-
a internal relays (inside the DMC)
-some software processes implemented in the general application software
These devices allow to cope with:
-
a single DMC failure
-
a dual DMC failure
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a single DU failure
-
a dual DU failure
-
a triple DU failure Furthermore a combination of some of these failures has been taken into account.
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2. Compnent Location
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-------------------------------------------------------------------------------FIN I FUNCTIONAL DESIGNATION I PANELIZONEIACCESS I ATA I I I I DOOR I REF. -------------------------------------------------------------------------------
18WT SEL SW-EIS DMC, 8VU 210 3168 19WT SEL SW-ECAM/ND XFR 8VU 210 3168 9WT1 P/BSW-PFD/ND XFR, CAPT 301VU 211 3168 9WT2 P/BSW-PFD/ND XFR, F/O 500VU 212 3168 1WT1 DMC-1 85VU 127 3162 1WT2 DMC-2 86VU 126 3162 1WT3 DMC-3 85VU 127 3162 6WT CTL PNL-ECAM 11VU 210 3161 2WT1 DU-PFD, CAPT 3VU 211 3161 2WT2 DU-PFD, F/O 5VU 212 3161 4WT1 DU-EWD 4VU 210 3161 4WT2 DU-SD 5VU 212 3161 3WT1 DU-ND, CAPT 3VU 211 3161 3WT2 DU-ND, F/O 5VU 212 3161 7WT1 POT-PFD, CAPT 301VU 211 3168 7WT2 POT-PFD, F/O 500VU 212 3168 8WT1 POT-ND, CAPT 301VU 211 3168 8WT2 POT-ND, F/O 500VU 212 3168
(Ref. Fig. 002)
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3. System Description
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A. Power Supply Reconfiguration
In most cases all the EIS components are supplied with 115VAC/400Hz.
This is the case when one generator only is available, and also when only the APU generator is available. In case of a loss of the main generation, some EIS components are no longer energized. However, some of them are supplied by the emergency network and are still available as follows:
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When the EIS DMC is selected to CAPT DMC3 and the normal supply is not available, the DMC3 is then supplied by the emergency network. The PFD CAPT, the ND CAPT, the EWD is then available.
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When the normal supply for the First Officer is not available, the F/O
PFD, the F/O ND, the SD are not available any more.
(Ref. Fig. 003)
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EIS Switching - Normal/Emergency supply configuration
Figure 003 (SHEET 1)
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EIS Switching - Normal/Emergency supply configuration
Figure 003 (SHEET 2)
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B. DMC Input Sources Reconfiguration
All the input reconfigurations are described in 316200 (interface)
C. DMC Sources Reconfiguration When one DMC fails, the two remaining computers can control the six DUs, provided the crew has selected the DMC3 which stands as a hot spare ready to take over.
(1) Single DMC failure
(a) DMC1 failure
When the DMC1 fails, the message "INVALID DATA" is displayed on the CAPT PFD and ND and a single warning message is activated on the EWD.
The switching is manual. The Captain switches over his EFIS displays to the DMC3 source by means of the EIS DMC selector switch on the switching panel. This selector switch is normally on the NORM position. The pilot selects the CAPT/3 position and the EFIS images are valid again on the CAPT PFD and the CAPT ND.
(b)
DMC2 failure
As for the Captain, the F/O PFD and ND display the message "INVALID DATA". This means that the DMC2 has failed. A single warning message is triggered on the EWD. The First Officer switches over his EFIS displays to the DMC3 source by means of the EIS DMC selector switch on the switching panel. This selector switch is normally on the NORM position. The pilot selects the F/O 3 position and the EFIS images are valid again on the F/O PFD and the F/O ND.
(c)
DMC3 failure
When the DMC3 fails, a single warning message is then displayed
on the EWD to indicate this DMC3 fault. No EFIS or ECAM image is
affected by the DMC3 failure.
The switching to DMC3 is then not possible.
(Ref. Fig. 004)
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(2) Dual DMC failure
(a)
Dual DMC1 + DMC3 failure
If the Captain switches over his EFIS display to the DMC3 source and cannot recover a correct EFIS display, this means that neither the DMC1 nor the DMC3 is available for EFIS display. The First Officer EFIS displays are still available together with the ECAM display: the DMC2 takes over automatically. But the Captain can rely only on the set of standby instruments. 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(151)
