A320飞机维护手册 AMM 指示/记录系统 7(59)

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 NOTE : The connections between the DMC3 and the DUs are cross-wired
____ for the PFD and ND, in order to cope with a possible wire cut-off concerning the connection which delivers the PFD information. In this case, when the DMC3 supplies the PFD and the ND one side, CAPT or F/O, the DMC3 signals enter the PFD and the ND via their alternate inputs. The activation of the DU alternate inputs and the de-activation of the normal inputs is made by grounding a discrete input on the DU connector. This is achieved by an A/C circuitry which takes into account all the conditions that lead to the change of inputs (normal or alternate).
 (2) Switching and reconfiguration capabilities There are no cross-talk links between the 3 DMCs, in order to ensure complete segregation of CAPT and F/O displays. Inside the DMCs, downstream of the PFD, ND, ECAM channels, there are switching devices for the DSDLs.
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 EFIS - ECAM Reconfiguration Capability
 Figure 045

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1

 ECAM Reconfiguration Between DMC's and Between DUs
 Figure 046

 1EFF : 106-149, 303-399, 1 31-60-00Page 89 1 1 Config-3 Aug 01/05 1 1 1CES 1 These switching devices provide 2 levels of switching. These 2 levels will enable the crew to cope with the operational transfer requirements below in case of failure of a DMC or a DU (or possibly, some failures of EFIS or ECAM controls, FCU and ECAM CP):

 A: DMC transfer: EIS DMC CAPT/3 OR F/O/3 (DMC 3 -----> DMC 1 or 2)
 B: PFD ND transfer
 C: ECAM 1 (upper) DU to ECAM 2 (lower) DU
 D: ECAM ND transfer: ECAM/ND1 or ECAM/ND2 (lower ECAM DU/ND1 or 2)
 (a) DMC transfer In the event of DMC1 (or DMC2) failure, the Captain (or First Officer) can switch over to DMC3. This is controlled by means of the EIS DMC selector switch (CAPT/3 or F/O/3 position). In this case, the DMC3 totally replaces the DMC1 (or 2) through the stage of the output switching relay of the failed DMC. The DMC3 acts as a back up (hot spare). In case of selection of the DMC3, the master DSDL and the feedback DSDL buses are switched in the DMC1 (or 2) output switching stage.
 NOTE : In the event of DMC failure, the DUs driven by this DMC
____ display a diagonal line, which helps the crew in making immediately the right action.
 (b) PFD-ND transfer
 1 PFD failure
_ In case of detected failure of the DU which normally displays the PFD image, there is an automatic PFD-ND transfer. The PFD image is presented on the DU which normally shows an ND image. This transfer is automatically controlled by means of a discrete signal generated by the DMC upon recognition of the failure. This transfer can also be obtained manually by the pilot, by either of the two following means:
 -either deactivate the PFD through its potentiometer set to OFF: this automatically transfers the PFD image on the ND, the ND image is then replaced by the PFD image
 - or press the PFD/ND XFR pushbutton switch, cross-changes the
 images between the PFD and ND. At each action on this pushbutton switch, there is an inversion between the 2 images: the one which was displayed on the left DU is displayed on the right DU and vice versa.
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 2_ ND failure
 In case of failure of the DU which normally shows the ND
 image, the pilot can recover the display of the ND image on
 the remaining DU (which normally shows the PFD image) by means
 of the PFD/ND XFR pushbutton switch.

 (c) ECAM DU failure In the event of upper ECAM DU failure, the Engine/Warning image is displayed on the lower ECAM DU instead of the system page or status message. This switching is automatic: upon reception of the upper DU anomaly signal, through the feedback DSDL bus, the DMC2 ECAM channel processor switches to an ECAM "single display" configuration which privileges the E/W processing. The lower ECAM DU receives the E/W image from the DMC2. The same applies when the UPPER DISPLAY potentiometer is set to OFF. This single display configuration is called: "MONO" display configuration (M). More generally, it corresponds to any situation with only one DU left for all the ECAM information display. Through the ECAM/ND XFR selector switch, the pilots can call the ECAM system image on their ND (in lieu of the ND image). Obviously, the pilots can at any time get their ND image back if the ECAM/ND XFR selector switch is set back to NORM. In the event of lower ECAM DU failure, the same as above applies: the Engine/Warning image remains displayed on the upper ECAM DU, but each pilot can call the ECAM system image on his ND if required by means of the ECAM/ND XFR selector switch. In the event of failure of both upper and lower ECAM DUs, there is no more ECAM image on display. Each pilot can recover the E/W image on his ND, by means of the ECAM/ND XFR selector switch. In this case, the pilot who has the E/W image on his side can temporarily replace it by an A/C system/status image by keeping the related key on the ECAM CP pressed.
　
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