-
the electrical routings are separate.

 -
the pin connections at the output connectors are duplicated and separate.
 At software level, the programming languages of the command and monitoring
 channels are different.
 For the GUIDANCE function, the engage logic of the AP, FD and A/THR systems
 in command and monitoring channels is achieved in hard-wired circuitry.

 **ON A/C ALL
 2. Component Location
__________________
 (Ref. Fig. 003)

 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
 -------------------------------------------------------------------------------1CA1 FMGC-1 83VU 122 824 22-83-34 1CA2 FMGC-2 84VU 128 824 22-83-34
 3. System Description
__________________

R **ON A/C 001-049, 051-061, 101-105,
 A. Command Channel
 (Ref. Fig. 004)

 (1) Flight management This digital section comprises three processors, each one being located on one board.
 (a)
 Input/output processor (input/output board) It ensures the functions below:

 -ARINC interface with specific peripherals (MCDUs, data loader, EFIS, FMS Intersystem bus, printer/ACARS).
 -dialogue with the other two processors through a common memory located on the same board.

 (b)
 Data base processor (data base board) The data bank is located on the same board in the mass memory. This board includes a memory module. This processor manages the data bank and certain background tasks which are not performed by the main processor.

 1EFF : ALL 1 22-83-00Page 6 1 1 May 01/05 1 1 1CES 1

 FMGC - Component Location Figure 003 
R 1EFF : 1 1 1CES  ALL  1 111 22-83-00 Page 7 May 01/03

 FMGC - Architecture
 Figure 004

 It dialogues with the other two processors through the common
 memory and with the FG part through a shared memory located on
 the board.
 The common memory is supplied with 5V from a battery.
 It is therefore maintained in the event of aircraft power cutoff
 (Ref. para. (3)).

 (c) The FM CPU board fulfills the flight management tasks. The board is equipped with a memory module. It also includes the shared memory for dialogue with the FG part. Upon energization a test program is activated if the aircraft is on the ground.
 (2) Guidance function
 (a) Digital part This part uses two processors : the INNER LOOP processor and the GUIDANCE COMMAND processor. The dialogue between the two processors is performed through a shared memory. The correct running of the program is checked by a watchdog. The result is directly taken into account in the system engagement hardwired logic on the EXTENSION COM board. Safety tests are activated at power-up when the aircraft is on the ground. The guidance part, command channel, is integrated on three boards:
 -
a ILCPU (Inner Loop CPU)

 -
a CPU AFS

 -an EXTENSION COM
 1 ILCPU board
_ This board which includes the INNER LOOP processor is equipped with a memory module. It ensures the following functions:
 -ARINC acquisition of the peripherals for the INNER LOOP processor and transmission to the GUIDANCE processor.
 -transmission of data to the peripherals by means of two ARINC buses : bus A (high speed) and bus B (low speed). These buses are looped back on the GUIDANCE MONITOR for monitoring purposes.
 -computation of the AP, FD and A/THR inner loops control laws and vote of the AP signals between the command and monitoring channels
 -monitoring through comparison of the AP signals between the two channels.

 2 The GUIDANCE part is integrated in the other two boards in the
_
 command channel.
 The CPU AFS board includes a memory module.
 The GUIDANCE part ensures the functions below:

 -ARINC acquisition for the Flight Management (FM) and guidance functions either directly or through the INNER LOOP board
 -dialogue with the FM part
 -
computation of the operational logic

 -
computation of the AP, FD and A/THR outer loop signals and transmission of these signals to the INNER LOOP processor

 -transmission of the flight management parameters on the ARINC bus C
 -monitoring of the alpha floor detection
 (b) Hardwired logic It is integrated in the EXTENSION COM board. It ensures the functions below:
　
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