Installation of the Multipurpose Control & Display Unit (MCDU)

TASK 22-82-12-400-002-A
Installation of the Multipurpose Control & Display Unit (MCDU)

ZONE: 210
FIN: 3CA1
FIN: 3CA2
FIN: 3CA3 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD

B. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
5	COVER	AIPC 22-84-08-05-050
5	CAP	AIPC 22-84-08-05-060
5	COVER	AIPC 22-84-88-05-050

C. Referenced Information

REFERENCE	DESIGNATION
TASK 22-70-00-710-001-A	Operational Test of the Multipurpose Control & Display Unit (MCDU)
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
MCDU ** ON A/C NOT FOR ALL
MCDU ** ON A/C NOT FOR ALL
MCDU ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 22-82-12-860-053-A

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).

Subtask 22-82-12-865-055-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	LIGHTING/INSTL LT/MAIN INST/PNL AND/PED	4LF	Y04
** ON A/C NOT FOR ALL
FOR FIN: 3CA1 (MCDU1)
49VU	AUTO FLT/MCDU/1	11CA1	B01
** ON A/C NOT FOR ALL
49VU	AUTO FLT/MCDU/1	11CA1	H07
** ON A/C ALL
FOR FIN: 3CA2 (MCDU2)
121VU	AUTO FLT/MCDU/2	11CA2	N20

4. Procedure
Subtask 22-82-12-420-053-B ** ON A/C NOT FOR ALL

A. Installation of the MCDU

NOTE: This procedure is applicable to each MCDU.

(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the CAP-BLANKING from each electrical connector and receptacle.
(4) Make sure that the electrical connector (4) is clean and in the correct condition.

CAUTION: IF YOU REMOVED THE TWO MCDU'S (1 AND 2), BE CAREFUL TO CONNECT EACH CONNECTOR (3CA1A AND 3CA2A) TO THE CORRECT MCDU. THIS WILL PREVENT CROSS-CONNECTION OF THE MCDU'S.

(5) Connect the electrical connector (4) to receptacle J1 (3). Make sure that the electrical connector (4) is connected to the correct MCDU (2).

NOTE: The MCDU (2) has two receptacles.

(6) Make sure that the cap (5) is installed on receptacle J2. If necessary:
(a) Install a new AIPC 22-84-08-05-060 CAP (5) on receptacle J2.
(b) Remove and discard the small chain attached to the cap (5).
(7) Install the MCDU (2) in its housing.
(8) Tighten the Dzus fasteners (1) by a quarter turn.

Subtask 22-82-12-420-053-C ** ON A/C NOT FOR ALL

A. Installation of the MCDU

NOTE: This procedure is applicable to each MCDU.

CAUTION: IF YOU REMOVED THE TWO MCDU'S (1 AND 2), BE CAREFUL TO CONNECT EACH CONNECTOR (3CA1A AND 3CA2A) TO THE CORRECT MCDU. THIS WILL PREVENT CROSS-CONNECTION OF THE MCDU'S.

(5) Connect the electrical connectors (4) to receptacles J1 and J2 (3). Make sure that the electrical connectors (4) are connected to the correct MCDU (2).
(6) Install the MCDU (2) in its housing.
(7) Tighten the Dzus fasteners (1) by a quarter turn.

Subtask 22-82-12-420-053-G ** ON A/C NOT FOR ALL

A. Installation of the MCDU

NOTE: This procedure is applicable to each MCDU.

CAUTION: IF YOU REMOVED THE TWO MCDU'S (1 AND 2), BE CAREFUL TO CONNECT EACH CONNECTOR (3CA1A AND 3CA2A) TO THE CORRECT MCDU. THIS WILL PREVENT CROSS-CONNECTION OF THE MCDU'S.

(5) Connect the electrical connectors (4) to receptacles J1 and J2 (3). Make sure that the electrical connectors (4) are connected to the correct MCDU (2).

NOTE: The MCDU (2) has three receptacles.

(6) Make sure that the cover (5) is installed on receptacle J3. If necessary:
(a) Install a new AIPC 22-84-08-05-050 COVER (5) or AIPC 22-84-88-05-050 COVER (5) on receptacle J3.
(b) Remove and discard the small chain attached to the cover (5).
(7) Install the MCDU (2) in its housing.
(8) Tighten the Dzus fasteners (1) by a quarter turn.

Subtask 22-82-12-865-056-A

CAUTION: IF YOU REMOVED THE TWO MCDU'S (1 AND 2), MAKE SURE THAT:

WHEN YOU CLOSE CIRCUIT BREAKER 11CA1, POWER IS SUPPLIED TO MCDU 1
WHEN YOU CLOSE CIRCUIT BREAKER 11CA2, POWER IS SUPPLIED TO MCDU 2.

THIS IS A CHECK TO MAKE SURE THAT THERE IS NO CROSS-CONNECTION OF THE ELECTRICAL CONNECTORS.

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	LIGHTING/INSTL LT/MAIN INST/PNL AND/PED	4LF	Y04
** ON A/C NOT FOR ALL
FOR FIN: 3CA1 (MCDU1)
49VU	AUTO FLT/MCDU/1	11CA1	B01
** ON A/C NOT FOR ALL
49VU	AUTO FLT/MCDU/1	11CA1	H07
** ON A/C ALL
FOR FIN: 3CA2 (MCDU2)
121VU	AUTO FLT/MCDU/2	11CA2	N20

Subtask 22-82-12-710-053-A

C. Do the operational test of the system (Ref. AMM TASK 22-70-00-710-001).

5. Close-up
Subtask 22-82-12-860-050-A

A. Aircraft Maintenance Configuration
(1) Make sure that the work area is clean and clear of tools and other items.
(2) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.01 04:38:11 UTC