Installation of the CSM/G Control Unit

TASK 24-24-34-400-001-A
Installation of the CSM/G Control Unit

ZONE: 125
FIN: 1XE

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
125	LATERAL AVIONIC COMPARTMENT
812, 822

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-24-00-710-001-A	Operational Check of Emergency Generating System
TASK 24-24-00-710-002-A	Operational Test of the Emergency Generator Control Unit (GCU) through Centralized Fault Display System (CFDS)
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
CSM/G Control Unit

3. Job Set-up
Subtask 24-24-34-860-052-A

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the WARNING NOTICE(S) is in the cockpit, on the EMER ELEC PWR section of the overhead panel 21VU, to tell persons not to operate the pushbutton switches.
(3) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position at the access doors 812 and 822 of the avionics compartment.
(4) Make sure that the access doors 812 and 822 are open.

Subtask 24-24-34-865-051-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
105VU	ELEC/CSM/G /EV AUTO/SPLY	7XE	C01
106VU	CSM/G /EV/MAN/SPLY	6XE	B04

4. Procedure
Subtask 24-24-34-420-050-A

A. Installation of the GCU
(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 all the electrical connections are clean and in the correct condition.
(5) Put the CSM/G control unit (1) in position.
(6) Install the washers (2) and the screws (3) and then tighten the screws.
(7) Connect the electrical connector (4).

Subtask 24-24-34-865-052-A

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
105VU	ELEC/CSM/G /EV AUTO/SPLY	7XE	C01
106VU	CSM/G /EV/MAN/SPLY	6XE	B04

Subtask 24-24-34-710-050-A

C. Operational test
(1) Do an operational test of the emergency GCU, with the CFDS (Ref. AMM TASK 24-24-00-710-002).

NOTE: As an alternative procedure, do this operational test without the CFDS.

(2) Do an operational test of the emergency GCU without the CFDS (Ref. AMM TASK 24-24-00-710-001).

5. Close-up
Subtask 24-24-34-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access doors 812 and 822.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).

Subtask 24-24-34-860-051-A

B. Put the aircraft back to its initial configuration.
(1) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.03.31 23:22:39 UTC