A. ARINC 429 Buses
(1) ADIRU-IR buses The DMC 1, 2 and 3 select for display the IR data from the ADIRU 1, 2 or 3 according to the logic given in the table below:
-------------------------------------------------------------------------------|EIS DMC SELEC-|ATT/HDG SELEC-| DMC 1 | DMC 2 | DMC 3 | | TOR SWITCH | TOR SWITCH | | | | |--------------|--------------|---------------|---------------|---------------| | NORM | NORM | IRS 1 | IRS 2 | IRS 1 | | NORM | CAPT/3 | IRS 3 | IRS 2 | IRS 3 | | NORM | F/O/3 | IRS 1 | IRS 3 | IRS 1 | | CAPT/3 | NORM | IRS 1 | IRS 2 | IRS 1 | | CAPT/3 | CAPT/3 | IRS 3 | IRS 2 | IRS 3 | | CAPT/3 | F/O/3 | IRS 1 | IRS 3 | IRS 1 | | F/O/3 | NORM | IRS 1 | IRS 2 | IRS 2 | | F/O/3 | CAPT/3 | IRS 3 | IRS 2 | IRS 2 | | F/O/3 | F/O/3 | IRS 1 | IRS 3 | IRS 3 | -------------------------------------------------------------------------------
Note that the DMCs do not perform the automatic selection of another IR bus if the one normally used is no longer valid. It is up to the pilot to perform manual selection to another valid IR sensor. Normally, the EIS DMC and/or ATT/HDG manual reconfiguration selections are made only when a DMC 1 or 2 and/or an ADIRU 1 or 2 are faulty. However, they can be made also when those items of equipment operate properly. In that case the DMCs select the IR according to the logic given in the above table.
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 31-68-00Page 33 1201-299, 301-302, 1Config-1 May 01/05 1 1 1CES 1
(2)
ADIRU-ADR buses The ADIRU ADR bus selection inside the DMCs follows exactly the same rules as the IR bus selection. Note that the IR and ADR manual reconfiguration selections are completely independent.
(3)
FAC buses Each DMC receives the FAC 1 and 2 buses. The FAC 1 or FAC 2 bus selection inside each DMC is automatic according to the logic given in the table below:
-------------------------------------------------------------------------------| FAC 1 | FAC 2 | DMC | DMC | | VALID | VALID | SIDE 1 | SIDE 2 | |-------|-------|------------------------------|------------------------------| | Y | Y | FAC 1 | FAC 2 | |-------|-------|------------------------------|------------------------------| | Y | N | FAC 1 | FAC 1 (*) | | | | | (message on ECAM) | |-------|-------|------------------------------|------------------------------| | N | Y | FAC 2 (*) | FAC 2 | | | | (message on ECAM) | | |-------|-------|------------------------------|------------------------------| | N | N | FAC 1 <----> FAC 2 | | | | | permanent switching until | | | | | finding one valid FAC. | | | | | Meanwhile, SPD LIM red | | | | | message on CAPT PFD | | -------------------------------------------------------------------------------(*) : Abnormal configuration. When a DMC works with an offside FAC and if
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, and 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 working 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.
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 31-68-00Page 34 1201-299, 301-302, 1Config-1 May 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 :
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