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 its onside FAC becomes valid again, the DMC works again with it.
 Note that a given FAC is considered as being invalid if its output bus is faulty (parameter not refreshed or in the F/W state), or if the FAC HEALTHY wired discrete signal is in the open circuit state.
 (4) FMGC A bus (Guidance) Each DMC receives and processes both FMGC 1 and 2 A buses. It uses them (either one or two) independently for the display of the flight director orders and the flight mode annunciations, according to the engagement status of the FDs and the APs. Display of the FD or FPD orders : The DMCs which work on side 1 use the FMGC 1-A bus for the display of the FD orders. If FD 1 fails, or if the FMGC 1-A bus is no longer valid, there is an automatic switching and the DMC uses the FMGC 2-A bus for the display of the FD orders.
 1EFF : 106-149, 303-399, 1 31-68-00Page 31 1 1 Config-3 Aug 01/05 1 1 1CES 1 NOTE : FD orders means : FD bars (pitch, roll, yaw) or FPD orders

____ related to the Flight Path Vector in TK-FPA mode.
 Display of the flight mode annunciations :
 As regards the FMA, which displays the armed and active modes for the
 FD, the AP and the A/THR, the DMCs which work on side 1 use:

 -
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 which work 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 a valid one is found.
 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 If one FMGC EIS bus is no longer valid, the DMC which normally uses its data automatically switches over to the EIS bus of the other FMGC.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 a valid one is found. 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| |
 1EFF : 106-149, 303-399, 1 31-68-00Page 32 1 1 Config-3 Aug 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 one valid FMGC is | | | | found. Meanwhile, MAP NOT AVAIL message on | | | | the NDs. | -------------------------------------------------------------------------------

(b) FMGC 1 or FMGC 2 EIS bus validity (Ref. Fig. 011) 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) normally always works 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 which normally uses 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 still operates, in order to have identity between the range markers presented on his ND and those selected on his EFIS control section.
　
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