None of the maintenance data normally accessible via the Menu Mode can be read.
R 1EFF : 001-049, 051-099, 101-105, 151-154, 1 31-32-00Page B20 1201-207, 1May 01/05 1 1 1CES 1

 CFDIU - Test Plug Power Supply Figure 056 
R 1EFF : 1 1 1CES  ALL  1 111 31-32-00 Page B21 May 01/04

R **ON A/C 106-149, 155-199, 208-299, 301-399, 401-499,
 (2) Test plugs
 In the event of total CFDIU failure, it is still possible to read the maintenance information sent by certain systems by means of two test plugs located in the avionics compartment, on either side of rack 80VU.
 (a) Characteristics of the test plugs
 -Round plugs
 -Connected to a limited number of systems among the main aircraft systems (located essentially in racks 80VU and 90VU)
 -46 buses are connected (certain systems have two buses connected)
 -The side 1 and 3 systems are connected to plug 1 and side 2 systems are connected to plug 2, which ensures system segregation
 -Directly shunted on the system output buses, without passing through the CFDIU
 -28VDC power supply: Plug 1 on sub-busbar 103PP (C/B 9TW) and
 plug 2 on sub-busbar 204PP (C/B 10TW). (Ref. Fig. 056)
 (b) Operational use of the test plugs
 -On the ground only.
 -
The buses are read by means of an ARINC 429 bus reader.

 -
The only maintenance data that can be read on these buses are the data permanently transmitted by the systems, i.e. the data transmitted in Normal Mode, i.e. internal and external faults that occurred during the last flight.

 None of the maintenance data normally accessible via the Menu Mode can be read.
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 8. CFDS BITE
_________

R **ON A/C 001-049, 051-099, 101-105, 151-154, 201-207,
 A. Constitution of the CFDS - General
 The CFDS as a whole is made up of the following components:

 ---------------------------------------------------------------------------| Components internal to the CFDS | Components external to the CFDS | |-------------------------------------------------------------------------| | - CFDIU (Normal and standby) | - MCDU1 | | | - MCDU2 | | - CLOCK | - PRINTER | | | --| | - MCDU3 (if installed) | - FAC1 | | | | - FDIU | | | | - FWC1 | label encoding the general | | | - FWC2 | parameters used by the | | | - DMC1 | CFDIU | | | - CIDS1 | | | | - AMU | | | | --|
 NOTE : Monitoring of system BITEs (labels 356) constitutes an operational
____ function of the CFDS which is not covered by the CFDIU BITE.
 The CFDIU must therefore monitor the internal and external components described above.
 1EFF : ALL 1 31-32-00Page B23 1 1 May 01/05 1 1 1CES 1R **ON A/C 106-149, 155-199, 208-299, 301-399, 401-499,

 A. Constitution of the CFDS - General
 The CFDS as a whole is made up of the following components:
 ---------------------------------------------------------------------------| Components internal to the CFDS | Components external to the CFDS | |-------------------------------------------------------------------------| | - CFDIU | - MCDU1 | | | - MCDU2 | | - CLOCK | - PRINTER | | | --| | - MCDU3 (if installed) | - FAC1 | | | | - FDIU | | | | - FWC1 | label encoding the general | | | - FWC2 | parameters used by the | | | - DMC1 | CFDIU | | | - CIDS1 | | | | - AMU | | | | __| | |_________________________________|_______________________________________|
 NOTE : Monitoring of system BITEs (labels 356) constitutes an operational
____ function of the CFDS which is not covered by the CFDIU BITE.
 The CFDIU must therefore monitor the internal and external components
 described above.
 **ON A/C ALL
 The faults of the internal components are memorized in the general LAST LEG REPORT of the CFDS and indicated in the A/C CURRENT STATUS.
 1EFF : ALL 1 31-32-00Page B24 1 1 Aug 01/05 1 1 1CES 1 **ON A/C 001-049, 051-099, 101-105, 151-154, 201-207,

 The faults of the internal and external components are memorized in the LAST LEG REPORT or presented in the specific GROUND SCANNING of the CFDIU.
 B. Power-Up Tests of the CFDIU The back-up channel of the CFDIU is tested at each power-up, like the normal channel. Whether there is a fault or not (primary or secondary) in the normal channel, the back-up channel is activated to enable progress of these tests.
 (1) Fault of the back-up channel

R **ON A/C 106-149, 155-199, 208-299, 301-399, 401-499,
 B. Power-Up Tests of the CFDIU
 (1) Not Applicable
 **ON A/C 001-049, 051-099, 101-105, 151-154, 201-207,
 -in the event of an internal fault in the back-up channel, the CFDIU immediately presents the CFDS message in the AVIONICS STATUS of the CFDS
　
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