------------------------------------------|EQ.SYS.LAB.SDI|PARAMETER | WORD RANGE |UNIT|SIG |BITS|XMSN|CODE|ALPHA|SOURCE | | |DEFINITION| OPER RANGE | |BIT | |INTV| |CODE |ORIGIN | | |(*=REMARK)| RESOLUTION | | | | | | |BUS No.| | |(X=NOTE) | ACCURACY | | | | | | |ATA REF| | | | | | | | | | |CONV | -------------------------------------------------------------------------------| | CNTOR ON | | | | | | | | | | 002 01|AC1/AC ESS| | | | 16 | | | | 13XC | | | CNTOR OFF| | | | | | | | | | 002 10|GEN2 LINE | | | | 14 | | | | 9XU2 | | |CNTOR ON | | | | | | | | | | 002 10|GEN2 LINE | | | | 14 | | | | 9XU2 | | |CNTOR OFF | | | | | | | | | | 002 10| TRANSFER | | | | 15 | | | | 11XU2 | | |CNTOR2 ON | | | | | | | | | | 002 10| TRANSFER | | | | 15 | | | | 11XU2 | | |CNTOR2 OFF| | | | | | | | | | 002 10|AC2/AC ESS| | | | 16 | | | | 14XC | | |CNTOR ON | | | | | | | | | | 002 10|AC2/AC ESS| | | | 16 | | | | 14XC | | |CNTOR OFF | | | | | | | | | | 002 11| APU GEN | | | | 14 | | | | 3XS | | |LINE CNTOR| | | | | | | | | | | ON | | | | | | | | | | 002 11| APU GEN | | | | 14 | | | | 3XS | | |LINE CNTOR| | | | | | | | | | | OFF | | | | | | | | | | 002 11| EXT PWR | | | | 15 | | | | 3XG | | |LINE CNTOR| | | | | | | | | | | ON | | | | | | | | | | 002 11| EXT PWR | | | | 15 | | | | 3XG | | |LINE CNTOR| | | | | | | | | | | OFF | | | | | | | | | | 002 11| GALLEY | | | | 17 | | | | 2XA | | | SHED P/B | | | | | | | | | | | OFF | | | | | | | | | | 002 11| GALLEY | | | | 17 | | | | 2XA | | | SHED P/B | | | | | | | | | | | NOT OFF | | | | | | | | | | 002 11|EMERGENCY | | | | 22 | | | | 23XE | | |GEN TEST | | | | | | | | | | 002 11| NO | | | | 22 | | | | 23XE | | |EMERGENCY | | | | | | | | | | |GEN TEST | | | | | | | | | -------------------------------------------------------------------------------| PARAMETER LIST PARAMETER CHARACTERISTICS (NUMERIC) | -------------------------------------------------------------------------------|EQ.SYS.LAB.SDI|PARAMETER | WORD RANGE |UNIT|SIG |BITS|XMSN|CODE|ALPHA|SOURCE | | |DEFINITION| OPER RANGE | |BIT | |INTV| |CODE |ORIGIN | | |(*=REMARK)| RESOLUTION | | | | | | |BUS No.| | |(X=NOTE) | ACCURACY | | | | | | |ATA REF| | | | | | | | | | |CONV | -------------------------------------------------------------------------------| 004 11| MAIN | | | | 27 | | | | 6XA | | | GALLEY | | | | | | | | | | | SHED | | | | | | | | | | 004 11| NO MAIN | | | | 27 | | | | 6XA | | | GALLEY | | | | | | | | | | | SHED | | | | | | | | | -------------------------------------------------------------------------------

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 (2) BITE communications
 (a)
 Fault detection at system level As an assistance for maintenance tasks, the control units (GCU-1, GCU-2, GCU-APU) have to:

 -collect and analyse the failures, and store the corresponding fault code (hexadecimal) in their own Non Volatile Memory (NVM)
 -run out requested test (ex maintenance test). Each system is fitted with a RS 422 Serial link interface in order: . to transmit the contents of current flight from the NVM and receive test requests and give the results.

 (b)
 GPCU The GPCU transmits the fault messages in clear English to the CFDIU (the CFDIU is connected to the GPCU by a discrete input and an ARINC 429 output bus). It is also the interface between the CFDIU and the various control units (GCU1, GCU2, APU GCU). The control units are connected to the GPCU by RS422 serial data links.

 1 Operation in normal mode
_ The GPCU receives the fault information recorded by the GCU's, compiles them with its own failures and transmits for the whole system a list of the failures in clear language and starting from the most recent. When a failure is identified, the information is permanently transmitted with the ATA

 reference of the LRU or of the faulty circuit up to the
 beginning of the next flight.
 The CFDIU records all the failures - Class I or II and
 internal to the system - transmitted by the GPCU in flight to
 inscribe them in the aircraft LAST LEG REPORT. The most recent
 failure is the first to be displayed on the MCDU.
 2 Operation in menu mode_
 In menu mode, 3 selections are possible: LAST LEG REPORT, TEST
 and CLASS 3 FAULTS. 
R  **ON A/C 401-499, 
R  (2) BITE communications 
R  The GAPCU transmits command and data to and receives data from up to 
R  the two GCUs (GCU 1, 2). 
R  The communication is made via MIL-STD-1553-B link. 
R  The GAPCU is able to read fault data from its own BITE and from the 
R  NVMs in each GCU on the ground or in flight. 
　
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