-
FMGC 1-A bus if no AP is engaged or if AP1 is engaged alone or if the two APs are engaged (DUAL)
-
FMGC 2-A bus if AP2 is engaged alone, or if the FD2 orders are displayed (and the AP 1 is not engaged), which is the case when an automatic switching to the FD 2 has occurred.
The same applies to the DMCs working on side 2, replacing in the text
FMGC 1 with FMGC 2 and vice-versa.
If the two FMGC A buses are invalid, at each cycle the DMC checks
through the FMGC 1 and 2 A buses until finding a valid one.
Meanwhile, the FD red message is displayed on the PFDs and the FMA is
blanked.
(5) FMGC EIS bus (Flight Management) Each DMC receives the FMGC 1 and 2 EIS buses. The DMCs which operate on side 1 work with FMGC 1 data, and the DMCs which operate on side 2 use the FMGC 2 data. If one FMGC EIS bus is no longer valid, the DMC which normally uses its data automatically switches over to the EIS bus of the other FMGC. If the EIS bus of the first FMGC is again valid, the DMC reverts to it, but only after an action on the ND mode or scale selector switch of the FCU. If the two EIS buses are not valid, the DMC permanently switches from one to the other until finding a valid one. Meanwhile, the amber message MAP NOT AVAIL is displayed on the NDs (if they are in ROSE/NAV or ARC or PLAN modes).
(a) The table below gives the bus selection logic concerning the FMGC EIS buses :
-------------------------------------------------------------------------------| FMGC 1 EIS | FMGC 2 EIS | DMC | DMC | | VALID | VALID | SIDE 1 | SIDE 2 | |--------------|--------------|-----------------------|-----------------------| | Y | Y | FMGC 1 | FMGC 2 | |--------------|--------------|-----------------------|-----------------------| | Y | N | FMGC 1 | FMGC 1 | | | | | (message FMC 1 on F/O | | | | | ND) | |--------------|--------------|-----------------------|-----------------------| | N | Y | FMGC 2 | FMGC 2 | | | | (message FMC 2 on CAPT| |
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 31-68-00Page 35 1201-299, 301-302, 1Config-1 May 01/05 1 1 1CES 1
-------------------------------------------------------------------------------
| FMGC 1 EIS | FMGC 2 EIS | DMC | DMC | | VALID | VALID | SIDE 1 | SIDE 2 | |--------------|--------------|-----------------------|-----------------------| | | | ND) | | |--------------|--------------|-----------------------|-----------------------| | N | N | FMGC 1 <-------> FMGC 2 | | | | Permanent switching until finding one valid | | | | FMGC. Meanwhile, MAP NOT AVAIL message on the | | | | NDs | | -------------------------------------------------------------------------------
(b) FMGC 1 or FMGC 2 EIS bus validity
R **ON A/C 001-049, 101-105, 151-199, 201-299, 301-302,
(Ref. Fig. 011)
R **ON A/C 051-099,
R (Ref. Fig. 011A)
R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
A given FMGC EIS bus is considered as valid if : - the corresponding FMGC HEALTHY discrete signal assumes the valid state - and the EIS bus itself is recognized as valid.
NOTE : A given FMGC (eg 1) is normally always working in the ND____ mode and in the range which are selected on the corresponding EFIS control section of the FCU.
NOTE : If a given FMGC EIS bus is invalid (FMGC failure or EIS____ bus not valid), the DMC normally using its parameters automatically switches over to the opposite FMGC EIS bus. In this case, a SELECT OFFSIDE RANGE amber message pulses on the corresponding ND for 10 s. Since an FMGC cannot produce 2 different ND images scaled on different ranges, the pilot who has lost his onside FMC should select the same range as the other pilot whose FMC is still operating, in order to have identity between the range markers presented on his ND and those selected on his EFIS control section.
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 31-68-00Page 36 1201-299, 301-302, 1Config-1 May 01/05 1 1 1CES 1
FMGC - EIS Bus/DMC Interface
Figure 011
R 1EFF : 001-049, 101-105, 151-199, 201-299, 1 31-68-00Page 37/38 1301-302, 1Config-1 May 01/05 1 1 1CES R FMGC - EIS Bus/DMC Interface R Figure 011A
R 1EFF : 051-099, 1 31-68-00Page 39/40 1 1 Config-1 May 01/05 1 1 1CES
NOTE : If an FMGC receives no mode control and range selection____ (FCU failure for instance), it automatically produces an 80 NM indication on the ND.
(6) FCU buses The FCU groups together all AFS and EIS selections and mode controls. The FCU is a dual unit, fully redundant with 2 processors 1 and 2. Normally, the processor 1 operates, and the processor 2 is a hot spare. The FCU issues 4 ARINC 429 low speed buses : 1-A, 1-B, 2-A, 2-B.
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