In case of lower ECAM DU failure, the Engine/Warning image remains displayed on the upper ECAM DU, but it is also a single display configuration. The single display configuration is called MONO display configuration (M). More generally, it corresponds to any situation with only one DU for all the ECAM information. The image which is displayed is pratically the same as an Engine/Warning image (minor difference concerning the Advisories, as explained). In case of single display configuration, the E/W image can be temporarily replaced by any A/C system page or by the status page, as long as the corresponding key is maintained pressed on the ECAM control panel. When the pilot releases the key, the E/W image appears again.

 (2)
 ECAM-ND transfer By means of the ECAM/ND XFR selector switch, each pilot can call on his ND an ECAM image (normally A/C system or status image, or Engine/Warning image if both ECAM DUs are inoperative) instead of the ND image. Obviously, the pilots can at any time get their ND image back when they set the selector switch back to NORM.

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 (3) Survey of the various ECAM display configurations The following table gives the various possible ECAM display configurations according to the availability of the ECAM processing channels in the DMCs and the ECAM DUs. The list is not exhaustive.
 -------------------------------------------------------------------------------NR DMC1,2,3 CREW XFR DISPATCHING OF ECAM IMAGES
 COND SELECTION CAPT ND UPPER DU LOWER DU F/O ND -------------------------------------------------------------------------------1 NORM NORM ND E/W (N) S (N) ND
 DMC1 IN E/W DMC2 IN S 2 NORM ECAM/ND F/O ND E/W (N) NIL S (N) DMC1 IN E/W DMC2 IN S 3 NORM ECAM/ND CAPT S (N) NIL E/W (N) ND DMC1 IN S DMC2 IN E/W 4 DMC1 NORM NIL NIL E/W (N) ND FAILED DMC2 IN M 5 DMC2 NORM ND E/W (N) NIL NIL FAILED DMC1 IN M 6 NORM NORM ND DU E/W (N) ND FAILED DMC2 IN M 7 NORM ECAM/ND F/O ND DU E/W (A) S (N) FAILED DMC1 IN E/W DMC2 IN S 8 NORM ECAM/ND CAPT S (N) DU E/W (N) ND FAILED DMC2 IN E/W 9 NORM NORM ND E/W (N) DU ND DMC1 IN M FAILED 10 NORM ECAM/ND F/O ND E/W (N) DU S (N) DMC1 IN E/W FAILED DMC2 IN S 11 NORM ECAM/ND CAPT S (N) E/W (A) DU ND DMC2 IN E/W FAILED 12 NORM ECAM/ND F/O ND DU DU E/W (N) FAILED FAILED DMC2 IN M 13 NORM ECAM/ND CAPT E/W (N) DU DU ND FAILED FAILED
 NOTE : Each DMC ECAM channel can operate in either E/W mode, or S
____ mode, or M (Memo or Single ECAM display mode). N = NORMAL INPUT A = ALTERNATE INPUT
 NOTE : Normally, the DMC which is on the CAPT side always drives the
____ upper ECAM DU and the DMC which is on the F/O side always drives the lower ECAM DU.
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 EIS Relay Boxes - DME AUDIO VOR/ILS Selection Control
 Figure 008

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1 When the ECAM/ND XFR selector switch is set to CAPT, the System (or Status) image is displayed on the CAPT ND, and the Engine/Warning image is displayed on the lower ECAM DU, to inform the crew that this image is generated by the DMC2.

 The management of all the possible ECAM display configurations requires the three DMCs exchanging between them information on their working configuration for ECAM display. To this end, each DMC generates a wired discrete signal: ECAM CHANNEL AVAIL, which signals that its ECAM processor is valid and it is in relation with one valid ECAM DU. Each DMC sends this signal to the two others.
 The DMC in charge of displaying an ECAM image on its related ECAM DU then knows which image to draw: E/W (in Normal or in Single display mode) or System/Status and through which input this image must be sent to the ECAM DU: NORMAL or ALTERNATE. To this end, it sends a wired discrete signal in parallel to the two ECAM DUs (ECAM DU ALTERNATE CONTROL) in the following cases:
 *
 ECAM/ND F/O transfer and DMC 1 ALTERNATE CONTROL demand (such is the case when the upper ECAM DU has failed)

 *
 ECAM/ND CAPT transfer and DMC 2 ALTERNATE CONTROL demand (such is the case when the lower ECAM DU has failed).

 The two ECAM DUs always use their Normal or their Alternate input
 simultaneously.
 (Ref. Fig. 009)

 TABLE: ECAM DISPLAY CONFIGURATIONS
 -------------------------------------------------------------------------------|CASE|DMC1/2/3| CREW | DISPATCHING OF ECAM IMAGES : | | NR |CONDITN |TRANSFER | DU INPUT (N or A) - SOURCE DMC and | | | |SELECTION| ECAM PROCESSOR OPERATING MODE(E/W - S - MONO ) | | | | |------------------------------------------------------| | | | CAPT ND | UP ECAM DU | LO ECAM DU | F/O ND | -------------------------------------------------------------------------------| 1 | NORM | NORM | ND | E/W (N) | S(N) | ND | | | | | |DMC1 in E/W | DMC2 in S | | | 2 | NORM | ECAM/ND | ND | E/W (N) | / | S (N) | | | | F/O | |DMC1 in E/W | (diagonal) | DMC2 in S | | 3 | NORM | ECAM/ND | S (N) | / | E/W (N) | ND | | | | CAPT | DMC1 in S | (diagonal) |DMC2 in E/W | | | 4 | DMC1 | NORM | / | / | E/W (N) | ND | | | FAILED | | (diagonal) | |DMC2 in MONO| | | 5 | DMC2 | NORM | ND | E/W (N) | / | / | | | FAILED | | |DMC1 in MONO| | | | 6 | NORM | NORM | ND | X | E/W (N) | ND |
　
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