(b)
Dual DMC2 + DMC3 failure
In this case, the F/O PFD and ND are no longer driven and display a message: "INVALID DATA". Since the F/O EFIS displays are not available any more with the EIS DMC selector switch in the F/O 3 position the First Officer rely on the standby instruments while the ECAM display is still available.
(c)
Dual DMC1 + DMC2 failure
In this case the CAPT and F/O EFIS displays are not available. Neither is the ECAM display available. One pilot must place the EIS DMC selector switch to the position CAPT 3, or F/O 3 to have his PFD and ND driven by the DMC3, together with the ECAM display which becomes available again. In the position CAPT 3 the PFD and ND of the First Officer side display the message: INVALID DATA. In the position F/O 3 the PFD and ND of the Captain side display the message: INVALID DATA.
(3) Triple DMC failure
In case of triple DMC failure, the PFDs and NDs are no longer
available. The pilots use the standby indicators:
-
Standby airspeed indicator (401VU)
-
Standby altimeter (401VU) next to the upper display unit
-
Standby horizon
-DDRMI (401VU) next to the lower display unit
-Standby compass (top of the windshield center post)
No ECAM is available.
-Angle of attack indicator (optional).
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EIS - Reconfiguration Controls Figure 004 (SHEET 1)
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EIS - Reconfiguration Controls Figure 004 (SHEET 2)
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D. Reconfiguration in Case of DU Failure
(1) EFIS DU failure
The Captain's PFD/ND XFR pushbutton switch and the First Officer's PFD/ND XFR pushbutton switch enable to exchange the PFD and the ND. This is a manual way to recover one missing EFIS display.
(a)
PFD DU failure
When the PFD DU fails, the PFD is automatically transferred to the ND DU as the DMC swaps its PFD and ND outputs. However there is no automatic switching back when the PFD DU becomes valid again. When the PFD DU is manually switched off, the same display transfer applies. If the pilot needs his ND on the ND DU he can call it back if he pushes the PFD/ND pushbutton switch. This applies to the CAPT or the F/O PFD.
(b)
ND DU failure
When the ND DU fails, the ND can be manually recovered on the PFD DU when the pilot pushes the PFD/ND pushbutton switch.
(2) ECAM DU failure
(a) EWD DU failure
When the EWD DU fails, the EWD is automatically transferred to the SD DU. The same transfer applies when the EWD DU is switched off. In that case only one DU is available to show two ECAM displays. This mode is called the SINGLE DISPLAY mode. If the pilot needs his SD on the SD DU, he must push the related system key on the ECAM control panel. When the key is released, the EWD is displayed again. If the pilot changes the position of the ECAM/ND XFR selector switch, both ECAM displays can be shown:
-
the EWD on the SD DU (automatically)
-
the SD on the ND DU (CAPT or F/O, according to the position of
the ECAM/ND selector switch). To this end, the DMC reverts to the NORMAL mode.
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When the SD DU fails, the EWD DU takes over the presentation of both ECAM displays. As previously described this is the SINGLE DISPLAY mode where an ECAM system page is available on request. The DUAL DISPLAY mode is available when the pilot transfers the SD to his ND DU by means of the ECAM/ND XFR selector switch on the SWITCHING panel. The missing ND can then be called up on the PFD DU by means of the PFD/ND pushbutton switch and exchanged again with the PFD if the PFD/ND pushbutton switch is pushed again. The ND DU presents the ECAM display as long as the ECAM/ND selector switch is in the CAPT or F/O position.
(3) Dual ECAM DU failure
In case both ECAM DUs fail, the pilot can retrieve the EWD and the SD in turn on the ND DU by means of the ECAM/ND XFR selector switch. The mode used is the SINGLE DISPLAY mode as there is only one DU available for the whole ECAM function.
(Ref. Fig. 005, 006, 007, 008, 009, 010, 011, 012, 013)
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EIS Links - NORMAL Configuration
Figure 005
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EIS Links - DMC3 replacing DMC1 Configuration
Figure 006
R 1EFF : 401-499, 1 31-68-00Page 19 1 1 Config-2 Aug 01/05 1 1 1CES 1 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM 指示/记录系统 8(152)
