Installation of the Current Transformers

TASK 24-22-17-400-003-A
Installation of the Current Transformers

WARNING: MAKE SURE THAT NO AC OR DC POWER IS CONNECTED TO THE AIRCRAFT ELECTRICAL CIRCUITS. THERE IS A RISK OF ELECTROCUTION IF THE AC OR DC POWER STAYS CONNECTED.

FIN: 51XU1 ** ON A/C NOT FOR ALL
FIN: 51XU2 ** ON A/C NOT FOR ALL

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 1M (3 FT)-ADJUSTABLE
No specific	AR	TIE WRAP
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.122 and 0.098 m.daN (10.80 and 8.67 lbf.in )
No specific	Torque wrench: range to between 1.1 and 0.90 m.daN (97.35 and 79.65 lbf.in )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121AL, 822

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-740-002-B	Operational Check of the GAPCU via the CFDS
TASK 24-41-00-740-004-A	Operational Check of the GPCU via the CFDS
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 25-11-41-000-001-A	Removal of the Third Occupant Seat
TASK 25-11-41-400-001-A	Installation of the Third Occupant Seat
AC Current Transformer (51XU1, 51XU2)

3. Job Set-up
Subtask 24-22-17-010-061-A ** ON A/C NOT FOR ALL

A. Get Access
(1) Make sure that the third occupant seat is removed (Ref. AMM TASK 25-11-41-000-001).
(2) On the left lower side of rear panel 120VU, make sure that the access panel (4) is removed.
(3) Make sure that the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE is in position at the access doors 822 and 121AL.
(4) Make sure that the access doors 822 and 121AL are open.

Subtask 24-22-17-860-067-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the external power connector is not connected to the aircraft external power receptacle.
(2) Make sure that a WARNING NOTICE(S) is (are) in position on the access door 121AL to tell persons not to connect the external power connector to the aircraft external power receptacle.
(3) In the cockpit, on the ELEC panel 35VU, make sure that these pushbutton switches are released:

BAT1, BAT2,
APU GEN,
GEN1, GEN2,
EXT PWR.

(4) In the cockpit, make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to operate the pushbutton switches on these overhead panels:

21VU (EMER ELEC PWR section),
25VU (APU section),
35VU (ELEC).

4. Procedure
Subtask 24-22-17-420-056-A ** ON A/C NOT FOR ALL

A. Installation of the Current Transformer
(1) Put the disconnect cables through the current transformer (1).

NOTE: Make sure that the location and the color of the cables of each bundle agree with those you recorded at the removal.

(2) Move the current transformer (1) along the cable bundles.
(3) Install the two screws (2) and nuts (5) on the current transformer (1) and tighten them.
(4) Remove the blanking caps from the electrical connector (3).
(5) Make sure that the electrical connector (3) is clean and in the correct condition.
(6) Connect the electrical connector (3) to the current transformer (1).
(7) Install new TIE WRAP.
(8) Make sure that the three electrical cables (6) is clean and in the correct position.
(9) Connect the three electrical cables (6) to the generator 1(2) contactor-module.
(a) Install the three washers (7) and nuts (8) and tighten them.
(b) TORQUE the nut (8) to between 1.1 and 0.90 m.daN (97.35 and 79.65 lbf.in )

.
(10) Make sure that the three electrical wires (9) is clean and in the correct position.
(11) Connect the three electrical wires (9).
(a) Install the three washers (10) and screws (11) and tighten them.
(b) TORQUE the screws (11) to between 0.122 and 0.098 m.daN (10.80 and 8.67 lbf.in )

Subtask 24-22-17-860-068-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits from engine 1(2) (Ref. AMM TASK 24-41-00-861-002).

Subtask 24-22-17-865-053-A ** ON A/C NOT FOR ALL

C. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
122VU	ELEC/GALLEY/CNTOR	7MC	S28
122VU	ELEC/GALY & CAB/CTL	1XA	S26
123VU	FWD GALLEY/FEEDER F	16MC	AC10
123VU	AFT GALLEY/FEEDER E	14MC	AF09
** ON A/C NOT FOR ALL
123VU	AFT GALLEY/FEEDER A	3MC	AF04
** ON A/C NOT FOR ALL
123VU	AFT GALLEY/FEEDER B	12MC	AD09
123VU	FWD GALLEY/FEEDER D	2MC	AD04
123VU	FWD GALLEY/FEEDER C	1MC	AE10
** ON A/C NOT FOR ALL
123VU	FWD GALLEY/FEEDER D	2MC	AE02

Subtask 24-22-17-710-055-A ** ON A/C NOT FOR ALL

D. Operational test
(1) Do the operational test that follows:

ACTION	RESULT
1.On the ECAM control panel: Push the ELEC key to get the "ELEC" page.	On the lower ECAM display unit: The "ELEC" page comes into view.
2.On ELEC panel 35VU: Push the GALY & CAB pushbutton switch.	On ELEC panel 35VU: The OFF legend of the GALY & CAB pushbutton switch goes off.
3.In the FWD and/or AFT galleys: Energize all the items of equipment.	On the lower ECAM display unit: Make sure that the electrical parameters (load, voltage and frequency) of IDG1(2) are correct.
4.On the MCDU: Do the operational check of the GPCU with the CFDS (Ref. AMM TASK 24-41-00-740-004).	On the MCDU, on the "AC GEN" page: The "TEST OK" message comes into view for some seconds.

Subtask 24-22-17-710-055-B ** ON A/C NOT FOR ALL

D. Operational test
(1) Do the operational test that follows:

ACTION	RESULT
1.On the ECAM control panel: Push the ELEC key to get the "ELEC" page.	On the lower ECAM display unit: The "ELEC" page comes into view.
2.On ELEC panel 35VU: Push the GALY & CAB pushbutton switch.	On ELEC panel 35VU: The OFF legend of the GALY & CAB pushbutton switch goes off.
3.In the FWD and/or AFT galleys: Energize all the items of equipment.	On the lower ECAM display unit: Make sure that the electrical parameters (load, voltage and frequency) of IDG1(2) are correct.
4.On the MCDU: Do the operational check of the GAPCU with the CFDS (Ref. AMM TASK 24-41-00-740-002).	On the MCDU, on the "AC GEN" page: The "TEST OK" message comes into view for some seconds.

Subtask 24-22-17-860-069-A ** ON A/C NOT FOR ALL

E. Aircraft Maintenance Configuration
(1) De-energize the aircraft electrical circuits supplied from engine 1(2) (Ref. AMM TASK 24-41-00-862-002).

5. Close-up
Subtask 24-22-17-410-056-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(3) Install the access panel (4) on the rear panel 120VU.
(4) Install the third occupant seat (Ref. AMM TASK 25-11-41-400-001).
(5) Close the access door 822 and 121AL.
(6) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:22:03 UTC