- MCDU-1 (3CA1)

 - wiring of the MCDU OWN OUT bus from the FMGC 1 (1CA1) to the MCDU 1 (3CA1)

 - wiring of the FMGC HLTY discrete from the FMGC 1 (1CA1) to the MCDU 1 (3CA1)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 22-70-00-710-001 Operational Test of the Multipurpose Control and
 Display Unit (MCDU)
 AMM 22-82-12-000-001 Removal of the MCDU (3CA1,3CA2,3CA3)
 AMM 22-82-12-400-002 Installation of the MCDU (3CA1,3CA2,3CA3)
 AMM 22-83-34-000-001 Removal of the FMGC (1CA1,1CA2)
 AMM 22-83-34-400-001 Installation of the FMGC (1CA1,1CA2)
 ASM 22-85/04
 ASM 22-86/04

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the Multipurpose Control and Display Unit (MCDU 1) (Ref. AMM TASK 22-70-00-710-001).
 4. Fault Isolation
_______________
 A. If the A/C status page does not come into view:
 - replace the FMGC-1 (1CA1) (Ref. AMM TASK 22-83-34-000-001) and (Ref. AMM TASK 22-83-34-400-001).
 (1) If the fault continues:

 - replace the MCDU-1 (3CA1) (Ref. AMM TASK 22-82-12-000-001) and (Ref. AMM TASK 22-82-12-400-002).

 (2) If the fault continues:

 - do a check of the wiring of the MCDU OWN OUT bus from the FMGC 1 (1CA1) to the MCDU 1 (3CA1) (Ref. ASM 22-86/04).
 (a) If there is no continuity:
 - repair the above wiring.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞22-82-00∞∞∞∞∞∞∞∞∞∞Page 215
 Feb 01/98 CES (b) If there is continuity:

 - do a check and repair the wiring of the FMGC HLTY discrete from the FMGC 1 (1CA1) to the MCDU 1 (3CA1) (Ref. ASM 22-85/04).
 B. Do the test given in Para. 3.

 Loss of Communication with the FMGC 2 through the MCDU 2
 1. Possible Causes
_______________
 - FMGC-2 (1CA2)

 - MCDU-2 (3CA2)

 - wiring of the MCDU OWN OUT bus from the FMGC 2 (1CA2) to the MCDU 2 (3CA2)

 - wiring of the FMGC HLTY discrete from the FMGC 2 (1CA2) to the MCDU 2 (3CA2)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 22-70-00-710-001 Operational Test of the Multipurpose Control and
 Display Unit (MCDU)
 AMM 22-82-12-000-001 Removal of the MCDU (3CA1,3CA2,3CA3)
 AMM 22-82-12-400-002 Installation of the MCDU (3CA1,3CA2,3CA3)
 AMM 22-83-34-000-001 Removal of the FMGC (1CA1,1CA2)
 AMM 22-83-34-400-001 Installation of the FMGC (1CA1,1CA2)
 ASM 22-85/04
 ASM 22-86/04

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the Multipurpose Control and Display Unit (MCDU 2) (Ref. AMM TASK 22-70-00-710-001).
 4. Fault Isolation
_______________
 A. If the A/C status page does not come into view:
 - replace the FMGC-2 (1CA2) (Ref. AMM TASK 22-83-34-000-001) and (Ref. AMM TASK 22-83-34-400-001).
 (1) If the fault continues:

 - replace the MCDU-2 (3CA2) (Ref. AMM TASK 22-82-12-000-001) and (Ref. AMM TASK 22-82-12-400-002).

 (2) If the fault continues:

 - do a check of the wiring of the MCDU OWN OUT bus from the FMGC 2 (1CA2) to the MCDU 2 (3CA2) (Ref. ASM 22-86/04).
 (a) If there is no continuity:
 - repair the above wiring.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞22-82-00∞∞∞∞∞∞∞∞∞∞Page 217
 Feb 01/98 CES (b) If there is continuity:

 - do a check and repair the wiring of the FMGC HLTY discrete from the FMGC 2 (1CA2) to the MCDU 2 (3CA2) (Ref. ASM 22-85/04).
 B. Do the test given in Para. 3.

 Automatic Switching of the MCDU 1 Inoperative
 1. Possible Causes
_______________
 - FMGC-2 (1CA2)

 - MCDU-1 (3CA1)

 - wiring of the MCDU OPP OUT bus from the FMGC 2 (1CA2) to the MCDU 1 (3CA1)
　
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