-
A CPU1 board The normal channel interfaces all the aircraft systems connected to the CFDS. These systems are linked directly or via a computer, which acts as a concentrator, to the CFDS. The normal channel ensures all maintenance functions for all aircraft systems connected, as long as this channel is not declared faulty.
D. Characteristics of the Back-up Channel
The back-up channel consists of:
-A power supply unit: -15V, +15V, +5V.
-1 input/output board consisting of two segregated channels
-A CPU2 board The back-up channel constitutes partial normal channel redundancy. It only interfaces a limited number of systems among the main aircraft systems from an operational point of view and it only ensures the SYSTEM REPORT TEST function (and all the system functions accessible from this function). The side 1 systems are connected to channel 1 of the input/output board and side 2 systems are connected to channel 2, thus ensuring system segregation.
E. Switching Logic In normal operation only the normal channel is energized. In the event of fault in this channel, switching to the back-up channel is immediately and automatically performed. In the event of minor fault (input/output boards), automatic switching is not performed; it is only carried out manually on the ground using the MCDU so as not to lose the functions of the main CFDS menu for systems connected to valid input/output boards.
1EFF : ALL 1 31-32-00Page A33 1 1 Aug 01/05 1 1 1CES 1
-Indications: A normal channel fault is indicated by means of a discrete output with the following characteristics: Ground/Open circuit Ground = normal channel operative
-Control: Switching to the back-up channel is ensured by means of an input discrete with the following characteristics: Ground/Open circuit Ground = switching to back-up channel.
R 1EFF : 001-049, 051-099, 101-105, 151-154, 1 31-32-00Page A34 1201-207, 1May 01/05 1 1 1CES 1 7. Operation
_________ The maintenance system operates using the Menus presented on the MCDU. The operator selects the relevant functions or reports in these Menus. There are two types of maintenance report:
-
reports proper to the CFDIU
-
reports proper to the system BITEs.
Furthermore, these reports can be printed, or transmitted to ground.
A.
Functions Proper to the CFDIU
The reports proper to the CFDIU form the main CFDS menu.
On the ground the menu is: (Ref. Fig. 026)
--
LAST LEG REPORT LAST LEG ECAM REPORT PREVIOUS LEGS REPORT AVIONICS STATUS SYSTEM REPORT/TEST POST FLIGHT REPORT ||| ||| In normal operation
--
--
GMT/DATE INIT | | | | Item added in the event of clockfault plus a long power cutoff(> 200 ms)
--
--
BACKUP MODE | | | Item added in the event of CFDIUnormal channel fault
--
--
PFR FILTER PROGRAM | | Filter activationFilter printing
--
R **ON A/C 106-149, 155-199, 208-299, 301-399, 401-499,
7. Operation
_________
The maintenance system operates using the Menus presented on the MCDU. The operator selects the relevant functions or reports in these Menus. There are two types of maintenance report:
-reports proper to the CFDIU
1EFF : ALL 1 31-32-00Page A35 1 1 Aug 01/05 1 1 1CES 1
CFDIU - CFDS Menu on Ground
Figure 026
R 1EFF : 001-049, 051-099, 101-105, 151-154, 1 31-32-00Page A36 1201-207, 1May 01/05 1 1 1CES 1
-
reports proper to the system BITEs.
Furthermore, these reports can be printed, or transmitted to ground.
A.
Functions Proper to the CFDIU The reports proper to the CFDIU form the main CFDS menu.
On the ground the menu is:
(Ref. Fig. 026A)
--
LAST LEG REPORT |
LAST LEG ECAM REPORT |
PREVIOUS LEGS REPORT | In normal operation
AVIONICS STATUS |
SYSTEM REPORT/TEST |
POST FLIGHT REPORT |
--
--
| Item added in the event of clock
GMT/DATE INIT | fault plus a long power cutoff
| (> 200 ms)
|
--
--
PFR FILTER PROGRAM | Filter activation
| Filter printing
--
--
PASSWORD CHANGE | Password modification
--
R **ON A/C 001-049, 051-099, 101-105, 151-154, 201-207, In flight the menu is:
R 1EFF : ALL 1 31-32-00Page A37 1 1 May 01/05 1 1 1CES 1
CFDIU - CFDS Menu on Ground
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