A.
 Power Supply Reconfiguration

 The power supply system also enables some reconfigurations when some
 supply sources are missing.
 Ref. chap. 24-24-00 for description of busbar reconfigurations.

 B. Source Reconfiguration
 Some sources are reconfigured manually (flight management - air data -inertial reference ), some others are reconfigured automatically (flight guidance - radio altimeter).
 Some input sources are fully redundant (engine sources), whereas some others loss their data when they fail (CFDIU).
 C. Reconfiguration in Case of an EIS Component Failure
 In order to achieve satisfactory redundancy of the system the following principles have been adopted:
 (1)
 A reconfiguration takes place only when:

 -the DMC which drives a display unit is faulty
 -a DU is faulty (or switched off).
 In all cases manual switching has priority over automatic switching.

 (2)
 DMC source reconfiguration

 When one DMC normal source is faulty, the crew select the DMC3 source, manually.
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 EIS -Switching Components
 Figure 002 (SHEET 1)

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 EIS -Switching Components
 Figure 002 (SHEET 2)

R 1EFF : 401-499, 1 31-68-00Page 5 1 1 Config-2 Aug 01/05 1 1 1CES 1 The DMC which drives the CAPT PFD and ND is the DMC1 or the DMC3 according to the selector switch position EIS DMC of the switching panel:

 -
when the EIS DMC selector switch is in the NORM position then, the DMC1 is the data source for the PFD CAPT and the ND CAPT. The DMC2 is the data source for the PFD F/O and the ND F/O.

 When the source supplying the PFD and ND is faulty, the message INVALID DATA is displayed in the middle of the screens, to warn the pilot who changes his data source from DMC1 to DMC3 (Captain's side) or DMC2 to DMC3 (First Officer side).

 -
when the EIS DMC selector switch is in the position CAPT 3 then the DMC3 is the data source for the PFD CAPT and the ND CAPT, replacing the DMC1.

 -
when the EIS DMC selector switch is in the position F/O 3 then, the DMC3 is the data source for the PFD F/O and the ND F/O, replacing the DMC2.

 (3) EFIS REVERSE mode
 In some cases it is necessary to exchange the PFD and the ND. This is
 the EFIS reverse mode.
 Furthermore, a PFD/ND transfer occurs to satisfy priority of the PFD
 over the ND.
 The PFD and ND images are then exchanged.

 The reverse mode takes place when the PFD DU is no more valid but the
 ND DU is still valid.
 The reverse mode can also occur on crew request.
 When a reverse mode occurs automatically, the previous normal mode is
 not automatically recovered if the PFD DU condition turns back to
 normal. But, if the reverse mode is manually (or automatically)
 requested, a new request reverts PFD/ND configuration to normal.

 (4) ECAM source switching
 The ECAM displays normally select the DMC1 (or the DMC3 if manually selected) as a data source, but in the following cases the EWD and SD select the DMC2 (or the DMC3 if manually selected on the F/O side):
 -the DMC1 (or DMC3) is faulty on the Captain's side (the First Officer side being still valid),
 -an ECAM/ND XFR has been selected on the First Officer side and the
 DMC2 (or DMC3) is not faulty. The pilot is aware the DMC source is not valid when the EWD and SD display the message: INVALID DATA in the middle of their screens.
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 (5)
 ECAM REVERSE mode

 In some cases it is necessary to exchange the EWD and the SD. This is the ECAM reverse mode. The ECAM reverse mode occurs automatically when the EWD DU is no more valid but the SD DU is still valid. If the EWD DU becomes valid again, the normal mode is not automatically recovered. It can be manually requested if the pilot switches off the EWD DU and on again, or if he switches the DU to the other DMC.

 (6)
 ECAM/ND transfer This transfer enables to show one of the ECAM displays on one ND DU, on crew request.

 (7)
 ECAM single display mode

 The single display mode occurs when only one DU is available to show both ECAM displays. In the single display mode the EWD is preferably displayed but a system page is available when the crew push the related key on the ECAM control panel. The single display mode takes place automatically when only one DU is available for ECAM function. Then the EWD is displayed in priority on the single DU and the SD is available on request.
　
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