-
When a system has been called, WAIT FOR SYSTEM RESPONSE is displayed.

 -If the called system does not answer, PRESS MCDU MENU KEY is displayed.
R (i) The currently active system is displayed in green, remaining systems are displayed in white. When one system is selected (line select key has been pressed) only this line is displayed in cyan with WAIT FOR SYSTEM RESPONSE in the scratchpad.
 B. Switching Logic (FM only) (Ref. Fig. 008) Each MCDU receives the state of its own FMGC on the discrete FMGC healthy. When there is no failure (discrete in ground state), each MCDU talks to its own FMGC both ways. When one FMGC is failed discrete open, both MCDUs talk with the remaining FMGC and the OPP FMGC IN PROCESS indication is displayed in the scratchpad (on the MCDU which switched). The functioning of both MCDUs remains totally independent as if both FMGCs were valid. In particular each MCDU can talk with any system the operator has selected on the MCDU MENU page. As soon as the failed FMGC is no more failed, the MCDU reverts to talk with it.
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 MCDU Switching Logic
 Figure 008
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 CONTROL AND DISPLAY UNIT - MULTIPURPOSE (MCDU) (3CA1,3CA2,3CA3)
_______________________________________________________________ REMOVAL/INSTALLATION
____________________
 TASK 22-82-12-000-001
 Removal of the MCDU (3CA1,3CA2,3CA3)
 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific blanking caps
 No specific circuit breaker(s) safety clip(s)

 B. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
22-82-12-991-001 Fig. 401
 3. Job Set-up
__________
 Subtask 22-82-12-865-050

 A. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------
R 122VU LIGHTING/INSTL LT/MAIN INST/PNL AND/PED 4LF Y04 FOR 3CA1 49VU AUTO FLT/MCDU/1 11CA1 B01 FOR 3CA2 121VU AUTO FLT/MCDU/2 11CA2 N20 FOR 3CA3
 C/B NOT APPLICABLE
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 4. Procedure
_________

 (Ref. Fig. 401/TASK 22-82-12-991-001) Subtask 22-82-12-020-051
 A. Removal of the MCDU
 NOTE : This removal procedure is applicable to each MCDU.

____
 (1)
 Loosen the six Dzus fasteners (1) from the MCDU (2) by a quarter turn.

 (2)
 Pull the MCDU (2) from its housing.

 (3)
 Disconnect the electrical connector (4).

 (4)
 Remove the MCDU.

 (5)
 Put blanking caps on the disconnected electrical connectors (3) and (4).

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 Multipurpose Control and Display Unit (MCDU)
 Figure 401/TASK 22-82-12-991-001
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 TASK 22-82-12-400-002

 Installation of the MCDU (3CA1,3CA2,3CA3)
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
22-70-00-710-001 Operational Test of the Multipurpose Control and
 Display Unit (MCDU) 22-82-12-991-001 Fig. 401
 3. Job Set-up
__________
 Subtask 22-82-12-865-055
 A. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
　
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